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POZ. 1. BELKA. |
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1.1). Zestawienie obciążeń. |
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1.1.1). Obciążenia stałe. |
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parkiet 2,5cm |
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warstwa wyr. 3cm |
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wełna min. 4 cm |
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strop DZ-3 |
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tynk c-w 1,5cm |
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gk [kN/m2] |
gf |
go [kN/m2] |
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Parkiet jesionowy 0,025 * 8,1 |
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0,203 |
1,2 |
0,243 |
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Warstwa wyrównawcza |
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0,500 |
1,3 |
0,650 |
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o grub. 2cm 0,02 * 25 |
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Wełna mineralna 0,04 * 2,0 |
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0,080 |
1,3 |
0,104 |
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Strop DZ-3 o wys. 23cm |
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2,650 |
1,1 |
2,915 |
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Tynk o grubości 15 cm |
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0,375 |
1,3 |
0,488 |
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0,015*25 |
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S= |
3,808 |
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4,400 |
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1.1.2). Obciążenia zmienne. |
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pk [kN/m2] |
gf |
po [kN/m2] |
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Obciążenia technologiczne |
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1,50 kN/m2 |
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1,5 |
1,3 |
1,95 |
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Obciążenia zastępcze od ścianek |
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działowych. |
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1,604 |
1,1 |
1,76 |
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S= |
3,104 |
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3,714 |
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lS= |
0,61 |
m |
Osiowy rozstaw żeber stropu DZ-3 |
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Ciężar ścianki działowej Q (płyta gips.-welna mineralna-płyta gips.): |
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Q = ( 0,02*12 ) *2+ ( 0,05*1,0 ) = |
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0,53 |
kN/m2 < 2,5kN/m2 |
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hs = |
3,4 m >2,65m |
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Obciążenie zastępcze wynosi: 1,25*3,4/2,65 m = |
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Renata Koczan:
wstawiłem 3,4 jako wys. Kondygn. (3,6-wysokość strpu =0,23m i zaokr.=3,4
1,60 |
kN/m2 |
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Przyjęto obciążenie zastępcze dla ścian działowych o ciężarze |
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właściwym mniejszym od 2,5kN/m2. |
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Dla ściany o wys.hs>2,65 obc.zastępcze ustalono proporcjonalnie |
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wg zależności hs/2,65=x/1,25 i dla hs=3,4m wynosi 1,60kN/m2 |
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1.1.3.).Obciążenia całkowite. |
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gk = |
gk + pk |
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gk = |
(3,88 + 3,10)kN/m2 = |
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6,911 |
kN/m2 |
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go = |
go + po |
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go = |
(4,40+4,195)kN/m2= |
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8,114 |
kN/m2 |
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1.1.4.) Obciążenie belki stropowej: |
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gk= |
gk*0,61 |
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gk= |
3,808 |
kN/m2 |
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gk= |
2,323 |
kN/mb |
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go= |
4,400 |
kN/m2 |
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go= |
go*0,61 |
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pk= |
3,104 |
kN/m2 |
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go= |
2,684 |
kN/mb |
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po= |
3,714 |
kN/m2 |
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pk= |
pk*0,61 |
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pk= |
1,893 |
kN/mb |
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po= |
po*0,61 |
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po= |
2,266 |
kN/mb |
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1.1.5. Zestawienie obciążenia montażowego |
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OBCIĄŻENIE |
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gmk |
gf |
gmo |
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[kN/m2] |
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[kN/m2] |
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ciężar stropu |
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2,650 |
1,1 |
2,915 |
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obciążenie montaż. |
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1,000 |
1,4 |
1,400 |
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Razem: |
3,650 |
Razem: |
4,315 |
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1.1.4.) Obciążenie belki stropowej: |
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gmk= |
gk*0,61 |
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gmk= |
3,650 |
kN/m2 |
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gmk= |
2,227 |
kN/mb |
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gmo= |
4,315 |
kN/m2 |
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gmo= |
go*0,61 |
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gmo= |
2,632 |
kN/mb |
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1.3) Schemat statyczny. |
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Obciążenie stałe |
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go= |
2,684 |
kN/mb |
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Obciążenie zmienne |
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po= |
2,266 |
kN/mb |
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go |
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L1= |
5,10 |
m |
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5100,00 |
mm |
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5,10 |
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2,70 |
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5,10 |
5,10 |
L2= |
2,70 |
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L2= |
2700,00 |
mm |
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Na podstawie "Poradnika Inżyniera i technika budowlanego" traktuję żeberko jako belkę wolnopodpartą, |
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oraz dobieram długości modularne żeberek. |
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qo+go |
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5,10 |
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M=ql2/8 |
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M=ql2/8 |
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Q=ql/2 |
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Q=ql/2 |
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Q=ql/2 |
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Mmax= |
16,091 |
kNm |
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Mmax= |
4,510 |
kNm |
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Q= |
12,621 |
kN |
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Q= |
6,682 |
kN |
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1.4 Wymiarowanie zbrojenia dla belki o długości 5,10m. |
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Materiały: |
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Beton: B 20 |
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fcd= |
10,6 |
MPa |
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EC= |
27,5 |
kN/mm2 |
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Stal A III |
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fyd= |
350 |
MPa |
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Es= |
200 |
kN/mm2 |
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Rozpietość stropu w osiach modularnych: |
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lm= |
5,1 |
m |
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Rozpietość stropu w swietle podpór: |
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ln= |
4,69 |
m |
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a1= |
15,0 |
cm |
podparcie na podporze. |
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Rozpietość efektywna przęsła: |
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leff= |
5,0 |
m |
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1.4.1)Schemat belki. |
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A
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B
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B
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1.4.2.)Efektywna szerokość współpracująca. |
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beff= |
bw+l0/5<=b=0,61m |
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beff= |
Renata Koczan:
lo potraktowałem jako l=0,85*5,1
praszczam sprawę
97,7 |
mm=0,97m>0,61m |
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beff= |
610 |
mm |
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bw= |
110,0 |
mm |
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b= |
610,0 |
mm |
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h= |
230,0 |
mm |
wysokośc stropu łacznie z nadbetonem |
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d= |
200,0 |
mm |
wysokośc użyteczna stropu |
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.1.4.3.) Nośność przekroju na zginanie. |
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1.4.3.1.) Sprawdzenie typu przekroju. |
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Msd= |
16,091 |
kNm = |
16091499,6541274 |
Nmm |
d= |
200,00 |
mm |
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Mht=a*fcd*beff*hf*(d-0,5hf) |
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hf= |
30,00 |
mm |
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Mht= |
30503355 |
Nmm |
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beff= |
610,0 |
mm |
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Mht= |
30,503 |
kNm |
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fcd= |
10,60 |
N/mm2 |
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a= |
0,85 |
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Msd= |
16,091 |
kNm<Mht= |
30,503 |
kNm - Przekroj pozornie teowy. |
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1.4.4.) Obliczenie nośności przekroju 1-1. |
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Sb= |
Msd/(a*fcd*beff*d2) |
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Msd= |
16,09 |
kNm |
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Sb= |
0,073 |
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beff= |
610,00 |
mm |
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Stąd x= |
1-(1-2*sb)1/2 |
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fcd= |
10,60 |
N/mm2 |
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Stąd x= |
0,076 |
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a= |
0,85 |
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Stal klasy III --- fyd= |
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350,0 |
N/m2 |
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d= |
200,00 |
mm |
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z= |
sb/x |
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fyd= |
350,00 |
N/mm2 |
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z= |
0,962 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
238,970 |
mm2 |
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Przyjęto zbrojenie 2f10 i 1f12o As1= |
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271,0 |
mm2 |
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Mogę zmniejszyć ilość zbrojenia traktując żebro jako utwierdzone,lecz idę w stronę bezpieczną. |
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Górą pręt montażowy f 6,0 (tablice w poradniku). |
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1.4.6.) Zbrojenie na ścinanie: |
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a= |
45 Stąd |
ctga=1 |
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O= |
44 59' 59'' |
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leff= |
4,99 |
m |
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L1= |
5,100 |
m |
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VsdA= |
12,621 |
kN |
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q0= |
4,949 |
kN/m |
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VsdAkr= |
VsdA-qo*ai |
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ai= |
0,150 |
m |
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VsdAkr= |
11,878 |
kN |
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ai= |
150,0 |
mm |
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Wspólczynnik efktywności: |
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n= |
0,7-fck/200>=0,5 |
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B20 Stąd fck= |
16,0 |
N/mm2 |
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n= |
0,62 |
>0,5 |
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d= |
0,200 |
m |
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k= 1,6-d |
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As1= |
271,0 |
mm2 |
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k= |
1,60 |
>1 |
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bw= |
110,0 |
mm |
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rL= |
As1/bw*d |
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d= |
200,0 |
mm |
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rL= |
0,0123 |
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Nośnośc przekroju bez zbrojenia. |
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VRd1= |
(k*trd(1,2+4,0*rL))*bw*d |
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trd= |
0,22 |
N/mm2 |
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VRd1= |
9673,16 |
N |
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rL= |
0,0123 |
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VRd1= |
9,67 |
kN |
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k= |
1,60 |
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VRd1= |
9,67 |
kN<VsdAkr= |
11,878 |
kN |
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d= |
200,0 |
mm |
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bw= |
110,0 |
mm |
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Nośnośc przekroju zbrojonego strzemionami. |
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n= |
0,62 |
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bw= |
110,0 |
mm |
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VRd2= |
bw*z*g*fcd/(cotO+tgO) |
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d= |
200,0 |
mm |
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VRd2= |
65,06 |
kN |
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fcd= |
10,60 |
N/mm2 |
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z=0,9*d= |
180,0 |
mm |
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O= |
44 59' 59'' |
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Rozstaw srzemion na odcinku wymagajacym zbrojenia na ścinanie: |
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Przyjęto strzemiona dwucięte ze stali A-I dla której fywd = |
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210 |
N/mm |
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c= |
(VsdAkr-VRd1)/q |
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f 4,5 o Asw= |
32,00 |
mm2 |
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z= |
180,00 |
mm |
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c= |
446 |
mm |
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VsdAkr= |
11,88 |
kN |
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c<3*d= |
600,0 |
mm |
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cotO= |
1,00 |
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Warunek spełniony. |
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VRd1= |
9,67 |
kN |
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q= |
4,949 |
kN/m |
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Odcinka c nie trzeba dzielić na mniejsze części |
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d= |
200,0 |
mm |
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Przyjęto że ścinanie zostanie przeniesione na c przez strzemiona pionowe. |
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Liczę łączną powierzchnie stali potrzebna do przeniesienia ścinania. |
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Asw= |
c*VsdAkr/z*fywd*cot(O) |
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VsdAkr= |
11878 |
N |
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Asw= |
140,014 |
mm2 |
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Asw1= |
32 |
mm2 |
Pole pow. jednego strzemiona dwucietego o4,5 |
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n= |
Asw/Asw1 |
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n= |
4,38 |
szt. |
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Przyjęto 5 szt. |
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Siła przenoszona przez strzemiona pionowe. |
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VsdAkr= |
11,878 |
kN |
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Vsds= |
(5*Asw1*z*fywd* cot(O))/C |
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Asw1= |
32 |
mm2 |
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Vsds= |
13573,90 |
N |
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z= |
180,00 |
mm |
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Vsds= |
13,57 |
kN |
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fywd= |
210 |
N/mm |
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VRd3= |
Vsds>=Vsdakr |
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13,57 |
kN > |
11,88 |
kN |
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O.K. |
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s1= |
80 |
mm |
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Przyjmuję rozstaw co 80mm |
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bw= |
110,0 |
mm |
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Sprawdzenie warunku normowego: |
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Asw1= |
32,00 |
mm2 |
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Asw1*fywd/bw*s1<=0,5*n*fcd |
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fywd = |
210 |
N/mm |
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n= |
0,62 |
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0,764 |
<0,5*n*fcd= |
3,29 |
N/mm2 |
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fcd= |
10,60 |
N/mm2 |
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Warunek spelniony. |
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Na pozostałej długości rozstaw strzemion co 250 mm. |
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1.5.) Sprawdzenie SGU. |
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1.5.1.) Sprawdzenie zarysowań. |
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1.5.1.1.)Rysy prostopadłe. |
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Wk= b*srm*e sm |
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b= |
1,3 |
Wspólczynnik stosunku obliczeniowej szerokosci rysy do szer. |
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średniej. Dla zarys. wyw. przez opór stawiany odkształceniom |
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wymuszonych w przekrojach o najmniejszym wymiarze nie przekr. 300mm |
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Aceff= |
2,5*(h-d)*bw |
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h= |
230,00 |
mm |
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Aceff= |
8250,0 |
mm2 |
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d= |
200,00 |
mm |
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bw= |
110,0 |
mm |
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rr = |
As/Aceff |
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As= |
271,0 |
mm2 |
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rr = |
0,033 |
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Aceff= |
8250,0 |
mm2 |
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k1= |
0,8 |
pr.żebr. |
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srm= |
50+0,25*k1*k2*f/rr |
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k2= |
0,5 |
el. zgin. |
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srm= |
50,0 |
mm |
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f= |
10,00 |
mm |
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Wc= |
bw*h2/6 |
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h= |
230,00 |
mm |
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Wc= |
969833,3 |
mm3 |
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bw= |
110,00 |
mm |
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Mcr= |
fctm*Wc |
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fctm= |
1,90 |
N/mm2 |
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Mcr= |
1842683,33333333 |
Nmm |
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Wc= |
969833,3 |
mm3 |
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Mcr= |
1,84 |
kNm |
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ssr/ss= |
Mcr/Msd |
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Msd= |
16,09 |
kNm |
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ssr/ss= |
0,115 |
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Mcr= |
1,84 |
kNm |
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z= |
0,9 |
bo r< 0,5% |
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ss= |
Msd/(z*d*As) |
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As= |
271,0 |
mm2 |
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ss= |
329,879041700028 |
N/mm2 |
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d= |
200,00 |
mm |
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e sm= |
ss/Es*[1-b1*b2(ssr/ss)2] |
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b1= |
1,0 |
pr. gładkie |
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e sm= |
0,0009 |
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b2= |
0,5 |
obc. dług. |
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ss=fyd= |
350,00 |
N/mm2 |
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Es= |
205000 |
N/mm2 |
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Wk= b*srm*e sm |
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b= |
1,3 |
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Wk= |
0,055 |
mm |
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srm= |
50,0 |
mm |
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e sm= |
0,0009 |
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Wk= |
0,055 |
mm<Wlim= |
0,3mm |
Warunek sprawdzony. |
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1.5.1.1.)Rysy ukośne. |
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wk=4*t2*l/(rw*Es*fck) |
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Vsd=(2,323)*5,1/2 |
wojciech koczan:
tutaj 2,323 biorę mnożąc obciążenia stałe przez 0,61m i
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siła od komb. od obc. długotrwałych |
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Vsd= |
5,924 |
kN |
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t=Vsd/(bw*d) |
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t=5,924kN/(110mm*200mm) |
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t= |
0,27 |
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rw=rw1+rw2 |
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Suma stopni zbrojenia strzemionami i pr.odgietymi |
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rw1=Asw1/(bw*s) |
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rw1=32,0/(110*80) |
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rw1= |
0,004 |
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rw2=0 |
- belka nie jest zbrojona prętami odgiętymi |
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rw=rw1=0,004 > rwmin=0,0015 |
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l=1/3*(rw1/(b1*f1)+rw2/(b2*f2)) |
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l=1/(3*(0,004/(1,0*4,5)) |
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l= |
375,0000 |
mm |
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b1=1,0 -dla prętów gładkich |
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f1=4,5mm |
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wk=4*t2*l/(rw*Es*fck) |
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wk=4*0,272*375/(0,004*205000*16) |
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wk= |
0,008 |
mm<wklim=0,3mm |
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O.K. |
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1.5.3.)Sprawdzenie ugięcia. |
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a(oo,to)=ak*Msd*l2eff/B(oo,to) |
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Msk =(pk+gk)*leff2/8 |
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Msk = |
13,122 |
kNm |
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l= |
5,100 |
m |
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ak= |
5/48 = |
0,104 |
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pk= |
1,893 |
kN/mb |
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gk= |
2,323 |
kN/mb |
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leff= |
4,99 |
m |
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b1= |
1,0 |
pr. gładkie |
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b2= |
0,5 |
obc. dług. |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,115 |
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u= |
2*bw+2*h |
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h= |
230,00 |
mm |
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u= |
680 |
mm |
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bw= |
110,00 |
mm |
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Ac= |
bw*h |
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Ac= |
25300 |
mm2 |
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2*Ac/u= |
74,412 |
mm |
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F(oo,to)=3,03 |
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Ec,eff=Ecm/(1+F(oo,to)) |
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Ec,eff= |
6,82 |
kN/mm2 |
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Dla obciażenia dzałającego długotrwale |
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Dla przekroju niezarysowanego: |
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B20 - Ecm=27,5 kN/mm2 |
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beff= |
610,0 |
mm |
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ae=Es/Em |
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h= |
230,00 |
mm |
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ae= |
30,04 |
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bw= |
110,00 |
mm |
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B(oo,to)=Ec,eff*II |
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As1= |
271,0 |
mm2 |
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Ec,eff=Ecm |
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Ec,eff= |
6823,8 |
N/mm2 |
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Ec,eff=27,5 kN/mm2 |
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Es= |
205000 |
N/mm2 |
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ae=Es/Em |
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a= |
wojciech koczan:
grubość nadbetonu
30 |
mm |
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ae= |
30,04 |
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Obliczenie położenia osi obojętnej przekroju betonowego niezarysowanego |
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Sc= |
(h-ht)2*bw*0,5+ht*beff*(h-0,5*ht) |
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beff= |
610,0 |
mm |
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Sc= |
6134500 |
mm3 |
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h= |
230,0 |
mm |
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Sc= |
6134,5 |
cm3 |
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bw= |
110,0 |
mm |
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ht= |
30,00 |
mm |
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Ac= |
(h-ht)*bw+ht*beff |
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Ac= |
403,00 |
cm2 |
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x= |
Sc/Ac |
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x= |
15,22 |
cm |
Położenie osi przekroju betonowego. |
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II= |
((bw*ht3)/12)+ht*beff*(h-x-0,5*ht)2+((bw*(h-ht)3)/12)+bw*(h-ht)*(h-ht-x)2+ae*As1*(h-x-a)2 |
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II= |
17798,7714533472 |
cm4 |
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Moment bezwładności dla przekroju zarysowanego: |
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beff= |
610,0 |
mm |
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d= |
200,00 |
mm |
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h= |
230,0 |
mm |
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xeff= |
30,00 |
mm |
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bw= |
110,0 |
mm |
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ht= |
30,0 |
mm |
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III= |
((bw*xeff3)/12)+bw*xeff*(ht-xeff)2+ae*As1*(h-xeff-a)2 |
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As1= |
271,0 |
mm2 |
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a= |
wojciech koczan:
grubość otuliny
30 |
mm |
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III= |
23553,2015818182 |
cm4 |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,115 |
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bw= |
110,00 |
mm |
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h= |
230,00 |
mm |
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B(oo,to)= |
1621295361,92597 |
kN/mm2 |
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AsI= |
271,0 |
mm2 |
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Eceff= |
6,8 |
kN/mm2 |
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leff= |
4,99 |
m |
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a(oo,to)= |
ak*Msd*leff2/B(oo,to) |
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B(oo,to)= |
1621295361,92597 |
kN/mm2 |
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ak= |
0,104 |
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a(oo,to)= |
20,993 |
mm < alim= leff/200 = |
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24,95 |
mm |
Msd = |
13,122 |
kNm |
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20,993 |
mm< |
24,95 |
mm |
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Warunek nie został spełniony. |
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Na podstawie "Konstrukcji Żelbetowych " Kobiaka stosuję " żebra rozdzielcze w połowie rozpietości |
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belki stosując pręty f 12.Oraz nad podporami stosuje zbrojenie w nadbetonie z prętów f 12. |
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1.5 Wymiarowanie zbrojenia dla belki o długości 2,7m (nad korytarzem). |
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Materiały: |
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Beton: B 20 |
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fcd= |
10,6 |
MPa |
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EC= |
27,5 |
kN/mm2 |
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Stal A III |
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fyd= |
350 |
MPa |
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Es= |
200 |
kN/mm2 |
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Rozpietość stropu w osiach modularnych: |
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lm= |
2,7 |
m |
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Rozpietość stropu w swietle podpór: |
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ln= |
2,4 |
m |
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a1= |
13,0 |
cm |
podparcie na podporze. |
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Rozpietość efektywna przęsła: |
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leff= |
2,7 |
m |
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1.4.1)Schemat belki. |
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A
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B
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B
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2,7m |
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1.4.2.)Efektywna szerokość współpracująca. |
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beff= |
bw+l0/5<=b=0,61m |
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beff= |
Renata Koczan:
lo potraktowałem jako l=0,85*2,7
praszczam sprawę
56,9 |
mm=0,57m>0,61m |
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beff= |
570 |
mm |
Do obliczeń przyjmuję mniejsza wartość. |
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bw= |
110,0 |
mm |
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b= |
610,0 |
mm |
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h= |
230,0 |
mm |
wysokośc stropu łacznie z nadbetonem |
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d= |
200,0 |
mm |
wysokośc użyteczna stropu |
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.1.4.3.) Nośność przekroju na zginanie. |
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1.4.3.1.) Sprawdzenie typu przekroju. |
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Msd= |
4,510 |
kNm = |
4510074,29752359 |
Nmm |
d= |
200,00 |
mm |
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Mht=a*fcd*beff*hf*(d-0,5hf) |
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hf= |
30,00 |
mm |
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Mht= |
28503135 |
Nmm |
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beff= |
570,0 |
mm |
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Mht= |
28,503 |
kNm |
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fcd= |
10,60 |
N/mm2 |
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a= |
0,85 |
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Msd= |
4,510 |
kNm<Mht= |
28,503 |
kNm - Przekroj pozornie teowy. |
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1.4.4.) Obliczenie nośności przekroju 1-1. |
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Sb= |
Msd/(a*fcd*beff*d2) |
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Msd= |
4,51 |
kNm |
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Sb= |
0,022 |
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beff= |
570,00 |
mm |
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Stąd x= |
1-(1-2*sb)1/2 |
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fcd= |
10,60 |
N/mm2 |
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Stąd x= |
0,022 |
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a= |
0,85 |
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Stal klasy III --- fyd= |
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350,0 |
N/m2 |
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d= |
200,00 |
mm |
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z= |
sb/x |
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fyd= |
350,00 |
N/mm2 |
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z= |
0,989 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
65,153 |
mm2 |
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Przyjęto zbrojenie 3f6 o As1= |
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84,0 |
mm2 |
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Mogę zmniejszyć ilość zbrojenia traktując żebro jako utwierdzone,lecz idę w stronę bezpieczną. |
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Górą pręt montażowy f 4,5 (tablice w poradniku). |
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1.4.6.) Zbrojenie na ścinanie: |
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a= |
45 Stąd |
ctga=1 |
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O= |
44 59' 59'' |
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leff= |
2,66 |
m |
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L1= |
2,700 |
m |
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VsdA= |
6,682 |
kN |
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q0= |
4,949 |
kN/m |
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VsdAkr= |
VsdA-qo*ai |
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ai= |
0,150 |
m |
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VsdAkr= |
5,939 |
kN |
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ai= |
150,0 |
mm |
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Wspólczynnik efktywności: |
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n= |
0,7-fck/200>=0,5 |
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B20 Stąd fck= |
16,0 |
N/mm2 |
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n= |
0,62 |
>0,5 |
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d= |
0,200 |
m |
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k= 1,6-d |
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As1= |
84,0 |
mm2 |
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k= |
1,60 |
>1 |
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bw= |
110,0 |
mm |
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rL= |
As1/bw*d |
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d= |
200,0 |
mm |
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rL= |
0,0038 |
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Nośnośc przekroju bez zbrojenia. |
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VRd1= |
(k*trd(1,2+4,0*rL))*bw*d |
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trd= |
0,22 |
N/mm2 |
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VRd1= |
9409,90 |
N |
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rL= |
0,0038 |
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VRd1= |
9,41 |
kN |
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k= |
1,60 |
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VRd1= |
9,41 |
kN>VsdAkr= |
5,939 |
kN |
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d= |
200,0 |
mm |
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Nie trzeba zbroić na scinanie. |
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bw= |
110,0 |
mm |
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Nośnośc przekroju zbrojonego strzemionami. |
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Przyjęto strzemiona dwucięte ze stali A-I dla której fywd = |
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210 |
N/mm |
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f 4,5 o Asw= |
32,00 |
mm2 |
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Na podstawie "Poradnika Inż. I Techn. Bud." przyjmuję na całej długości belki min14 strzemion. |
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Rozstaw strzemion co 190mm. |
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1.5.) Sprawdzenie SGU. |
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1.5.1.) Sprawdzenie zarysowań. |
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1.5.1.1.)Rysy prostopadłe. |
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Wk= b*srm*e sm |
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b= |
1,3 |
Wspólczynnik stosunku obliczeniowej szerokosci rysy do szer. |
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średniej. Dla zarys. wyw. przez opór stawiany odkształceniom |
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wymuszonych w przekrojach o najmniejszym wymiarze nie przekr. 300mm |
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Aceff= |
2,5*(h-d)*bw |
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h= |
230,00 |
mm |
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Aceff= |
8250,0 |
mm2 |
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d= |
200,00 |
mm |
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bw= |
110,0 |
mm |
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rr = |
As/Aceff |
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As= |
84,0 |
mm2 |
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rr = |
0,010 |
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Aceff= |
8250,0 |
mm2 |
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k1= |
0,8 |
pr.żebr. |
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srm= |
50+0,25*k1*k2*f/rr |
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k2= |
0,5 |
el. zgin. |
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srm= |
50,0 |
mm |
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f= |
6,00 |
mm |
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Wc= |
bw*h2/6 |
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h= |
230,00 |
mm |
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Wc= |
969833,3 |
mm3 |
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bw= |
110,00 |
mm |
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Mcr= |
fctm*Wc |
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fctm= |
1,90 |
N/mm2 |
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Mcr= |
1842683,33333333 |
Nmm |
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Wc= |
969833,3 |
mm3 |
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Mcr= |
1,84 |
kNm |
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ssr/ss= |
Mcr/Msd |
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Msd= |
4,51 |
kNm |
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ssr/ss= |
0,409 |
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Mcr= |
1,84 |
kNm |
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z= |
0,9 |
bo r< 0,5% |
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ss= |
Msd/(z*d*As) |
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As= |
84,0 |
mm2 |
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ss= |
298,285337137803 |
N/mm2 |
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d= |
200,00 |
mm |
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e sm= |
ss/Es*[1-b1*b2(ssr/ss)2] |
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b1= |
1,0 |
pr. gładkie |
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e sm= |
0,0009 |
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b2= |
0,5 |
obc. dług. |
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ss=fyd= |
350,00 |
N/mm2 |
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Es= |
205000 |
N/mm2 |
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Wk= b*srm*e sm |
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b= |
1,3 |
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Wk= |
0,055 |
mm |
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srm= |
50,0 |
mm |
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e sm= |
0,0009 |
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Wk= |
0,055 |
mm<Wlim= |
0,3mm |
Warunek sprawdzony. |
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1.5.1.1.)Rysy ukośne. |
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wk=4*t2*l/(rw*Es*fck) |
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Vsd=2,323*2,7/2 |
wojciech koczan:
tutaj 2,323 biorę mnożąc obciążenia stałe przez 0,61m
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siła od komb. od obc. długotrwałych |
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Vsd= |
3,136 |
kN |
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t=Vsd/(bw*d) |
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t=3,136kN/(110mm*200mm) |
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t= |
0,14 |
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rw=rw1+rw2 |
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Suma stopni zbrojenia strzemionami i pr.odgietymi |
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rw1=Asw1/(bw*s) |
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rw1=32,0/(110*200) |
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rw1= |
0,002 |
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rw2=0 |
- belka nie jest zbrojona prętami odgiętymi |
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rw=rw1=0,002 > rwmin=0,0015 |
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l=1/(3*(rw1/(b1*f1)+rw2/(b2*f2))) |
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l=1/(3*(0,002/(1,0*4,5)) |
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l= |
375,0000 |
mm |
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b1=1,0 -dla prętów gładkich |
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f1=4,5mm |
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wk=4*t2*l/(rw*Es*fck) |
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wk=4*0,142*375/(0,002*205000*16) |
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wk= |
0,004 |
mm<wklim=0,3mm |
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O.K. |
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1.5.3.)Sprawdzenie ugięcia. |
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a(oo,to)=ak*Msd*l2eff/B(oo,to) |
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Msk =(pk+gk)*leff2 /8 |
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Msk = |
3,729 |
kNm |
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l= |
mm |
m |
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ak= |
5/48 = |
0,104 |
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pk= |
1,893 |
kN/mb |
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gk= |
2,323 |
kN/mb |
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leff= |
2,7 |
m |
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b1= |
1,0 |
pr. gładkie |
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b2= |
0,5 |
obc. dług. |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,409 |
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Ac= |
bw*h |
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h= |
230,00 |
mm |
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Ac= |
25300 |
mm2 |
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bw= |
110,00 |
mm |
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u= |
2*bw+2*h |
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u= |
680 |
mm |
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2*Ac/u= |
74,41 |
mm |
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F(oo,to)=3,03 |
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Ec,eff=Ecm/(1+F(oo,to)) |
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Ec,eff= |
6,82 |
kN/mm2 |
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Dla obciażenia dzałającego długotrwale |
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Dla przekroju niezarysowanego: |
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B20 - Ecm=27,5 kN/mm2 |
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beff= |
570,0 |
mm |
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ae=Es/Em |
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h= |
230,00 |
mm |
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ae= |
30,04 |
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bw= |
110,00 |
mm |
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B(oo,to)=Ec,eff*II |
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As1= |
84,0 |
mm2 |
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Ec,eff=Ecm |
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Ec,eff= |
6823,8 |
N/mm2 |
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Ec,eff=27,5 kN/mm2 |
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Es= |
205000 |
N/mm2 |
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ae=Es/Eceff |
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a= |
wojciech koczan:
grubość nadbetonu
30 |
mm |
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ae= |
30,04 |
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Obliczenie położenia osi obojętnej przekroju betonowego niezarysowanego |
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Sc= |
(h-ht)2*bw*0,5+ht*beff*(h-0,5*ht) |
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beff= |
570,0 |
mm |
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Sc= |
5876500 |
mm3 |
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h= |
230,0 |
mm |
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Sc= |
5876,5 |
cm3 |
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bw= |
110,0 |
mm |
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ht= |
30,00 |
mm |
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Ac= |
(h-ht)*bw+ht*beff |
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Ac= |
391,00 |
cm2 |
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x= |
Sc/Ac |
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x= |
15,03 |
cm |
Położenie osi przekroju betonowego. |
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II= |
((bw*ht3)/12)+ht*beff*(h-x-0,5*ht)2+((bw*(h-ht)3)/12)+bw*(h-ht)*(h-ht-x)2+ae*As1*(h-x-a)2 |
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II= |
16623,4816638146 |
cm4 |
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Moment bezwładności dla przekroju zarysowanego: |
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beff= |
570,0 |
mm |
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d= |
200,00 |
mm |
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h= |
230,0 |
mm |
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xeff= |
30,00 |
mm |
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bw= |
110,0 |
mm |
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ht= |
30,0 |
mm |
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III= |
((bw*xeff3)/12)+bw*xeff*(ht-xeff)2+ae*As1*(h-xeff-a)2 |
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As1= |
84,0 |
mm2 |
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a= |
wojciech koczan:
grubość
otuliny
30 |
mm |
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III= |
7317,70178181818 |
cm4 |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,409 |
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bw= |
110,00 |
mm |
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h= |
230,00 |
mm |
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B(oo,to)= |
518393442,411546 |
kN/mm2 |
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AsI= |
84,0 |
mm2 |
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Eceff= |
6,8 |
kN/mm2 |
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leff= |
2,7 |
m |
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a(oo,to)= |
ak*Msd*leff2/B(oo,to) |
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B(oo,to)= |
518393442,411546 |
kN/mm2 |
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ak= |
0,104 |
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a(oo,to)= |
5,301 |
mm < alim= leff/200 = |
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13,3 |
mm |
Msd = |
3,729 |
kNm |
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5,301 |
mm< |
13,3 |
mm |
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Warunek został spełniony. |
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Na podstawie "Konstrukcji Żelbetowych " Kobiaka stosuję nad podporami stosuje zbrojenie |
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w nadbetonie z prętów f 12. |
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POZ.2 BELKA POD ŚCIANKĄ DZIAŁOWĄ |
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2.1..) Belka pod ścianką działową. |
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Zakładam że pod ścianką działową znajdują się dwie beleczki(żeberka) i pracuja |
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jako jedna belka. |
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gk [kN/m] |
gf |
go [kN/m] |
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Parkiet jesionowy( 0,025 * 8,1)*0,84 |
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0,148 |
1,2 |
0,177 |
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Warstwa wyrównawcza |
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0,365 |
1,3 |
0,475 |
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o grub. 2cm (0,02 * 25)*84 |
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Wełna mineralna 0,04 * 2,0*84 |
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0,058 |
1,3 |
0,076 |
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Strop DZ-3 o wys. 23cm |
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2,650 |
1,1 |
2,915 |
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Tynk o grubości 15 cm |
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0,274 |
1,3 |
0,356 |
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0,015*25*0,84 |
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Cięzar belki 0,2*0,24*25 |
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1,100 |
1,1 |
1,210 |
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Ciężar ściany |
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3,6*0,53 |
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1,908 |
1,1 |
2,099 |
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S= |
6,503 |
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7,307 |
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2.2.). Obciążenia zmienne. |
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pk [kN/m] |
gf |
po [kN/m] |
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Obciążenia technologiczne |
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1,50 kN/m2 |
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1,1 |
1,4 |
1,533 |
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S= |
1,095 |
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1,533 |
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2.3.).Obciążenia całkowite. |
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gk = |
gk + pk |
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gk = |
(6,5 + 1,1)kN/m = |
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7,598 |
kN/m |
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go = |
go + po |
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go = |
(7,307 + 1,53 )kN/m= |
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8,840 |
kN/m |
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Schemat statyczny. |
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Obciążenie stałe |
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qo= |
8,840 |
kN/mb |
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L1= |
5,10 |
m |
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5100,00 |
mm |
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5,10 |
|
2,70 |
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5,10 |
L2= |
2,70 |
m |
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L2= |
2700,00 |
mm |
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Na podstawie "Poradnika Inżyniera i technika budowlanego" traktuję żeberko jako belkę wolnopodpartą, |
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go |
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5,10 |
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M=ql2/8 |
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Q=ql/2 |
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Mmax= |
28,740 |
kNm |
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Q= |
22,542 |
kN |
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2.4 Wymiarowanie zbrojenia |
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Materiały: |
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Beton: B 20 |
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fcd= |
10,6 |
MPa |
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EC= |
27,5 |
kN/mm2 |
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Stal A III |
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fyd= |
350 |
MPa |
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Es= |
200 |
kN/mm2 |
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Rozpietość stropu w osiach modularnych: |
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lm= |
5,1 |
m |
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Rozpietość stropu w swietle podpór: |
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ln= |
4,69 |
m |
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a1= |
15,0 |
cm |
podparcie na podporze. |
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Rozpietość efektywna przęsła: |
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leff= |
5,0 |
m |
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2.4.1)Schemat belki. |
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A
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B
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B
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2.4.2.)Efektywna szerokość współpracująca. |
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beff= |
bw+l0/5<=b=0,61m |
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beff= |
Renata Koczan:
lo potraktowałem jako l=0,85*5,1
praszczam sprawę
108,7 |
mm=0,97m>0,61m |
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beff= |
730 |
mm |
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bw= |
220,0 |
mm |
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b= |
840,0 |
mm |
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h= |
230,0 |
mm |
wysokośc stropu łacznie z nadbetonem |
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d= |
200,0 |
mm |
wysokośc użyteczna stropu |
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2.4.3.) Nośność przekroju na zginanie. |
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2.4.3.1.) Sprawdzenie typu przekroju. |
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Msd= |
28,740 |
kNm = |
28740000 |
Nmm |
d= |
200,00 |
mm |
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Mht=a*fcd*beff*hf*(d-0,5hf) |
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hf= |
30,00 |
mm |
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Mht= |
42004620 |
Nmm |
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beff= |
840,0 |
mm |
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Mht= |
42,005 |
kNm |
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fcd= |
10,60 |
N/mm2 |
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a= |
0,85 |
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Msd= |
28,740 |
kNm<Mht= |
42,005 |
kNm |
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2.4.4.) Obliczenie nośności przekroju 1-1. |
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Sb= |
Msd/(a*fcd*beff*d2) |
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Msd= |
28,74 |
kNm |
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Sb= |
0,095 |
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beff= |
840,00 |
mm |
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Stąd x= |
1-(1-2*sb)1/2 |
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fcd= |
10,60 |
N/mm2 |
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Stąd x= |
0,100 |
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a= |
0,85 |
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Stal klasy III --- fyd= |
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350,0 |
N/m2 |
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d= |
200,00 |
mm |
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z= |
sb/x |
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fyd= |
350,00 |
N/mm2 |
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z= |
0,950 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
432,164 |
mm2 |
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Przyjęto zbrojenie 4f10 i 2f12o As1= |
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542,0 |
mm2 |
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Stosuję żeberka ze wcześniejszych obliczeń. |
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Górą pręty montażowe f 6,0 (tablice w poradniku). |
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2.4.6.) Zbrojenie na ścinanie: |
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a= |
45 Stąd |
ctga=1 |
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O= |
44 59' 59'' |
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leff= |
4,99 |
m |
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L1= |
5,100 |
m |
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VsdA= |
22,542 |
kN |
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q0= |
8,840 |
kN/m |
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VsdAkr= |
VsdA-qo*ai |
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ai= |
0,150 |
m |
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VsdAkr= |
21,216 |
kN |
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ai= |
150,0 |
mm |
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Wspólczynnik efktywności: |
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n= |
0,7-fck/200>=0,5 |
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B20 Stąd fck= |
16,0 |
N/mm2 |
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n= |
0,62 |
>0,5 |
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d= |
0,200 |
m |
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k= 1,6-d |
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As1= |
542,0 |
mm2 |
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k= |
1,60 |
>1 |
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bw= |
220,0 |
mm |
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rL= |
As1/bw*d |
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d= |
200,0 |
mm |
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rL= |
0,0123 |
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Nośnośc przekroju bez zbrojenia. |
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VRd1= |
(k*trd(1,2+4,0*rL))*bw*d |
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trd= |
0,22 |
N/mm2 |
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VRd1= |
19346,32 |
N |
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rL= |
0,0123 |
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VRd1= |
19,35 |
kN |
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k= |
1,60 |
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VRd1= |
19,35 |
kN<VsdAkr= |
21,216 |
kN |
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d= |
200,0 |
mm |
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bw= |
220,0 |
mm |
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Nośnośc przekroju zbrojonego strzemionami. |
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n= |
0,62 |
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bw= |
220,0 |
mm |
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VRd2= |
bw*z*g*fcd/(cotO+tgO) |
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d= |
200,0 |
mm |
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VRd2= |
10,43 |
kN |
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fcd= |
0,85 |
N/mm2 |
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z=0,9*d= |
180,0 |
mm |
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O= |
44 59' 59'' |
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Rozstaw srzemion na odcinku wymagajacym zbrojenia na ścinanie: |
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Przyjęto strzemiona dwucięte ze stali A-I dla której fywd = |
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210 |
N/mm |
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c= |
(VsdAkr-VRd1)/q |
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f 4,5 o Asw= |
32,00 |
mm2 |
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z= |
180,00 |
mm |
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c= |
211 |
mm |
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VsdAkr= |
21,22 |
kN |
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c<3*d= |
600,0 |
mm |
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cotO= |
1,00 |
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Warunek spełniony. |
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VRd1= |
19,35 |
kN |
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q= |
8,840 |
kN/m |
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Odcinka c nie trzeba dzielić na mniejsze części |
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d= |
200,0 |
mm |
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Przyjęto że ścinanie zostanie przeniesione na c przez strzemiona pionowe. |
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Liczę łączną powierzchnie stali potrzebna do przeniesienia ścinania. |
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Asw= |
c*VsdAkr/z*fywd*cot(O) |
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VsdAkr= |
21216 |
N |
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Asw= |
118,698 |
mm2 |
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Asw1= |
64 |
mm2 |
Pole pow. jednego strzemiona dwucietego o4,5 |
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pmnożone przez 2 (2 żeberka) |
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n= |
Asw/Asw1 |
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n= |
1,85 |
szt. |
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Przyjęto 2 szt. |
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Siła przenoszona przez strzemiona pionowe. |
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VsdAkr= |
21,216 |
kN |
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Vsds= |
(5*Asw1*z*fywd* cot(O))/C |
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Asw1= |
64 |
mm2 |
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Vsds= |
57196,16 |
N |
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z= |
180,00 |
mm |
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Vsds= |
57,20 |
kN |
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fywd= |
210 |
N/mm |
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VRd3= |
Vsds>=Vsdakr |
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57,20 |
kN > |
21,22 |
kN |
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O.K. |
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Przyjęto strzemiona dwucięte ze stali A-I dla której fywd = |
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210 |
N/mm |
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f 4,5 o Asw= |
32,00 |
mm2 |
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W zwiazku z tym że stosuje żeberka obliczone wczesniej zakładam identyczną ilości |
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i rozstaw strzemion. |
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Ponadto żeberka zostały rozsunięte, w związku z tym w powstałej belce między żebekami |
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zakładam pręty 3o8, oraz strzemiona o 4,5 co 300mm. |
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2.5.) Sprawdzenie SGU. |
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2.5.1.) Sprawdzenie zarysowań. |
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2.5.1.1.)Rysy prostopadłe. |
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Wk= b*srm*e sm |
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b= |
1,3 |
Wspólczynnik stosunku obliczeniowej szerokosci rysy do szer. |
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średniej. Dla zarys. wyw. przez opór stawiany odkształceniom |
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wymuszonych w przekrojach o najmniejszym wymiarze nie przekr. 300mm |
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Aceff= |
2,5*(h-d)*bw |
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h= |
230,00 |
mm |
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Aceff= |
16500,0 |
mm2 |
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d= |
200,00 |
mm |
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rr = |
As/Aceff |
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bw= |
220,0 |
mm |
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rr = |
0,033 |
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As= |
542,0 |
mm2 |
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Aceff= |
16500,0 |
mm2 |
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srm= |
50+0,25*k1*k2*f/rr |
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k1= |
0,8 |
pr.żebr. |
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srm= |
50,0 |
mm |
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k2= |
0,5 |
el. zgin. |
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f= |
10,00 |
mm |
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Wc= |
bw*h2/6 |
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Wc= |
1939666,66666667 |
mm3 |
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h= |
230,00 |
mm |
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bw= |
220,00 |
mm |
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Mcr= |
fctm*Wc |
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Mcr= |
3685366,66666667 |
Nmm |
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fctm= |
1,90 |
N/mm2 |
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Mcr= |
3,69 |
kNm |
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Wc= |
1939666,66666667 |
mm3 |
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ssr/ss= |
Mcr/Msd |
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Msd= |
28,74 |
kNm |
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ssr/ss= |
0,128 |
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Mcr= |
3,69 |
kNm |
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z= |
0,9 |
bo r< 0,5% |
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As= |
542,0 |
mm2 |
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d= |
200,00 |
mm |
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ss= |
Msd/(z*d*As) |
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ss= |
294,587945879459 |
N/mm2 |
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b1= |
1,0 |
pr. gładkie |
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b2= |
0,5 |
obc. dług. |
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e sm= |
ss/Es*[1-b1*b2(ssr/ss)2] |
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ss=fyd= |
350,00 |
N/mm2 |
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e sm= |
0,0009 |
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Es= |
205000 |
N/mm2 |
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b= |
1,3 |
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Wk= b*srm*e sm |
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srm= |
50,0 |
mm |
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Wk= |
0,055 |
mm |
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e sm= |
0,0009 |
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Wk= |
0,055 |
mm<Wlim= |
0,3mm |
Warunek sprawdzony. |
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2.5.1.1.)Rysy ukośne. |
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wk=4*t2*l/(rw*Es*fck) |
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Vsd=(6,503)*5,1/2 |
wojciech koczan:
tutaj 6,503 biorę z zestawienia
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siła od komb. od obc. długotrwałych |
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Vsd= |
16,583 |
kN |
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t=Vsd/(bw*d) |
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t=16,583kN/(220mm*200mm) |
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t= |
0,38 |
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rw=rw1+rw2 |
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Suma stopni zbrojenia strzemionami i pr.odgietymi |
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rw1=Asw1/(bw*s) |
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rw1=64/(220*80) |
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rw1= |
0,004 |
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rw2=0 |
- belka nie jest zbrojona prętami odgiętymi |
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rw=rw1=0,004 > rwmin=0,0015 |
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l=1/3*(rw1/(b1*f1)+rw2/(b2*f2)) |
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l=1/(3*(0,004/(1,0*4,5)) |
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l= |
375,0000 |
mm |
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b1=1,0 -dla prętów gładkich |
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f1=4,5mm |
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wk=4*t2*l/(rw*Es*fck) |
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wk=4*0,382*375/(0,004*205000*16) |
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wk= |
0,017 |
mm<wklim=0,3mm |
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O.K. |
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2.5.3.)Sprawdzenie ugięcia. |
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a(oo,to)=ak*Msd*l2eff/B(oo,to) |
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Msk =(pk+gk)*leff2/8 |
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Msk = |
23,649 |
kNm |
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l= |
5,100 |
m |
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ak= |
5/48 = |
0,104 |
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pk+gk= |
7,598 |
kN/mb |
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leff= |
4,99 |
m |
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b1= |
1,0 |
pr. gładkie |
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b2= |
0,5 |
obc. dług. |
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ssr/ss= |
Mcr /Msd= |
0,128 |
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Ac= |
bw*h |
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h= |
230,00 |
mm |
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Ac= |
50600 |
mm2 |
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bw= |
220,00 |
mm |
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u= |
2*bw+2*h |
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u= |
900 |
mm |
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2*Ac/u= |
112,44 |
mm |
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F(oo,to)=2,9 |
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Ec,eff=Ecm/(1+F(oo,to)) |
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Ec,eff= |
7,05 |
kN/mm2 |
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Dla obciażenia dzałającego długotrwale |
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Dla przekroju niezarysowanego: |
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B20 - Ecm=27,5 kN/mm2 |
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beff= |
840,0 |
mm |
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ae=Es/Ecm |
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h= |
230,00 |
mm |
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ae= |
29,07 |
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bw= |
220,00 |
mm |
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B(oo,to)=Ec,eff*II |
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As1= |
542,0 |
mm2 |
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Ec,eff=Ecm |
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Ec,eff= |
7051,3 |
N/mm2 |
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Ec,eff=27,5 kN/mm2 |
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Es= |
205000 |
N/mm2 |
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ae=Es/Eceff |
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a= |
wojciech koczan:
grubość nadbetonu
30 |
mm |
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ae= |
29,07 |
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Obliczenie położenia osi obojętnej przekroju betonowego niezarysowanego |
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Sc= |
(h-ht)2*bw*0,5+ht*beff*(h-0,5*ht) |
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beff= |
840,0 |
mm |
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Sc= |
9818000 |
mm3 |
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h= |
230,0 |
mm |
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Sc= |
9818 |
cm3 |
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bw= |
220,0 |
mm |
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ht= |
30,00 |
mm |
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Ac= |
(h-ht)*bw+ht*beff |
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Ac= |
692,00 |
cm2 |
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x= |
Sc/Ac |
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x= |
14,19 |
cm |
Położenie osi przekroju betonowego. |
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II= |
((bw*ht3)/12)+ht*beff*(h-x-0,5*ht)2+((bw*(h-ht)3)/12)+bw*(h-ht)*(h-ht-x)2+ae*As1*(h-x-a)2 |
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II= |
35539,8086004828 |
cm4 |
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Moment bezwładności dla przekroju zarysowanego: |
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beff= |
840,0 |
mm |
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d= |
200,00 |
mm |
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h= |
230,0 |
mm |
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xeff= |
30,00 |
mm |
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bw= |
220,0 |
mm |
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ht= |
30,0 |
mm |
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III= |
((bw*xeff3)/12)+bw*xeff*(ht-xeff)2+ae*As1*(h-xeff-a)2 |
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As1= |
542,0 |
mm2 |
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a= |
wojciech koczan:
grubość otuliny
30 |
mm |
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III= |
45588,4385454545 |
cm4 |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,128 |
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bw= |
220,00 |
mm |
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h= |
230,00 |
mm |
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B(oo,to)= |
3248832339,62364 |
kN/mm2 |
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AsI= |
542,0 |
mm2 |
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Eceff= |
7,1 |
kN/mm2 |
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leff= |
4,99 |
m |
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a(oo,to)= |
ak*Msd*leff2/B(oo,to) |
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B(oo,to)= |
3248832339,62364 |
kN/mm2 |
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ak= |
0,104 |
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a(oo,to)= |
18,880 |
mm < alim= leff/200 = |
|
24,95 |
mm |
Msd = |
23,649 |
kNm |
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18,880 |
mm< |
24,95 |
mm |
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Warunek został spełniony. |
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|
POZ.3 BELKA W FAZIE MONTAŻU. |
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3.1.) Obciążenie belki stropowej: |
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gmk= |
gk*0,61 |
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gmk= |
3,650 |
kN/m2 |
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|
gmk= |
2,227 |
kN/mb |
|
|
gmo= |
4,315 |
kN/m2 |
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gmo= |
go*0,61 |
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gmo= |
2,632 |
kN/mb |
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3.1..) Belka w fazie montażu. |
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qmo |
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5,10 |
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M=ql2/8 |
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M=ql2/8 |
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Q=ql/2 |
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Q=ql/2 |
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Q=ql/2 |
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Mmax= |
8,558 |
kNm |
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Mmax= |
2,399 |
kNm |
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3.2 Wymiarowanie zbrojenia dla belki o długości 5,10m. |
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Materiały: |
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Beton: B 20 |
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fcd= |
10,6 |
MPa |
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EC= |
27,5 |
kN/mm2 |
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Stal A III |
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fyd= |
350 |
MPa |
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Es= |
200 |
kN/mm2 |
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Rozpietość stropu w osiach modularnych: |
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lm= |
5,1 |
m |
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Rozpietość efektywna przęsła: |
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leff= |
5,0 |
m |
z wcześniejszych obliczeń. |
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3.2.1.)Efektywna szerokość współpracująca. |
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bw= |
60,0 |
mm |
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d= |
20cm - 3cm - 0,5 |
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d= |
165,0 |
mm |
wysokośc użyteczna stropu |
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3.2.2.) Nośność przekroju na zginanie. |
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bw= |
60,0 |
mm |
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Msd= |
8,558 |
kNm = |
8557778 |
Nmm |
d= |
165,00 |
mm |
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fcd= |
10,60 |
N/mm2 |
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a= |
0,85 |
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3.2.3.) Obliczenie nośności przekroju 1-1. |
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Sb= |
Msd/(a*fcd*bw*d2) |
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Msd= |
8,56 |
kNm |
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Sb= |
0,581 |
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bw= |
60,0 |
mm |
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Stąd x= |
1-(1-2*sb)1/2 |
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fcd= |
10,60 |
N/mm2 |
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Stąd x= |
0,60 |
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a= |
0,85 |
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Stal klasy III --- fyd= |
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350,0 |
N/m2 |
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d= |
165,00 |
mm |
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z= |
sb/x |
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fyd= |
350,00 |
N/mm2 |
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z= |
0,975 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
151,989 |
mm2 |
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Przyjęto zbrojenie 2f10 i 1f12o As1= |
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271,0 |
mm2 |
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Przyjmuję zbrojenie jak dla belki przyjetej wcześniej. |
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Zaleca się stosowanie podparć w połowie rozpiętości. |
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3.3 Wymiarowanie zbrojenia dla belki o długości 2,7m (nad korytarzem). |
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Rozpietość stropu w osiach modularnych: |
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lm= |
2,7 |
m |
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Rozpietość efektywna przęsła: |
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leff= |
2,7 |
m |
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bw= |
60,0 |
mm |
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d= |
165,0 |
mm |
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3.3.1.) Nośność przekroju na zginanie. |
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d= |
165,00 |
mm |
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hf= |
30,00 |
mm |
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Msd= |
2,399 |
kNm = |
2398546,6875 |
Nmm |
bw= |
60,0 |
mm |
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fcd= |
10,60 |
N/mm2 |
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a= |
0,85 |
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3.3.2.) Obliczenie nośności przekroju 1-1. |
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Sb= |
Msd/(a*fcd*bw*d2) |
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Msd= |
2,399 |
kNm |
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Sb= |
0,163 |
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beff= |
60,00 |
mm |
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Stąd x= |
1-(1-2*sb)1/2 |
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fcd= |
10,60 |
N/mm2 |
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Stąd x= |
0,18 |
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a= |
0,85 |
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Stal klasy III --- fyd= |
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350,0 |
N/m2 |
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d= |
165,00 |
mm |
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z= |
sb/x |
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fyd= |
350,00 |
N/mm2 |
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z= |
0,911 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
45,616 |
mm2 |
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Przyjęto zbrojenie 3f6 o As1= |
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84,0 |
mm2 |
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Przyjmuję zbrojenie jak dla belki przyjetej wcześniej. |
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POZ. 4 |
PODCIĄG |
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4.1.) Obciążenia. |
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4.1.1.)Obciążenia stałe. |
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Na podstawie KOBIAKA projektuję podciąg nnie osłabiając go. Czyli żeberka opieram na |
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podciągu (książka tom I, strona 417) |
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230 |
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623 |
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600 |
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G = G1 + G2 |
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G1= |
go*L kNm |
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G1= |
21,118 |
kN/m |
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go= |
4,400 |
kN/mb |
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G2= |
(H-h)*0,3*25*L *1,1 kNm |
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L= |
4,800 |
m |
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G2= |
14,652 |
kN/m |
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H= |
0,600 |
m |
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h= |
0,230 |
m |
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G = |
Wojciech Koczan:
g1(suma oc.stałych i ciężarupodciagu
35,770 |
kN/m |
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Zamiana na obciążenie równomierne: |
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G * 0,61= |
21,819 |
kN/m |
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4.1.2.) Obciążenia zmienne. |
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P= |
po * lżebr. |
kN/m |
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po = |
3,714 |
kN |
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P= |
18,9421698113208 |
kN/m |
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lżebr.= |
5,100 |
m |
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4.2.) Schemat statyczny belki. |
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l1 |
l2 |
l2 |
l2 |
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4.2.2.) Długość obliczeniowa przęseł. |
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Przęsło skrajne |
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l1= |
4,45 |
m |
l3= |
5,00 |
m |
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Przesło posrednie |
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l2= |
5,12 |
m |
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4.3.) Obliczenia statyczne. |
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4.3.1.)Momenty: |
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maxM(x/l)=a*g*L2+b*p*L2 |
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|
p= |
18,942 |
kN/m |
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minM(x/l)=a*g*L2+c*p*L2 |
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g= |
21,819 |
kN/m |
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Przekrój |
|
Współczynnki |
|
L |
Mnożniki |
|
Momenty |
(kNm) |
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|
L [m] |
a |
b |
c |
(m) |
gl2 (kNm) |
pl2 (kNm) |
Mmax |
Mmin |
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Przęsło skrajne |
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0 |
0 |
0 |
0 |
5,00 |
545,4864 |
473,5542 |
0 |
0 |
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|
|
|
|
|
|
0,5 |
0,03429 |
0,03964 |
-0,00536 |
5,00 |
545,4864 |
473,5542 |
37,4764189390189 |
16,166477901283 |
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|
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1 |
0,05857 |
0,06929 |
-0,01071 |
5,00 |
545,4864 |
473,5542 |
64,7617121036604 |
26,8773724810189 |
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|
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|
|
|
1,5 |
0,07286 |
0,08893 |
-0,01607 |
5,00 |
545,4864 |
473,5542 |
81,8573181370189 |
32,1341223823019 |
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|
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|
1,9645 |
|
|
|
5,00 |
545,4864 |
473,5542 |
0 |
0 |
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|
|
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2 |
0,07714 |
0,09857 |
-0,02143 |
5,00 |
545,4864 |
473,5542 |
88,7570628535472 |
31,9305534195849 |
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|
2,5 |
0,07143 |
0,09822 |
-0,02679 |
5,00 |
545,4864 |
473,5542 |
85,4765915236981 |
26,2775753208679 |
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3 |
0,05572 |
0,08786 |
-0,03214 |
5,00 |
545,4864 |
473,5542 |
72,000978198566 |
15,1744687646038 |
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|
3,5 |
0,03 |
0,0675 |
-0,0375 |
5,00 |
545,4864 |
473,5542 |
48,3295035566038 |
-1,39369219811321 |
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|
|
|
|
3,9285 |
0 |
0,04209 |
-0,04209 |
5,00 |
545,4864 |
473,5542 |
19,9318981839623 |
-20,4054524292453 |
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4 |
-0,00571 |
0,03738 |
-0,04309 |
5,00 |
545,4864 |
473,5542 |
14,5867303446792 |
-27,8153167779623 |
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|
4,25 |
-0,02732 |
0,02484 |
-0,05216 |
5,00 |
545,4864 |
473,5542 |
-3,13960099516981 |
-46,971781938566 |
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4,5 |
-0,05143 |
0,01629 |
-0,06772 |
5,00 |
545,4864 |
473,5542 |
-20,3401668963396 |
-71,6071494906793 |
|
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|
4,75 |
-0,07803 |
0,01393 |
-0,09197 |
5,00 |
545,4864 |
473,5542 |
-35,9676931552076 |
-99,6465325184151 |
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5 |
-0,1014 |
0,0134 |
-0,12054 |
5,00 |
545,4864 |
473,5542 |
-48,9666940732076 |
-112,394549686415 |
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Przęsło środkowe |
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5 |
-0,10714 |
0,01340 |
-0,12054 |
5,12 |
571,9839473664 |
496,5576 |
-54,6284880623908 |
-112,394549686415 |
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|
5,256 |
-0,08160 |
0,01163 |
-0,09323 |
5,12 |
571,9839473664 |
496,5576 |
-40,8989250275073 |
-92,9679566729232 |
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|
5,512 |
-0,05857 |
0,01455 |
-0,07212 |
5,12 |
571,9839473664 |
496,5576 |
-26,2761864800576 |
-69,3128350849421 |
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|
5,768 |
-0,03803 |
0,01980 |
-0,05780 |
5,12 |
571,9839473664 |
496,5576 |
-11,9207087155668 |
-50,4535797405933 |
|
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|
6,024 |
-0,02000 |
0,03000 |
-0,05000 |
5,12 |
571,9839473664 |
496,5576 |
3,4570495417286 |
-36,2675597624223 |
|
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|
6,362432 |
0 |
0,04882 |
-0,04882 |
5,12 |
571,9839473664 |
496,5576 |
24,2419428278581 |
-24,2419428278581 |
|
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|
6,536 |
0,00857 |
0,05678 |
-0,04821 |
5,12 |
571,9839473664 |
496,5576 |
33,0964438825512 |
-19,0371402529839 |
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|
7,048 |
0,02714 |
0,07357 |
-0,04643 |
5,12 |
571,9839473664 |
496,5576 |
52,0553881628539 |
-7,53152579337251 |
|
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|
|
|
|
7,56 |
0,03572 |
0,08036 |
-0,04464 |
5,12 |
571,9839473664 |
496,5576 |
60,3346366459474 |
-1,73506539178841 |
|
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|
|
|
|
|
|
7,742784 |
|
|
|
5,12 |
571,9839473664 |
496,5576 |
0 |
0 |
|
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|
|
|
|
|
|
8,072 |
0,03429 |
0,07715 |
-0,04286 |
5,12 |
571,9839473664 |
496,5576 |
57,9227496528844 |
-1,66912987950501 |
|
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|
|
|
|
8,584 |
0,02286 |
0,06393 |
-0,04107 |
5,12 |
571,9839473664 |
496,5576 |
44,8204814469755 |
-7,31806826472259 |
|
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|
|
|
|
|
|
9,096 |
0,00143 |
0,04170 |
-0,04027 |
5,12 |
571,9839473664 |
496,5576 |
21,5243896445226 |
-19,178438163743 |
|
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|
|
|
|
|
|
9,123136 |
0 |
0,04092 |
-0,04092 |
5,12 |
571,9839473664 |
496,5576 |
20,3191376590732 |
-20,3191376590732 |
|
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|
|
|
|
|
|
9,352 |
-0,01303 |
0,03451 |
-0,04754 |
5,12 |
571,9839473664 |
496,5576 |
9,68325250439392 |
-31,0592999131759 |
|
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|
|
|
|
|
|
9,608 |
-0,03000 |
0,03105 |
-0,06105 |
5,12 |
571,9839473664 |
496,5576 |
-1,74140443481841 |
-47,4743608962222 |
|
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|
|
|
|
|
|
9,864 |
-0,04947 |
0,03173 |
-0,08129 |
5,12 |
571,9839473664 |
496,5576 |
-12,5402727109569 |
-68,6612145053962 |
|
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|
|
|
10,12 |
-0,07143 |
0,03571 |
-0,10714 |
5,12 |
571,9839473664 |
496,5576 |
-23,1247408822416 |
-94,0579963709661 |
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4.3.2.) Siły poprzeczne. |
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Qmax= |
a*g*L+b*p*L |
|
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p= |
18,942 |
kN/m |
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Qmin= |
a*g*L+g*p*L |
|
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g= |
21,819 |
kN/m |
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Przekrój |
|
Współczynnki |
|
L |
Mnożniki |
|
Siły poprz. (kN) |
|
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L [m] |
a |
b |
g |
(m) |
gl (kN) |
pl (kN) |
Qmax |
Qmin |
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Przęsło skrajne |
|
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0 |
0,3929 |
0,4464 |
-0,0535 |
5,00 |
109,0973 |
94,7108 |
85,1432 |
37,7973 |
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0,5 |
0,2929 |
0,3528 |
-0,5990 |
5,00 |
109,0973 |
94,7108 |
65,3686 |
-24,7772 |
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1 |
0,1929 |
0,2715 |
-0,0788 |
5,00 |
109,0973 |
94,7108 |
46,7589 |
13,5817 |
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|
1,5 |
0,0929 |
0,2029 |
-0,1101 |
5,00 |
109,0973 |
94,7108 |
29,3520 |
-0,2925 |
|
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|
|
|
1,9645 |
0 |
0,1498 |
-0,1498 |
5,00 |
109,0973 |
94,7108 |
14,1877 |
-14,1877 |
|
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2 |
-0,0071 |
0,1461 |
-0,1533 |
5,00 |
109,0973 |
94,7108 |
13,0627 |
-15,2938 |
|
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|
2,5 |
-0,1071 |
-0,1007 |
-0,2079 |
5,00 |
109,0973 |
94,7108 |
-21,2217 |
-31,3747 |
|
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3 |
-0,2071 |
0,066 |
-0,2731 |
5,00 |
109,0973 |
94,7108 |
-16,3431 |
-48,4596 |
|
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|
3,5 |
-0,3071 |
0,041 |
-0,3481 |
5,00 |
109,0973 |
94,7108 |
-29,6206 |
-66,4726 |
|
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|
|
|
|
3,9285 |
|
|
|
5,00 |
109,0973 |
94,7108 |
0,0000 |
0,0000 |
|
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4 |
-0,4071 |
0,0247 |
-0,4319 |
5,00 |
109,0973 |
94,7108 |
-42,0741 |
-85,3191 |
|
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4,25 |
|
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5,00 |
109,0973 |
94,7108 |
0,0000 |
0,0000 |
|
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|
4,5 |
-0,5071 |
0,016 |
-0,5231 |
5,00 |
109,0973 |
94,7108 |
-53,8079 |
-104,8665 |
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4,75 |
|
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5,00 |
109,0973 |
94,7108 |
0,0000 |
0,0000 |
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5 |
-0,6071 |
0,0134 |
-0,6205 |
5,00 |
109,0973 |
94,7108 |
-64,9638 |
-125,0010 |
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Przęsło środkowe |
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5 |
0,5357 |
0,6027 |
-0,067 |
5,12 |
111,7156 |
96,9839 |
118,2983 |
53,3481 |
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5,256 |
|
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5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
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|
5,512 |
0,4357 |
0,5064 |
-0,0707 |
5,12 |
111,7156 |
96,9839 |
97,7871 |
41,8177 |
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5,768 |
|
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5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
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|
6,024 |
0,3357 |
0,4187 |
-0,0830 |
5,12 |
111,7156 |
96,9839 |
78,1101 |
29,4533 |
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|
6,362432 |
|
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|
5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
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|
6,536 |
0,2357 |
0,341 |
-0,1153 |
5,12 |
111,7156 |
96,9839 |
59,4029 |
15,1491 |
|
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|
|
7,048 |
0,13357 |
0,2742 |
-0,1385 |
5,12 |
111,7156 |
96,9839 |
41,5148 |
1,4896 |
|
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|
|
7,56 |
0,0357 |
0,219 |
-0,1833 |
5,12 |
111,7156 |
96,9839 |
25,2277 |
-13,7889 |
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|
|
7,742784 |
0 |
0,2028 |
-0,2028 |
5,12 |
111,7156 |
96,9839 |
19,6683 |
-19,6683 |
|
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|
|
|
8,072 |
-0,0643 |
0,1755 |
-0,2398 |
5,12 |
111,7156 |
96,9839 |
9,8374 |
-30,4401 |
|
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|
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|
|
|
|
8,584 |
-0,1643 |
0,1435 |
-0,3078 |
5,12 |
111,7156 |
96,9839 |
-4,4377 |
-48,2065 |
|
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|
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|
|
|
9,096 |
-0,2643 |
0,1222 |
-0,3865 |
5,12 |
111,7156 |
96,9839 |
-17,6750 |
-67,0107 |
|
|
|
|
|
|
|
|
|
9,123136 |
|
|
|
5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
|
|
|
|
|
|
|
|
|
9,352 |
|
|
|
5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
|
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|
|
|
|
9,608 |
-0,3643 |
0,1106 |
-0,4749 |
5,12 |
111,7156 |
96,9839 |
-29,9716 |
-86,7557 |
|
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|
|
|
|
|
|
|
9,864 |
|
|
|
5,12 |
111,7156 |
96,9839 |
0,0000 |
0,0000 |
|
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|
|
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|
|
10,12 |
-0,4634 |
-0,1074 |
-0,5714 |
5,12 |
111,7156 |
96,9839 |
-62,1851 |
-107,1856 |
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4.4.) Obliczenie stanu granicznego nośności. |
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4.4.1.) Przęsło skrajne. |
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4.4.1.1.) Przekrój w przęśle. |
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Beton B20 |
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570 |
600 |
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Typ przekroju - prostokątny. |
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Msd max= |
88,757 |
kNm |
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Ilość zbrojenia : |
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b=300 |
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|
|
|
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|
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|
|
|
Sb= |
Msd/(a*fcd*bw*d2) |
|
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|
|
|
|
|
|
|
|
Sb= |
0,101 |
|
|
|
Msd= |
88,76 |
kNm |
|
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|
|
|
|
|
|
|
|
Stąd x= |
1-(1-2*sb)1/2 |
|
|
|
beff= |
300,00 |
mm |
|
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|
|
|
|
|
|
|
|
Stąd x= |
0,11 |
|
|
|
fcd= |
10,60 |
N/mm2 |
|
|
|
|
|
|
|
|
|
|
Stal klasy III --- fyd= |
|
350,0 |
N/m2 |
|
a= |
0,85 |
|
|
|
|
|
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|
|
|
|
z= |
sb/x |
|
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|
d= |
570,00 |
mm |
|
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|
|
|
|
|
|
|
z= |
0,947 |
> zefflim = |
0,530 |
dla A III |
fyd= |
350,00 |
N/mm2 |
|
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|
|
|
|
|
|
|
|
AS1= |
Msd*1000000/(z*fyd*d) |
|
|
|
f= |
16,00 |
mm |
|
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|
|
|
|
|
|
AS1= |
469,987 |
mm2 |
|
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|
Przyjęto zbrojenie 4f14 o As1= |
|
|
616,0 |
mm2 |
|
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|
|
|
4.4.1.2.) Przekrój nad podporą pośrednią B. |
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Msd= |
112,39 |
kNm |
|
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a= |
0,85 |
|
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fcd= |
10,60 |
N/mm2 |
|
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|
d= |
570,00 |
mm |
|
540 |
600 |
|
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beff= |
300,0 |
mm |
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Sb= |
Msd*1000000/(a*fcd*beff*d2) |
|
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|
|
Sb= |
0,128 |
|
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|
Stąd x= |
1-(1-2*sb)1/2 |
|
|
a
|
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|
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|
Stąd x= |
0,14 |
|
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|
b=300 |
|
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|
Przekrój pojedyńczo zbrojony. |
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|
Stal klasy III --- fyd= |
|
350,0 |
N/m2 |
|
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|
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|
z= |
sb/x |
|
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|
|
|
z= |
0,931 |
> zefflim = |
0,530 |
dla A III |
|
Msd= |
112,39 |
kNm |
|
|
|
|
|
|
|
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|
|
AS2= |
Msd*1000000/(z*fyd*d) |
|
|
|
fyd= |
350,00 |
N/m2 |
|
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|
|
|
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|
|
AS2= |
604,949 |
mm2 |
|
|
d= |
570,00 |
mm |
|
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|
|
Przyjęto zbrojenie górne nad podp. B 4f16 o As1= |
|
|
|
|
804 |
mm2 |
|
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|
4.4.2.) Przęsło drugie. |
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|
4.4.2.1.) Zbrojenie na zginanie. |
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|
Msd max= |
60,335 |
kNm |
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|
Ilość zbrojenia : |
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Sb= |
Msd/(a*fcd*beff*d2) |
|
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|
570 |
600 |
|
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|
Sb= |
0,069 |
|
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|
Stąd x= |
1-(1-2*sb)1/2 |
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|
Stąd x= |
0,07 |
|
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|
|
Stal klasy III --- fyd= |
|
350,0 |
N/m2 |
|
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b=300 |
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z= |
sb/x |
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|
|
z= |
0,964 |
> zefflim = |
0,530 |
dla A III |
|
Msd= |
60,33 |
kNm |
|
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|
beff= |
300,00 |
mm |
|
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|
AS1= |
Msd*1000000/(z*fyd*d) |
|
|
|
fcd= |
10,60 |
N/mm2 |
|
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|
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AS1= |
313,600 |
mm2 |
|
|
a= |
0,85 |
|
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|
d= |
570,00 |
mm |
|
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|
|
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|
|
Przyjęto zbrojenie 4f12 o As1= |
|
|
452,0 |
mm2 |
fyd= |
350,00 |
N/m2 |
|
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|
Przekrój przy podporze C: |
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a= |
0,85 |
|
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Msd max= |
94,058 |
kNm |
|
fcd= |
10,60 |
N/mm2 |
|
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d= |
570,00 |
mm |
|
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Sb= |
Msd*1000000/(a*fcd*beff*d2) |
|
|
beff= |
300,00 |
mm |
|
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|
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Sb= |
0,1071 |
|
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fyd= |
350,00 |
N/mm2 |
|
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Stąd x= |
1-(1-2*sb)1/2 |
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Stąd x= |
0,11 |
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|
Stal klasy III --- fyd= |
|
350,0 |
N/m2 |
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z= |
sb/x |
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z= |
0,943 |
> zefflim = |
0,530 |
dla A III |
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AS1= |
Msd*1000000/(z*fyd*d) |
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AS1= |
499,847 |
mm2 |
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|
Przyjęto zbrojenie górne nad podpora C 4f14 o As1= |
|
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|
616 |
mm2 |
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4.4.1.3.) Zbrojenie na ścinanie: |
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Vsd= |
2*fctd*b*d |
kN |
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fctd= |
0,87 |
N/mm2 |
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Vsd= |
297540 |
N |
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b= |
300,00 |
mm |
|
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Vsd= |
297,54 |
kN |
|
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d= |
570,00 |
mm |
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|
Jeżeli siła tnąca nie przekracza Vsd>VSD to należy stosować co najmniej 4 strzemiona. |
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130 |
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20 50
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600 |
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45o |
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Maksymalny odstęp strzemion Smax |
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Vsd<= |
1/5Vrd2 |
Smax= |
0,8d<=300mm |
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|
1/5Vrd2<Vsd<= |
2/3Vrd2 |
Smax= |
0,6d<=300mm |
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|
Vsd> |
1/3Vrd2 |
Smax= |
0,3d<=200mm |
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VRd2=bw*z*(g*fcd)/(ctgO+ctgO) |
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Wspołczynnik efektywny: |
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n= |
0,7-fck/200>=0,5 |
|
|
B20 Stąd fck= |
16,0 |
N/mm |
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n= |
0,62 |
>0,5 |
|
d= |
570,000 |
m |
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k= 1,6-d |
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As1= |
804,0 |
mm2 |
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k= |
1,0 |
<1 |
|
d= |
0,570 |
m |
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|
Przyjmuję k = 1 |
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Efektywny stopień zbrojenia: |
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rL= |
As1/bw*d |
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d= |
570,000 |
m |
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rL= |
0,005 |
|
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As1= |
804,0 |
mm2 |
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bw= |
300,000 |
m |
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|
Nośnośc przekroju bez zbrojenia. |
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|
trd= |
0,22 |
N/mm2 |
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|
VRd1= |
(k*trd(1,2+4,0*rL))*bw*d |
|
|
rL= |
0,005 |
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|
VRd1= |
45851,52 |
N |
|
k= |
1,00 |
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d= |
570,0 |
mm |
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|
VRd1= |
45,85 |
kN<VsdAk= |
125,00 |
kN |
bw= |
300,0 |
mm |
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Nośnośc przekroju zbrojonego strzemionami. |
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|
n= |
0,62 |
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|
VRd2= |
bw*z*g*fcd/(cotO+tgO) |
|
|
bw= |
300,0 |
mm |
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|
VRd2= |
505,72 |
kN |
|
d= |
570,0 |
mm |
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|
|
VRd2> |
Vsdmax = |
125,0010 |
kN |
fcd= |
10,60 |
N/mm2 |
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|
z=0,9*d= |
513,0 |
mm |
|
O= |
44o59'59'' |
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|
1/5Vrd2<Vsd<= |
2/3Vrd2 |
|
Vsdmax = |
125,0010 |
kN |
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|
101,1 |
kN<Vsd<= |
337,14 |
kN |
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Smax= |
0,6d<=300mm |
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S |
<=300mm |
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Smax= |
342,0 |
mm |
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|
Przyjęto strzemiona czterocięte ze stali A-I dla której fywd= |
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|
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|
|
210 |
N/mm |
|
|
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|
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|
|
Strzemiona f8 o Asw1= |
|
|
201,0 |
mm2 |
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4.4.2.)Nośność na przebicie elementów nie zbrojonych: |
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Nosność elementów niezbrojonych na przebicie obciążonych w sposób ciagły. |
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Nsd-(go+po)*A<= Nfd= fctd*up*d |
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A- |
pole powierzchni odciętej przekrojami przebicia |
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A= |
742800 |
mm2 |
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q,p- |
obciążenie równomierne (stałe + zmienne) |
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qo+po= |
40,762 |
kN/m |
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po= |
18,9421698113208 |
kN/m |
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qo= |
21,819 |
kN/m |
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Up- |
średnia arytmetyczna obwodow na która działa siła i powierzchni powstajacej |
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w poziomie zbrojenia przy założeniu sił pod katem 45o |
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Up= |
(up1+up2)/2 |
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Up= |
2476,00 |
mm |
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d- |
wysokość użyteczna |
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d= |
570,00 |
mm |
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Nsd= |
125,00 |
kN |
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fctd= |
0,87 |
N/mm2 |
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Max. siła ścinająca. |
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Nsd-(go+po)*A<= Nfd= fctd*up*d |
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(go+po)= |
40,76 |
kN/m |
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Nsd-(go+po)*A= |
94,7233048749736 |
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A= |
742800,0 |
mm2 |
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Nfd= fctd*up*d |
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up= |
2476,00 |
mm |
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Nfd= |
1227,8 |
kN |
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d= |
570,00 |
mm |
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94,72 |
kN<= Nfd= |
1227,85 |
kN |
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fctd= |
0,87 |
N/mm2 |
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Nośnośc na przebicie jest zapewniona. |
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4.5.) Sprawdzenie SGU. |
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4.5.1.) Sprawdzenie zarysowań (rysy prostopadłe). |
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Wk= b*srm*e sm |
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Dla b= |
300,0 |
mm=<300 |
b= |
1,3 |
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Aceff= |
2,5*a*b |
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a= |
30,00 |
mm |
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Aceff= |
22500,0 |
mm2 |
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b= |
300,00 |
mm |
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rr = |
As/Aceff |
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As= |
804,0 |
mm2 |
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rr = |
0,036 |
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Aceff= |
22500,0 |
mm2 |
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k1= |
0,8 |
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srm= |
50+0,25*k1*k2*f/rr |
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k2= |
0,5 |
el. zgin. |
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srm= |
72,4 |
mm |
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f= |
8,00 |
mm |
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Wc= |
b*h2/6 |
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h= |
600,00 |
mm |
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Wc= |
245*105 |
mm3 |
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b= |
300,00 |
mm |
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Mcr= |
fctm*Wc |
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fctm= |
1,90 |
N/mm2 |
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Mcr= |
46550000 |
Nmm |
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Wc= |
245*105 |
mm3 |
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Mcr= |
46,55 |
kNm |
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Msd= |
112,395 |
kNm |
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ssr/ss= |
Mcr/Msd |
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Msdk= |
0,8*Msd |
kNm |
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ssr/ss= |
0,518 |
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Msdk= |
89,92 |
kNm |
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bw |
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b1= |
1,0 |
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e sm= |
ss/Es*[1-b1*b2(ssr/ss)2] |
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b2= |
0,5 |
obc. dług. |
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e sm= |
0,0015 |
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ss=fyd= |
350,00 |
N/mm2 |
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Es= |
205000 |
N/mm2 |
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ssr/ss= |
0,518 |
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Wk= b*srm*e sm |
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b= |
1,3 |
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Wk= |
0,139 |
mm |
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srm= |
72,4 |
mm |
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e sm= |
0,0015 |
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Wk= |
0,139 |
mm<Wlm= |
0,3mm |
Warunek sprawdzony. |
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4.5.2)Rysy ukośne. |
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wk=4*t2*l/(rw*Es*fck) |
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Vsd=34,438*5,12/2 |
wojciech koczan:
tutaj 2,323 biorę mnożąc obciążenia stałe przez 0,61m
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siła od komb. od obc. długotrwałych |
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Vsd= |
91,570 |
kN |
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t=Vsd/(bw*d) |
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t=91,57kN/(300mm*570mm) |
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t= |
0,54 |
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rw=rw1+rw2 |
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Suma stopni zbrojenia strzemionami i pr.odgietymi |
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rw1=Asw1/(bw*s) |
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rw1=201,0/(300*170) |
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rw1= |
0,004 |
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rw2=0 |
- belka nie jest zbrojona prętami odgiętymi |
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rw=rw1=0,004 > rwmin=0,0015 |
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l=1/(3*(rw1/(b1*f1)+rw2/(b2*f2))) |
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l=1/(3*(0,004/(1,0*8)) |
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l= |
666,67 |
mm |
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b1=1,0 -dla prętów gładkich |
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f1=8mm |
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wk=4*t2*l/(rw*Es*fck) |
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wk=4*0,542*666,67/(0,004*205000*16) |
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wk= |
0,059 |
mm<wklim=0,3mm |
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O.K. |
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1.5.3.)Sprawdzenie ugięcia. |
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a(oo,to)=ak*Msd*l2eff/B(oo,to) |
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Msk =(pk+gk)*k*leff2 |
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k= |
0,080 |
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Msk = |
51,4680853166892 |
kNm |
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l= |
5,120 |
m |
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ak= |
5/48 = |
0,104 |
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pk= |
15,785 |
kN/mb |
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gk= |
18,183 |
kN/mb |
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leff= |
4,35 |
m |
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b1= |
1,0 |
pr. gładkie |
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b2= |
0,5 |
obc. dług. |
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ssr/ss= |
Mcr /Msd= |
0,518 |
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Ac= |
bw*h |
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h= |
600,00 |
mm |
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Ac= |
180000 |
mm2 |
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bw= |
300,00 |
mm |
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u= |
2*bw+2*h |
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u= |
1800 |
mm |
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2*Ac/u= |
200,00 |
mm |
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F(oo,to)=2,5 |
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Ec,eff=Ecm/(1+F(oo,to)) |
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Ec,eff= |
7,86 |
kN/mm2 |
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Dla obciażenia dzałającego długotrwale |
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Dla przekroju niezarysowanego: |
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B20 - Ecm=27,5 kN/mm2 |
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beff= |
300,0 |
mm |
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ae=Es/Eceff |
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h= |
600,00 |
mm |
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ae= |
26,09 |
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bw= |
300,00 |
mm |
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B(oo,to)=Ec,eff*II |
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As1= |
804,0 |
mm2 |
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Ec,eff=27,5 kN/mm2 |
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Ec,eff= |
7857,1 |
N/mm2 |
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ae=Es/Eceff |
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Es= |
205000 |
N/mm2 |
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ae= |
26,09 |
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a= |
wojciech koczan:
grubość nadbetonu
30 |
mm |
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b= |
300,0 |
mm |
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xeff= |
fyd*As1/(a*fcd*bw) |
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h= |
600,0 |
mm |
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xeff= |
79,76 |
mm |
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fyd= |
350,0 |
N/mm2 |
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fcd= |
10,60 |
N/mm2 |
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Ac= |
h*b |
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As1= |
616,0 |
mm2 |
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Ac= |
1800,00 |
cm2 |
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a= |
0,85 |
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a= |
30 |
mm |
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II= |
((bw*h3)/12)+ae*As1*(0,5h-a)2 |
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II= |
5404339440 |
mm4 |
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Moment bezwładności dla przekroju zarysowanego: |
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xeff= |
79,76 |
mm |
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III= |
((bw*xeff3)/12)+bw*xeff*(0,5h-0,5xeff)2+ae*As1*(0,5h-a)2 |
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b= |
300,0 |
mm |
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h= |
600,0 |
mm |
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III= |
1669928780,76218 |
mm4 |
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As1= |
616,0 |
mm2 |
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a= |
wojciech koczan:
grubość
otuliny
30 |
mm |
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ssr/ss= |
Mcr /Msd= |
wojciech koczan:
z rys
0,518 |
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b= |
300,00 |
mm |
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h= |
600,00 |
mm |
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B(oo,to)= |
13687660661225,6 |
kN/mm2 |
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AsI= |
616,0 |
mm2 |
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Eceff= |
7857,1 |
N/mm2 |
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leff= |
4,4 |
m |
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a(oo,to)= |
ak*Msd*leff2/B(oo,to) |
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B(oo,to)= |
13687660661225,6 |
kN/mm2 |
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ak= |
0,104 |
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a(oo,to)= |
7,418 |
mm < alim= leff/200 = |
|
21,76 |
mm |
Msk= |
51,468 |
kNm |
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7,418 |
mm< |
21,76 |
mm |
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Warunek został spełniony. |
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POZ.5. SŁUP. |
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WOJCIECH KOCZAN:UWAŻAJ- jaką przyjmujesz srednicę prętów w słupie i stopie fundamentowej-PATRZ NOTATKI
( PROF. WOLIŃSKI)
KOMENATRZ |
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5.1.) Zestawienie obciążeń. |
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Obciążenie obliczeniowe stropodachu |
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gk [kN] |
gf |
go [kN] |
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Pokrycie papowe 0,2*0,45*5,12*5,1*1/cos5,0= |
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2,35008 |
1,3 |
3,055104 |
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Wylewka 0,03*21*5,12*5,10*1/cos5,0= |
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16,45056 |
1,3 |
21,385728 |
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Płyta panwiowa 0,03*21*5,12*5,101/cos5,0= |
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26,112 |
1,1 |
28,7232 |
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Razem = |
44,91264 |
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53,164032 |
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Ciężar podciągu |
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(0,3*0,6*5,12*25) = |
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23,04 |
1,1 |
25,344 |
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Razem = |
67,95 |
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78,51 |
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Długość żebra = |
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5,1 |
m |
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Długość podciągu = |
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5,12 |
m |
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Ilość kondygnacji = |
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4 |
m |
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bw(Sł) = |
0,4 |
m |
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Wysokość kondyg.= |
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3,6 |
m |
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b) Obciążenie śniegiem (strefa I): |
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Sk = qk*c= 0,7*0,8*5,12*5,10 = |
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14,623 |
1,4 |
20,472 |
kN |
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c) Obciążenie z pozostałych kondygnacji: |
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(8,114*5,1*5,12*4 )= |
|
847,49 |
kN |
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d) Ciężar własny słupa: |
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gk [kN] |
gf |
go [kN] |
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0,4*0,4*(4,0-0,5)*4*25 = |
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56 |
1,1 |
61,6 |
kN |
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Obciążenie całkowite na poziomie posadzki parteru: |
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Nsd=a+b+c+d=78,51+847,49+20,472+61,6= |
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1008,07 |
kN |
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Obciążenie długotrwałe: |
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Nsd,lt = Nsd-Sk-(1-yd)*pd*x = 1008,07-20,47-0,2*10*1,2*5,1*5,12 = |
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924,93 |
kN |
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5.2.) Schemat statyczny słupa: |
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5.2.1.) Długość obliczeniowa słupa: |
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Beton B20 |
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6,23 |
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Przekrój słupa. |
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(cm) |
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d=37 |
40 |
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328 |
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H= |
3,60 |
m |
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hp= |
0,62 |
m |
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h= |
40,00 |
m |
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30 |
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lcol= H-hp+0,3 |
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lcol= |
3,3 |
m |
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lo= |
0,8 * lcol = |
2,622 |
m |
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lo/h= |
2,62 / 0,4 = |
0,066 |
m <10 |
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h= |
40,00 |
m |
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lo= |
2,62 |
m |
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5.3.) Obliczenie ilości zbrojenia w słupie: |
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5.3.1.) Określenie mimośrodu: |
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eo= |
ee+ ea |
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Mimośród statyczny: |
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ee =0 |
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Momośród niezamierzony: |
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lo/600= |
4,37 |
mm |
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lo= |
2,62 |
m |
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eamax= |
h/30= |
13,3333333333333 |
mm |
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h= |
0,4 |
m |
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10mm |
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lo/h= |
7 |
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7<lo/h<30 |
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ea= |
13,3mm = etot |
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Wpływ smukłości. |
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eo= |
13,33 |
mm |
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ea= |
13,33 |
mm |
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h=1/[(1-Nsd/Ncrit}] |
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ee= |
0,00 |
mm |
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Ncrit= |
fcd*b*h/(lo/h)2*[(,6*Es/fyd*mo+(0,1*Ecm/fcd+(lo/ho)2*no)*2,6/(2+kit)] |
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kit= |
1+0,5*Nsd,it/Nsd*f(D,to) |
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kit= |
1,918 |
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Nsd,it= |
924,93 |
kN |
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Nsd= |
1008,07 |
kN |
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no= |
Nsd/(fcd*b2) |
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f(D,to)= |
2,00 |
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no= |
1,057 |
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fcd= |
10,60 |
N/mm2 |
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mo= |
no*eo/h |
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b= |
300 |
mm |
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mo= |
0,517 |
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eo= |
13,33 |
mm |
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eo/h>= |
(0,5-0,01*lo/h-0,001*fcd |
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h= |
400 |
mm |
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eo/h>= |
0,49 |
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lo= |
2,62 |
m |
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eo/h>= |
0,03 |
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Ncrit= |
fcd*b*h/(lo/h)2*[(1,6*Es/fyd*mo+(0,1*Ecm/fcd+(lo/ho)2*mo)*2,6/(2*kit)] |
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Ncrit= |
26671,36 |
kN |
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Nsd= |
1008,07 |
kN |
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Es= |
205000,0 |
N/mm2 |
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h=1/[(1-Nsd/Ncrit}] |
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Ecm= |
27,50 |
kN/mm2 |
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h= |
1,039 |
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fcd= |
10,60 |
N/mm2 |
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h=b= |
400 |
mm |
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etot= |
eo*h |
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eo= |
13,33 |
mm |
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etot= |
13,86 |
mm |
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kit= |
1,918 |
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fyd= |
350,0 |
N/mm2 |
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5.3.3.) Wyznaczenie efektywnej strefy ściskanej: |
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etot= |
13,86 |
mm |
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es2= |
0,5*h-etot-a' |
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es2= |
156,1 |
mm |
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a'= |
30,00 |
mm |
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ea= |
13,33 |
mm |
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Nsd= |
1008,07 |
kN |
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a= |
0,85 |
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es2= |
156,14 |
mm |
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fcd= |
10,60 |
N/mm2 |
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d= |
370,00 |
mm |
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xeff= |
249,35 |
mm<h=300 |
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a'= |
30,00 |
mm |
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xeff/d= |
0,67 |
>zeff,lim=0,53 |
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Mimośród mały |
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5.3.4.)Określenie ilości zbrojenia: |
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es1=0,5*b-a+etot |
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es1=0,5*300-30,0+10,71= |
130,0 |
mm |
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Nsd= |
1008,07 |
kN |
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a= |
0,85 |
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As1=As2= |
690,465 |
mm2 |
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etot= |
13,86 |
mm |
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fcd= |
10,60 |
N/mm2 |
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As1=As2= |
6,905 |
cm2 |
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d= |
370,00 |
mm |
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a'= |
0,00 |
mm |
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Przyjęto zbrojenie 4f16o As1= |
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|
8,04 |
cm2 |
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xeff= |
249,35 |
mm |
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fyd= |
350,00 |
N/mm2 |
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5.3.4.) Rozstaw strzemion w słupie. |
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b= |
400,0 |
mm |
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rl= |
As1/(b*d) |
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As1= |
8,04 |
cm2 |
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rl= |
0,01 |
<3% |
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d= |
370,00 |
mm |
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STR 162 -PN
Przyjęto strzemiona dwucięte f 8 co 20 cm ,a przy końcach słupa 10cm. |
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POZ. 6. STOPA FUNDAMENTOWA. |
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Nsd |
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6.1.) Schemat stopy. |
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Nsd= |
1008,07 |
kN |
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Warunki gruntowe: |
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Pd |
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mw |
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ID=0,42 |
f= 30o |
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G
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6.2.). Określenie wymiarów stopy: |
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60 |
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Nsd= |
1008,07 |
kN |
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r= |
1,65 |
kN/m3 |
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Głębokość posadowienia: D= |
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1,50 |
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NR,sd= |
Nsd+Gst+Ggr+q*B2 |
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Gst+Ggr= |
m*hf*B2*gśr*1,2 |
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Gst+Ggr= |
1,5*B2*22,8*1,2 |
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NR,sd= |
1008,07+41,04B2 |
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Cu=0 |
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Opór gruntu: |
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qr= |
(1+0,3*B/L)Nc*Cu(r)+(1+1,5B/L)ND*D*rB(r)*g+(1-0,25B/L)NB*rB(r)B*g |
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Nc= |
30,14 |
ND= |
18,4 |
NB= |
7,53 |
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qr= |
1104+93,18*B |
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qr=Nr,sd/B2<m*qr |
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1008,07/B2+41,04<894,2+75,48*B |
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B=1,20m |
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782,31 |
kN/m2 < |
984,78 |
kN/m2 |
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1,2 |
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C.N.U. |
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40 |
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A |
40 |
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A |
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30 |
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Sredni obliczeniowy odpór gruntu: |
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qsd=Nrsd/B2= |
782,67 |
kN/m2 |
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a= |
0,05 |
m |
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A-A |
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Nsd= |
1008,07 |
kN |
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L=B= |
1,20 |
m |
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gsd= |
782,67 |
kN/m2 |
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Ma= |
105,66 |
kNm |
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ds=55 |
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fyd= |
21,5 |
kN |
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h=60 |
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As=M/(0,9*h*fyd)= |
8,15 |
cm2 |
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Stal kl A-I |
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Przyjęto zbrojenie prętami 10 |
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f 12 o Asw= |
10,17 |
cm2 |
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Rozstaw prętów co 150mm |
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5.3.) Obliczenie stopy na przebicie. |
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Nsd -A*gro<=NRd |
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Nsd= |
1008,07 |
kN |
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up= |
(u1+u2)/2 |
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d= |
55,00 |
m |
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up= |
300,00 |
m |
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fctd= |
0,87 |
N/mm2 |
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NRd= |
fctd*up*d |
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u1= |
160,00 |
m |
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NRd= |
14355,00 |
kN |
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u2= |
440,00 |
m |
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Nsd= |
1008,07 |
kN |
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Nsd -A*gro<=NRd |
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gro= |
782,67 |
kN/m2 |
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Nsd - A * gro = |
|
-118,98 |
kN<=NRd= |
14355,00 |
kN |
A= |
1,44 |
m2 |
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Warunek spełniony. |
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Napreżenia wychodzą poza podstawe ,czyli |
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nie było potrzeby sprawdzania na przebicie. |
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a= |
45o |
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1,2 |
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