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Konstrukcje żelbetowe. |
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Projekt stropu żelbetowego . |
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Dane: |
L = |
38,00 |
m. |
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B = |
16,80 |
m. |
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Wys. pomieszcz. |
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3,50 |
m. |
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Ilość kondygnacji |
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4 |
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pk = |
2,50 |
kN/m2. |
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fcd= |
10,60 |
N/mm2. |
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fck= |
16,00 |
N/mm2. |
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fyd= |
350,00 |
N/mm2. |
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fywd= |
210,00 |
N/mm2. |
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tRd= |
0,22 |
N/mm2. |
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gk |
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Poz. 1 PŁYTA STROPOWA |
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1.1. Zestawienie obciążeń. |
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1.1.1. Obciążenia stałe. |
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Warstwy stropu. |
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gr. |
g |
jednostka |
gk |
gf |
g0 |
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[mm] |
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parkiet |
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22 |
5,5 |
[kN/m3 ] |
0,121 |
1,2 |
0,15 |
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gładź cementowa |
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10 |
21 |
[kN/m2 ] |
0,210 |
1,3 |
0,27 |
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płyta betonowa |
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40 |
23 |
[kN/m2 ] |
0,920 |
1,1 |
1,01 |
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zebro 0,07*0,17/0,31 |
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0,04 |
24 |
[kN/m2 ] |
0,921 |
1,1 |
1,01 |
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pustaki 0,31*0,25 |
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0,1 |
0,078 |
[kN/m2 ] |
1,290 |
1,1 |
1,42 |
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tynk cem-wap |
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15 |
19 |
[kN/m2 ] |
0,285 |
1,3 |
0,37 |
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RAZEM |
3,748 |
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4,23 |
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qk = |
3,75 |
kN/m2. |
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q0 = |
4,23 |
kN/m2. |
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1.1.2. |
Obciążenia zmienne. |
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pk = |
2,50 |
kN/m2. |
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gf = |
1,30 |
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p0 = |
pk * gf = |
3,25 |
kN/m2. |
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1.1.3. Obciążenie zastępcze ścianką działową. |
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Ścianki działowe wykonane zostały z pustaków z gazobetonu obustronnie tynkowana. |
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Qk = |
0,12*7,5+0,03*19 = |
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1,47 |
kN/m2. |
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* przyjmuję obciążenie zastępcze = |
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0,75 |
gf = |
1,40 |
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h/265 = |
1,32 |
Qo,zas = |
0,75*1,25*1,20 |
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Qo,zas = |
1,39 |
kN/m2. |
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Redukcję obciążenia przyjęto na podstawie literatury Kobiak, Stachurski -"Konstrukcje żelbetowe" |
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1.1.4. Obciążenie stałe ścianką działową. |
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Ścianki działowe wykonane zostały z pustaków z gazobetonu obustronnie tunkowana. |
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Pks = |
(0,12*7,5+0,03*19)*3,3= |
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4,56 |
kN/mb |
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gf = |
1,3 |
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Pos = |
5,92 |
kN/mb |
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1.1.5. |
Obciążenia zmienne. |
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p0 = |
p0 +Qzas |
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p0 = |
4,64 |
kN/m2. |
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Obciążenia zmienne przyjęto na podstawie literatury Kobiak, Stachurski -"Konstrukcje żelbetowe" |
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1.1.6.Ciężar własny żebra pod ścianką działową. |
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Żebro zostało wykonane jako przekrój teowy wypełniony cegłą dziurawką. |
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g |
jednostka |
gk |
gf |
g0 |
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żebro |
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24 |
[kN/m3] |
0,4032 |
1,1 |
0,44352 |
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0,14*0,12 |
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płyta nadbetonu |
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19 |
[kN/m3] |
0,8246 |
1,1 |
0,90706 |
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0,31*0,14 |
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cegła dziurawka |
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14 |
[kN/m3] |
0,1008 |
1,1 |
0,11088 |
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tynk |
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0,015 |
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19 |
[kN/m3] |
0,08835 |
1,3 |
0,114855 |
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parkiet |
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2*(0,022*0,08) |
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5,5 |
[kN/m3 ] |
0,00002 |
1,2 |
2,3232E-05 |
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gładź cementowa |
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2*(0,01*0,08) |
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21 |
[kN/m2 ] |
0,00003 |
1,3 |
4,368E-05 |
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RAZEM |
1,42 |
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1,58 |
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qk = |
1,42 |
kN/m2. |
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q0 = |
1,58 |
kN/m2. |
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1.2. Schemat statyczny. |
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1.2.1. Żebro nr 1.1 |
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B--B |
1--1 |
C--C |
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L1 = |
5,60 |
m. |
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Leff = |
5,60 |
m. |
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q0 = |
4,23 |
kN/m2. |
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p0 = |
4,64 |
kN/m2. |
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b = |
310 |
mm |
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g0 = |
qo+po = |
8,87 |
kN/m2. |
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g0żeb = |
g0*b = |
2,75 |
kN/m |
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*momenty w przekroju |
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Mprzęs = |
1/12*q*l2= |
7,19 |
kNm |
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Mpodpor = |
-1/16*q*l= |
-5,39 |
kNm |
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*siły w przekroju |
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Qpodpor = |
7,699 |
kN |
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1.2.2. Żebro nr 2 |
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B--B |
3--3 |
C--C |
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L1 = |
5,50 |
m. |
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Leff = |
5,50 |
m. |
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q0 = |
1,58 |
kN/m2. |
żebra pod ścianką działową |
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p0 = |
4,64 |
kN/m2. |
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Pos = |
5,92 |
kN/mb |
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b = |
310 |
mm |
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Mprzęs = |
q0*b+Pos+po*(0.31-0,015) = |
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7,11 |
kN/m |
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*momenty w przekroju |
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kN/m2. |
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Mprzęs = |
1/12*q*l2= |
17,92 |
kNm |
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Mpodpor = |
-1/16*q*l= |
-13,44 |
kNm |
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*siły w przekroju |
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Qpodpor = |
19,548 |
kN |
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1.3. Stan graniczny nośności. |
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1.3.1. Żebro 1. |
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A--A |
1--1 |
B--B |
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L1 = |
5,60 |
m. |
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1.3.1.1. Przekrój 1-1 |
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b = |
310 |
mm |
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40 |
mm |
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d = |
230 |
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bw = |
70 |
mm |
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* ZGINANIE : |
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La = |
0,15*(L1+L2) |
1 680 |
mm |
beff = |
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beff = |
bw+La/5 = |
406 |
mm |
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beff > b do obliczeń przyjmuję wartość b |
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b = |
310 |
mm |
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fcd= |
10,60 |
MPa |
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Spraw czy przekrój jest pozornie czy rzeczywiście teowy. |
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Mht = |
0,85* fdc* beff * ht * ( d - 0,5h ) = |
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23,46 |
kNm |
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Msd = |
7,19 |
kNm |
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Mht = |
> |
Msd |
Przekrój jest pozornie teowy. |
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sb =Msd/(a*fcd*b*d2) |
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sb = |
0,049 |
< |
sb,lim = |
0,39 |
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z = |
0,968 |
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xeff,lim = 0.53 => |
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zlim=0,735<z |
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fd= |
350,00 |
MPa |
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AS1 =Msd/(z*fd*d) |
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As1 = |
92,22 |
mm2 |
przyjmuję stal A -III |
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Przyjęte zostało zbrojenie ze stali żebrowanej klasy A-III. |
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As1 = |
0,92 |
cm2 |
przyjmuję |
1f 16 o As1 = |
|
2,01 |
cm2 |
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zwiększono zbrojenie ze wzg. na ugięcia |
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1f = |
16 |
mm |
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1.3.1.2. Przekrój B--B ;C--C. |
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* ZGINANIE : |
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Msd = |
5,39 |
kNm |
sb,lim = |
0,39 |
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sb =Msd/(a*fcd*b*d2) |
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sb = |
0,162 |
< |
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z = |
0,88 |
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d = |
230 |
260 |
mm |
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xeff,lim = 0.53 => |
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zlim=0,735<z |
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mm |
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fyd= |
350,00 |
MPa |
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AS1 =Msd/(z*fd*d) |
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As1 = |
76,08 |
mm2 |
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Przyjęte zostało zbrojenie ze stali żebrowanej klasy A-III. |
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As1 = |
0,76 |
cm2 |
przyjmuję |
1f 16 o As1 = |
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2,01 |
cm2 |
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* ŚCINANIE : |
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a = |
45 |
stopni |
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Q= |
44,9999 |
stopni |
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Leff= |
5,60 |
m |
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VsdA--A = |
7,699 |
kN |
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VsdAkr=VsdA-qd*ai |
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qo= |
2,75 |
kN/mb |
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ai= |
0,15 |
m. |
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VsdAkr= |
7,29 |
kN |
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- współczynnik efektywności |
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n = 0,7 -fck/200 >= 0,5 |
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fck= |
16,00 |
kN/m2. |
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n = |
0,62 |
> 0,5 |
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k = 1.6 - d >= 1 |
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d = |
0,23 |
m |
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k = |
1,37 |
> 1 |
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r s2=As2/bwd |
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A s2=As1/2 |
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2,01 |
cm2 |
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rs2= |
0,0000624 |
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VRd1= [k*tRd(1,2+40r2)+0,15scp]bwd |
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tRd= |
0,22 |
N/mm2 |
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rs2= |
0,0000624 |
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scp= |
0 |
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k = |
1,37 |
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bw= |
70 |
mm |
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d = |
230 |
mm |
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VRd1= |
5,84 |
kN |
< |
VsdAkr= |
7,29 |
kN |
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Element wymagające zbrojenie na ścinanie,zbrojenie tylko strzemionami pionowymi. |
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VRd2= bw*z*n* fcd/(cotq+tanq) |
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bw= |
70 |
mm |
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d = |
230 |
mm |
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fcd= |
10,6 |
N/mm2 |
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z = 0,9 d |
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z = |
207 |
mm |
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n = |
0,62 |
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q = |
44,9999 |
stopni |
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VRd2= |
47,614 |
kN |
> |
VsdAkr= |
7,29 |
kN |
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Nie nastąpi zmiażdżenie krzyżulców betonowych. |
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Rozstaw strzemion na odcinku c1= |
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1,83 |
m |
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VsdAkr= |
7,29 |
kN |
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Przyjmuję powierzchnię zbrojenia strzemionami 2 f 5,5 mm |
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Asw1= |
0,48 |
cm2 |
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s1<=Asw1*z*fywd*cotq/Vsd |
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s1<= |
286,57 |
mm |
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Warunek normowy. |
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VRd2= |
47,61 |
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VsdA--A < |
1/5*VRd2 |
smax = |
0,8d = |
184 |
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VsdA--A < |
7,699 |
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300 |
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Przyjmuję rozstaw strzemion s1 = |
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180 |
mm |
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ilość strzemion |
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10 |
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Warunek normowy. |
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Asw1*fywd/bw*s1<= 0,5*n*fcd |
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0,800 |
N/mm2 |
< |
3,286 |
N/mm2 |
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Rozstaw strzemion w środku przęsła |
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Przyjmuję powieszchnię zbrojenia strzemionami 2 f 5,5 mm |
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Asw1= |
0,48 |
cm2 |
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Vsdc2= |
2,25 |
kN |
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s1<=Asw1*z*fywd*cotq/Vsd |
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s1<= |
925,38 |
mm |
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Warunek normowy. |
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VRd2= |
47,61 |
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Vsdc2<= |
1/5*VRd2 |
smax = |
0,8d = |
184 |
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Vsdc2= |
2,25 |
kN |
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300 |
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Przyjmuję rozstaw strzemion s1 = |
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180 |
mm |
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Warunek normowy. |
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Asw1*fywd/bw*s1<= 0,5*n*fcd |
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0,8 |
N/mm2 |
< |
3,286 |
N/mm2 |
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1.2.3. Żebro 2. |
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C--C |
2--2 |
D--D |
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L1 = |
5,50 |
m. |
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1.2.3.1. Przekrój 2- 2 |
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b = |
310 |
mm |
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hw = |
40 |
mm |
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d = |
230 |
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bw = |
140 |
mm |
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* ZGINANIE : |
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La = |
,15*(L1+L2) |
1 650 |
mm |
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beff = |
bw+La/5 = |
640 |
mm |
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beff > b do obliczeń przyjmuję wartość bw |
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xeff,lim = 0.53 => |
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zlim=0,735<z |
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beff = |
310 |
mm |
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przyjmuję beton klasy B-20 |
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fcd= |
10,60 |
Mpa |
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Spraw czy przekoj jest pozornie czy rzeczywiście teowy. |
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Mht = |
0,85* fdc* beff * ht * ( d - 0,5h ) = |
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23,462 |
kNm |
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Msd = |
17,92 |
kNm |
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xeff,lim = 0.53 => |
23,462 |
kNm |
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Mht |
> |
Msd |
Przekrój jest pozornie teowy. |
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sb =Msd/(a*fcd*b*d2) |
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sb = |
0,121 |
< |
sb,lim = |
0,39 |
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z = |
0,91 |
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fyd= |
350 |
Mpa |
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AS1 =Msd/(z*fd*d) |
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AS1 = |
244,61 |
mm2 |
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Przyjęte zostało zbrojenie ze stali żebrowanej klasy A-III. |
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AS1 = |
2,45 |
cm2 |
3 f 12 o As1 = |
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3,39 |
cm2 |
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zwiększono zbrojenie ze wzg. na ugięcia |
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3 f = |
12 |
mm |
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1.2.3.2. Przekrój B--B; C--C. |
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b = |
310 |
mm |
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hw =
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mm |
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d = |
230 |
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bw = |
140 |
mm |
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Msd = |
13,44 |
kNm |
bw = |
140 |
mm |
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sb =Msd/(a*fcd*b*d2) |
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d = |
230 |
mm |
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sb = |
0,201 |
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z = |
0,833 |
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xeff,lim = 0.53 => |
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zlim=0,735<z |
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fyd= |
350 |
Mpa |
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AS1 =Msd/(z*fd*d) |
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AS1 = |
200,41 |
mm2 |
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Przyjęte zostało zbrojenie ze stali żebrowanej klasy A-III. |
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10,6 |
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As1 = |
2,00 |
cm2 |
przyjmuję |
1 f 16 oraz 2 f 10 o As1 = |
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3,58 |
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* ŚCINANIE : |
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a = |
45 |
stopni |
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Q= |
44,9999 |
stopni |
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Leff= |
5,50 |
m. |
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VsdA--A = |
19,548 |
kN |
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VsdAkr=VsdA-qd*ai |
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qo= |
7,11 |
kN/mb |
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ai= |
0,15 |
m |
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VsdAkr= |
18,48 |
kN |
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- współczynnik efektywności |
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n = 0,7 -fck/200 >= 0,5 |
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fck= |
16,00 |
kN/m2. |
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n = |
0,62 |
> 0,5 |
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k = 1.6 - d > 1 |
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d = |
0,23 |
m |
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k = |
1,37 |
> 1 |
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r s2=As2/bw*d |
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A s2=As1/2 |
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As1= |
3,58 |
cm2 |
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rs2= |
0,000056 |
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VRd1= [k*tRd(1,2+40r2)+0,15scp]bw*d |
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tRd= |
0,22 |
N/mm2 |
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rs2= |
5,55900621118012E-05 |
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scp= |
0 |
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k = |
1,37 |
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bw= |
140 |
mm |
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d = |
230 |
mm |
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VRd1= |
11,67 |
kN |
< |
VsdAkr= |
18,48 |
kN |
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Element wymagające zbrojenie na ścinanie,zbrojenie tylko strzemionami pionowymi. |
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VRd2= bw*z*n* fcd/(cotq+tanq) |
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bw= |
140 |
mm |
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d = |
230 |
mm |
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fcd= |
10,6 |
N/mm2 |
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z = 0,9 d |
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z = |
207 |
mm |
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n = |
0,62 |
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q = |
44,9999 |
stopni |
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VRd2= |
95,228 |
kN |
> |
VsdAkr= |
18,48 |
kN |
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Nie nastąpi zmiażdżenie krzyżulców betonowych. |
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Rozstaw strzemion na odcinku c1.= |
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1,03 |
m. |
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Przyjmuję powieszchnię zbrojenia strzemionami 2 f 5,5 mm |
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Asw1= |
0,48 |
cm2 |
0,48 |
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s1<=Asw1*z*fywd*cotq/Vsd |
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VsdAkr= |
18,48 |
kN |
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s1<= |
112,99 |
mm |
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Warunek normowy. |
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VRd2= |
95,23 |
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VsdA--A < |
2/3*VRd2 |
smax = |
0,6d = |
138 |
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VsdA--A = |
19,548 |
kN |
2/3*VRd2= |
63,4855199996132 |
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300 |
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Przyjmuję rozstaw strzemion s1 = |
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100 |
mm |
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ilość strzemion |
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10 |
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Warunek normowy. |
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Asw1*fywd/bw*s1<= 0,5*n*fcd |
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0,720 |
N/mm2 |
< |
3,286 |
N/mm2 |
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Rozstaw strzemion w środku przęsła. |
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Przyjmuję powierzchnię zbrojenia strzemionami 2 f 5,5 mm |
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Asw1= |
0,48 |
cm2 |
0,48 |
5,5 |
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Vsdc2= |
11,16 |
kN |
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s1<=Asw1*z*fywd*cotq/Vsd |
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s1<= |
187,12 |
mm |
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Warunek normowy. |
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VRd2= |
95,23 |
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VsdA--A < |
1/5*VRd2 |
smax = |
0,8d = |
184 |
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Vsdc2= |
11,16 |
kN |
1/5*VRd2= |
19,045655999884 |
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300 |
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Przyjmuję rozstaw strzemion s1 = |
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120 |
mm |
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Warunek normowy. |
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Asw1*fywd/bw*s1<= 0,5*n*fcd |
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0,600 |
N/mm2 |
< |
3,29 |
N/mm2 |
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2.4. S.G.U. |
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2.4.1. Żebro nr 1. |
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2.4.1.1.Sprawdzenie granicznych wartości ugięć . |
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a(Ą,to) |
Ł |
alim |
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a(Ą,to) = ak*(Msd*Leff2)/B(u,to) |
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qk = |
3,75 |
kN/m2 |
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pk = |
2,50 |
kN/m2 |
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Qk = |
0,99 |
kN/m2 |
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gk = |
( qk+pk+Qk)*0,31 |
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gk = |
2,24 |
kN/m |
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Leff = |
5,50 |
m |
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MA,B = |
1/16*q*l2 = |
4,24 |
kNm |
Na podstawie literatury Kobiak, Stachurski |
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Mprzęs = |
1/12*q*l2 = |
5,66 |
kNm |
"Konstrukcje betonowe". |
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ak = |
5 * ( 1+( MA+MB ) / 10Mprze ) / 48 = |
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0,120 |
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Blim(Ą,to) = (Ec,eff*JII*J)/(1-b1*b2*(dst1/ds)2(1-JII/J) |
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Ec,eff =Ecm/(1+f) |
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Ecm= |
27,5 |
kN/mm2 |
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tab 2 |
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f = |
3,164 |
(końcowy współczynnik pełzania) |
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tab 3 |
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Ec,eff = |
6,60 |
kN/mm2 |
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b 1 = |
1,0 |
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b 2 = |
0,5 |
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dst1/ds=Msr/Msd |
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h= |
260 |
d = |
230 |
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Msr=fctm*W |
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W = b*h2/6 |
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W = |
788666,666666667 |
mm3 |
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fctm= |
1,9 |
N/mm2 |
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Msr= |
1,50 |
kNm |
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Msd = |
5,66 |
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b = |
70 |
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dst1/ds= |
Msr/Msd = |
0,26 |
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J = bh3/12 + As*ae*(d-b/2)2 |
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JII = bxeff3/12 + b*xeff*(h/2-xeff/2)2 + As*ae(d-h/2)2 |
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h = |
260 |
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Xeff = d*x |
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x |
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d = |
230 |
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sb = |
0,049 |
xeff,lim = 0.53 => zlim= 0,735 < z |
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x = |
0,968 |
< xeff,lim = 0.53 |
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Xeff = |
222,64 |
mm |
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ae =Es/Ec,eff |
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Ec,eff = |
6,60 |
kN/mm2 |
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Es = |
200 |
kN/mm2 |
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ae = |
30,28 |
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As = |
201 |
mm2 |
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JI = |
1,634E+08 |
mm4 |
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JII = |
130684660,231602 |
mm4 |
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Blim(Ą,to) = |
869177272127,04 |
kN/mm2 |
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a(Ą,to) = |
23,58 |
mm |
Wartości ugięć zostały przekroczone |
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a(Ą,to) |
Ł |
alim = |
30 |
mm |
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1.4.1.1.Sprawdzenie granicznych wartości rys prostopadłtch . |
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wk =b*sRM*eSM |
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b = |
1,3 |
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SRM =50+0,25*k1*k2*B399/rr |
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k1 = |
0,8 |
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k2 = |
0,5 |
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f = |
16 |
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rr =As/Ac,eff |
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As = |
201 |
mm2 |
h = |
260 |
mm |
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Ac,eff =2,5*(h-d)*b |
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d = |
230 |
mm |
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Ac,eff = |
5250 |
mm2 |
b = |
70 |
mm |
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rr = |
0,038 |
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SRM = |
91,79 |
mm |
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b1 = |
1,00 |
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b2 = |
0,50 |
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dst1/ds= |
Msr/Msd |
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Mprzęs = |
1/12*q*l2 = |
4,24 |
kNm |
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Msr=fctm*W |
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W = b*h2/6 |
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W = |
788666,666666667 |
mm3 |
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fctm= |
1,9 |
N/mm2 |
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Msr= |
1,498 |
kNm |
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eSM =ss/Es * [1-b1*b2 (ssr/ss)2 ] |
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dst1/ds= |
Msr/Msd= |
0,35 |
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ds =fyd= |
350,00 |
Mpa |
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eSM = |
0,00164 |
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wk = |
0,1958 |
mm < wk,lim = 0,3 mm |
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1.4.1.3.Sprawdzenie granicznych wartości rys ukośnych. |
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wk = |
4t2l/(rw*Es*fck) |
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fck= |
16,00 |
N/mm2. |
d = |
230 |
mm |
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Vsdkr = |
7,29 |
kN |
b = |
70 |
mm |
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t =Vsdkr/(b*d) |
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b1 = |
0,7 |
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t = |
0,453 |
N/mm2. |
b2 = |
0,7 |
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l=1/[3*(rw1/b1*f1)+(rw2/b2*f3 |
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rw1 =Aw1/(s1*bw) |
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s1 = |
180 |
mm |
f = |
5 |
mm |
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Aw1 = |
48 |
mm2 |
Es = |
2,00E+05 |
N/mm2 |
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rw1 = |
0,004 |
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fck= |
16,00 |
N/mm2 |
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rw2 = |
0 |
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l= |
306,25 |
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wk = |
0,020585060704156 |
mm |
< wk,lim = 0,3 mm |
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2.5.3. Żebro nr2. |
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1.4.3.1.Sprawdzenie granicznych wartości ugięć . |
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a(Ą,to) = ak*(Msd*Leff2)/B(u,to) |
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a |
Ł |
alim |
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qk = |
1,42 |
kN/m2. |
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b = |
310 |
mm |
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pk = |
2,50 |
kN/m2. |
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Pk = |
4,56 |
kN/m. |
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gkżeb = |
qk*b+Pks+pk*(0,31-,015) |
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gk = |
5,73 |
kN/m. |
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Leff = |
6,00 |
m. |
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MA,B = |
1/16*q*l2 = |
12,9 |
kNm |
Na podstawie literatury Kobiak, Stachurski |
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Mprzęs = |
1/12*q*l2 = |
17,2 |
kNm |
"Konstrukcje betonowe". |
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ak = |
5*(1+(MA+MB)/10Mprze) / 48 = |
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0,120 |
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Blim(Ą,to) = (Ec,eff*JII*J)/(1-b1*b2*(dst1/ds)2(1-JII/J) |
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Ec,eff =Ec/(1+f) |
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Ec= |
27,5 |
kN/mm2 |
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tab 2 |
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f = |
3,055 |
(końcowy współczynnik pełzania) |
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tab 3 |
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Ec,eff = |
6,78 |
kN/mm2 |
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b 1 = |
1,0 |
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b 2 = |
0,5 |
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h= |
260 |
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d = |
230 |
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dst1/ds= |
Msr/Msd |
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Msr=fctm*W |
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140 |
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W = b*h2/6 |
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W = |
1577333,33333333 |
mm3 |
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fctm= |
1,9 |
N/mm2 |
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Msr= |
3,00 |
kNm |
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b = |
140 |
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dst1/ds= |
Msr/Msd= |
0,17 |
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J = bh3/12 + As*ae*(d-b/2)2 |
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JII = bxeff3/12 + b*xeff*(h/2-xeff/2)2 + As*ae(d-h/2)2 |
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h = |
260 |
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Xeff = d*x |
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x |
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d = |
230 |
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sb = |
0,121 |
xeff,lim = 0.53 => zlim= 0,735 < z |
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x = |
0,158 |
< xeff,lim = 0.53 |
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Xeff = |
36,34 |
mm |
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ae =Es/Ec,eff |
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Es = |
200 |
kN/mm2 |
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ae = |
29,49 |
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x |
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As = |
339 |
mm2 |
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JI = |
305027515,151515 |
mm4 |
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JII = |
164159335,956368 |
mm4 |
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Blim(Ą,to) = |
1121146182354,85 |
kN/mm2 |
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a(Ą,to) = |
66,17 |
mm |
Wartości ugięć zostały przekroczone. |
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a(Ą,to) |
Ł |
alim = |
30 |
mm |
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1.4.3.2.Sprawdzenie granicznych wartości rys prostopadłtch . |
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wk =b*SRM*eSM |
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b = |
1,30 |
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SRM =50+0,25*k1*k2*f/rr |
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k1 = |
0,8 |
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k2 = |
0,5 |
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f = |
12 |
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rr =As/Ac,eff |
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As = |
339 |
mm2 |
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Ac,eff = |
2,5*(h-d)*b |
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h = |
260 |
mm |
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Ac,eff = |
10500 |
mm2 |
d = |
230 |
mm |
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rr = |
0,032 |
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b = |
140 |
mm |
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SRM = |
87,17 |
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b1 = |
1,00 |
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b2 = |
0,50 |
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Mprzęs = |
1/12*q*l2 = |
17,2 |
kNm |
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dst1/ds= |
Msr/Msd= |
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Msr=fctm*W |
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W = b*h2/6 |
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W = |
1577333,33333333 |
mm3 |
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fctm= |
1,9 |
N/mm2 |
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Msr= |
2,997 |
kNm |
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eSM =ss/Es * [1-b1*b2 (ssr/ss)2 ] |
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dst1/ds= |
Msr/Msd= |
0,17 |
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ds =fyd = |
350,00 |
Mpa |
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eSM = |
0,00172 |
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wk = |
0,1953 |
mm < wk,lim = 0,3 mm |
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1.4.1.3.Sprawdzenie granicznych wartości rys ukośnych. |
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wk = |
4t2l/(rw*Es*fck) |
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fck= |
16,00 |
N/mm2. |
d = |
230 |
mm |
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Vsdkr = |
18,48 |
kN |
b = |
140 |
mm |
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t =Vsdkr/(b*d) |
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b1 = |
0,7 |
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t = |
0,574 |
N/mm2. |
b2 = |
0,7 |
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l=1/[3*(rw1/b1*f1)+(rw2/b2*f3 |
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rw1 =Aw1/(s1*bw) |
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s1 = |
100 |
mm |
f = |
5,5 |
mm |
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Aw1 = |
48 |
mm2 |
Es = |
2,00E+05 |
N/mm2 |
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rw1 = |
0,003 |
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fck= |
16,00 |
N/mm2 |
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rw2 = |
0 |
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l= |
374,306 |
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wk = |
0,04496 |
mm < wk,lim = 0,3 mm |
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2. Podciąg . |
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2.1. Zestawienie obciążeń . |
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Qo = |
1,1*4,18*5,75 |
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L = ( 5,5+6 ) / 2 = 5,75 m |
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Po = |
1,2*4,37*5,75 |
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Cp = |
0,3*0,7*25*1,1+0,03*0,3*19*1,1 |
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Csp= |
0,25*3,3*14+0,03*19*3,3 |
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
przęsło skrajne |
|
|
L1 = |
5,600 |
m |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
przęsło drugie |
|
|
L2 = |
5,500 |
m |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
przęsło środkowe |
|
|
L3 = |
5,500 |
m |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ciężar stropu |
|
|
Qo = |
29,170 |
kN/mb |
Qtot = |
Qo + Cp+Csp |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-0,141 |
-0,141 |
|
|
|
|
obciążenia zmienne |
|
|
Po = |
33,290 |
kN/mb |
Qtot = |
48,376 |
kN/mb |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-0,106 |
|
|
|
|
ciężar podciągu |
|
|
Cp = |
5,775 |
kN/mb |
Po = |
30,153 |
kN/mb |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-0,106 |
|
|
|
|
ścianka dzialowa na podciągu |
|
|
Csp= |
13,431 |
kN/mb |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
|
|
2.2.Zestawienie sił wewnętrznych. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
żebro ze scianka działową |
|
|
P. = |
0,000 |
kN/mb |
|
Wykonano oblczeń na podstawie tablic Winklera. |
|
|
|
|
|
|
|
|
x |
L |
MQmax |
MQmin |
QQmax |
QQmin |
|
przęslo skrajne |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[ m. ] |
[ kNm ] |
[ kNm ] |
[ kN ] |
[ kN ] |
x |
a |
b |
c |
alfa |
beta |
gamma |
|
|
|
|
MP. |
QP |
|
|
|
|
Przęsło skrajne. |
|
L |
Mmax |
Mmin |
Qmax |
Qmin |
|
|
|
0,000 |
0,000 |
0,000 |
0,000 |
190,333 |
97,121 |
0,000 |
0,000 |
0,000 |
0,000 |
0,395 |
0,447 |
-0,053 |
|
|
|
|
|
|
|
|
|
|
|
|
[ m. ] |
[ kNm ] |
[kNm ] |
[ kN ] |
[ kN ] |
|
|
|
0,100 |
0,560 |
93,785 |
46,806 |
145,774 |
68,837 |
0,100 |
0,035 |
0,040 |
-0,005 |
0,295 |
0,354 |
-0,059 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,000 |
0,00 |
0,000 |
190,333 |
97,121 |
|
|
|
0,200 |
1,120 |
161,912 |
78,394 |
103,565 |
38,223 |
0,200 |
0,059 |
0,070 |
-0,011 |
0,195 |
0,273 |
-0,078 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,560 |
93,78 |
46,806 |
145,774 |
68,837 |
|
|
|
0,300 |
1,680 |
195,080 |
94,858 |
63,667 |
5,316 |
0,300 |
0,073 |
0,080 |
-0,016 |
0,095 |
0,204 |
-0,109 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,120 |
161,91 |
78,394 |
103,565 |
38,223 |
|
|
|
0,400 |
2,240 |
221,429 |
96,152 |
25,987 |
-29,847 |
0,400 |
0,078 |
0,099 |
-0,021 |
-0,005 |
0,147 |
-0,152 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,680 |
195,08 |
94,858 |
63,667 |
5,316 |
|
|
|
0,500 |
2,800 |
212,876 |
82,379 |
16,107 |
-41,424 |
0,500 |
0,072 |
0,099 |
-0,026 |
-0,011 |
0,102 |
-0,207 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,240 |
221,43 |
96,152 |
25,987 |
-29,847 |
|
|
|
0,600 |
3,360 |
189,941 |
53,180 |
-43,145 |
-106,362 |
0,600 |
0,057 |
0,099 |
-0,032 |
-0,205 |
0,067 |
-0,272 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,800 |
212,88 |
82,379 |
16,107 |
-41,424 |
|
|
|
0,700 |
3,920 |
118,683 |
9,275 |
-74,896 |
-147,434 |
0,700 |
0,031 |
0,068 |
-0,037 |
-0,305 |
0,042 |
-0,347 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
3,360 |
189,94 |
53,180 |
-43,145 |
-106,362 |
|
|
|
0,800 |
4,480 |
33,404 |
-50,532 |
-105,007 |
-190,128 |
0,800 |
-0,004 |
0,038 |
-0,042 |
-0,405 |
0,026 |
-0,431 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
3,920 |
118,68 |
9,275 |
-74,896 |
-147,434 |
|
|
|
0,900 |
5,040 |
-56,294 |
-146,389 |
-133,738 |
-234,239 |
0,900 |
-0,050 |
0,018 |
-0,068 |
-0,505 |
0,017 |
-0,522 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
4,480 |
33,40 |
-50,532 |
-105,007 |
-190,128 |
|
|
|
1,000 |
5,600 |
-144,982 |
-282,387 |
-161,295 |
-279,487 |
1,000 |
-0,105 |
0,014 |
-0,120 |
-0,605 |
0,014 |
-0,620 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
5,040 |
-56,29 |
-146,389 |
-133,738 |
-234,239 |
|
|
|
|
L |
Mmax |
Mmin |
Qmax |
Qmin |
|
przęslo drugie |
|
|
|
|
|
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
5,600 |
-145,0 |
-282,387 |
-161,295 |
-279,487 |
|
|
|
|
[ m. ] |
[ kNm ] |
[ kNm ] |
[ kN ] |
[ kN ] |
x |
a |
b |
c |
alfa |
beta |
gamma |
|
|
|
|
P. |
|
|
|
|
|
Przęsło drugie. |
|
L |
Mmax |
Mmin |
Qmax |
Qmin |
|
|
|
0,000 |
0,000 |
-144,982 |
-282,387 |
249,541 |
126,885 |
0,000 |
-0,105 |
0,014 |
-0,120 |
0,526 |
0,598 |
-0,072 |
|
|
|
|
[ kN ] |
|
|
|
|
|
|
|
[ m. ] |
[ kNm ] |
[kNm ] |
[ kN ] |
[ kN ] |
|
|
|
0,100 |
0,550 |
-70,192 |
-156,494 |
205,302 |
99,601 |
0,100 |
-0,058 |
0,014 |
-0,072 |
0,426 |
0,502 |
-0,076 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,000 |
-145,0 |
-282,387 |
249,541 |
126,885 |
|
|
|
0,200 |
1,100 |
0,943 |
-79,619 |
162,638 |
70,742 |
0,200 |
-0,020 |
0,030 |
-0,050 |
0,326 |
0,414 |
-0,088 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,550 |
-70,19 |
-156,494 |
205,302 |
99,601 |
|
|
|
0,300 |
1,650 |
67,817 |
-37,920 |
121,804 |
40,052 |
0,300 |
0,008 |
0,056 |
-0,049 |
0,226 |
0,336 |
-0,110 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,100 |
0,94 |
-79,619 |
162,638 |
70,742 |
|
|
|
0,400 |
2,200 |
110,133 |
-10,710 |
82,985 |
7,349 |
0,400 |
0,025 |
0,073 |
-0,047 |
0,126 |
0,270 |
-0,143 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,650 |
67,82 |
-37,920 |
121,804 |
40,052 |
|
|
|
0,500 |
2,750 |
127,599 |
1,721 |
46,290 |
-27,461 |
0,500 |
0,033 |
0,079 |
-0,046 |
0,026 |
0,215 |
-0,188 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,200 |
110,13 |
-10,710 |
82,985 |
7,349 |
|
|
|
0,600 |
3,300 |
120,462 |
-0,381 |
11,828 |
-64,431 |
0,600 |
0,031 |
0,075 |
-0,045 |
-0,074 |
0,172 |
-0,245 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,750 |
127,60 |
1,721 |
46,290 |
-27,461 |
|
|
|
0,700 |
3,850 |
35,399 |
-70,338 |
-20,747 |
-104,477 |
0,700 |
-0,018 |
0,062 |
-0,043 |
-0,174 |
0,139 |
-0,318 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
3,300 |
120,46 |
-0,381 |
11,828 |
-64,431 |
|
|
|
0,800 |
4,400 |
33,027 |
-49,650 |
-51,236 |
-144,523 |
0,800 |
-0,004 |
0,039 |
-0,043 |
-0,274 |
0,118 |
-0,392 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
3,850 |
35,40 |
-70,338 |
-20,747 |
-104,477 |
|
|
|
0,900 |
4,950 |
-25,363 |
-118,613 |
-79,967 |
-187,315 |
0,900 |
-0,037 |
0,028 |
-0,065 |
-0,374 |
0,106 |
-0,480 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
4,400 |
33,03 |
-49,650 |
-51,236 |
-144,523 |
|
|
|
1,000 |
5,500 |
-82,933 |
-227,441 |
-107,196 |
-231,609 |
1,000 |
-0,079 |
0,032 |
-0,111 |
-0,474 |
0,103 |
-0,577 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
4,950 |
-25,36 |
-118,613 |
-79,967 |
-187,315 |
|
|
|
|
L |
Mmax |
Mmin |
Qmax |
Qmin |
|
pręslo środkowe |
|
|
|
|
|
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
5,500 |
-82,93 |
-227,441 |
-107,196 |
-231,609 |
|
|
|
|
[ m. ] |
[ kNm ] |
[ kNm ] |
[ kN ] |
[ kN ] |
x |
a |
b |
c |
alfa |
beta |
gamma |
|
|
|
|
|
|
|
|
|
|
Przęsło środkowe. |
|
L |
Mmax |
Mmin |
Qmax |
Qmin |
|
|
|
0,000 |
0,000 |
-82,933 |
-227,441 |
241,225 |
116,391 |
0,000 |
-0,079 |
0,032 |
-0,111 |
0,500 |
0,591 |
-0,091 |
|
|
|
|
|
|
|
|
|
|
|
|
[ m. ] |
[ kNm ] |
[kNm ] |
[ kN ] |
[ kN ] |
|
|
|
0,100 |
0,550 |
-20,103 |
-113,353 |
196,949 |
89,143 |
0,100 |
-0,034 |
0,029 |
-0,063 |
0,400 |
0,494 |
-0,094 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,000 |
-82,93 |
-227,441 |
241,225 |
116,391 |
|
|
|
0,200 |
1,100 |
43,502 |
-39,175 |
154,212 |
60,357 |
0,200 |
0,001 |
0,042 |
-0,041 |
0,300 |
0,406 |
-0,106 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
0,550 |
-20,10 |
-113,353 |
196,949 |
89,143 |
|
|
|
0,300 |
1,650 |
104,154 |
-1,583 |
113,250 |
29,796 |
0,300 |
0,026 |
0,066 |
-0,040 |
0,200 |
0,328 |
-0,128 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,100 |
43,50 |
-39,175 |
154,212 |
60,357 |
|
|
|
0,400 |
2,200 |
141,210 |
20,367 |
74,285 |
-2,762 |
0,400 |
0,041 |
0,081 |
-0,040 |
0,100 |
0,260 |
-0,160 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
1,650 |
104,15 |
-1,583 |
113,250 |
29,796 |
|
|
|
0,500 |
2,750 |
153,562 |
27,684 |
37,443 |
-37,443 |
0,500 |
0,046 |
0,086 |
-0,040 |
0,000 |
0,205 |
-0,205 |
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,200 |
141,21 |
20,367 |
74,285 |
-2,762 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0,000 |
0,000 |
|
|
|
|
|
|
2,750 |
153,56 |
27,684 |
37,443 |
-37,443 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.3. Obliczenie nośności na zginanie i obliczenie zbrojenia . |
|
|
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|
|
|
|
|
|
2.3.1. Przęsło skrajne . |
|
|
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|
|
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|
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|
|
* ZGINANIE : |
|
|
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|
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|
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|
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|
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|
|
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|
|
beff = |
300,000 |
mm |
|
|
|
|
|
|
|
|
|
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|
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|
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|
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|
|
|
przyjmuję beton klasy B-20 |
|
|
|
|
|
|
|
|
|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fcd= |
10,600 |
Mpa |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.3.2. Ustalenie zbrojenia w przęśle. |
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Msd = |
221,429 |
kNm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
sb =Msd/(afcdbd2) |
|
|
|
|
h = |
700,000 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
d = |
650,000 |
mm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
sb = |
0,194 |
< |
sb,lim = |
0,390 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
z = |
0,882 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
przyjmuję stal A -III |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
AS1 =Msd/(zfydd) |
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b= |
300,000 |
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fyd = |
350,000 |
Mpa |
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AS1 = |
1103,531 |
mm2 |
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As1 = |
11,035 |
cm2 |
przyjmuję |
6f 16 o As1 = |
|
12,060 |
cm2 |
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6f = |
12,060 |
cm2 |
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2.3.3. Obliczenie zbrojenia w 1/4 i 3/4 od podpory A . |
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Msd = |
189,940 |
kNm |
w 1/4 od A |
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sb =Msd/(afcdbd2) |
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sb = |
0,166 |
< |
sb,lim = |
0,390 |
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z = |
0,907 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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AS1 = |
920,508 |
mm2 |
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Msd = |
79,950 |
kNm |
w 3/4 od A |
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sb =Msd/(afcdbd2) |
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sb = |
0,070 |
< |
sb,lim = |
0,390 |
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z = |
0,963 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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AS1 = |
364,931 |
mm2 |
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2.3.4. Podpora B . |
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Msd = |
282,387 |
kNm |
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sb =Msd/(afcdbd2) |
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d = |
650,000 |
mm |
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sb = |
0,247 |
< |
sb,lim = |
0,390 |
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z = |
0,843 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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fyd = |
350,000 |
Mpa |
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AS1 = |
1472,435 |
mm2 |
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As1 = |
14,724 |
cm2 |
przyjmuję |
8f 16 o As1 = |
|
16,080 |
cm2 |
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8f = |
16,080 |
cm2 |
|
296 |
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2.3.5. Przęsło drugie . |
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Msd = |
127,599 |
kNm |
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sb =Msd/(afcdbd2) |
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sb = |
0,112 |
< |
sb,lim = |
0,390 |
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z = |
0,934 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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AS1 = |
600,509 |
mm2 |
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As1 = |
6,005 |
cm2 |
przyjmuję |
4f 16 o As1 = |
|
8,400 |
cm2 |
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4f = |
8,400 |
mm |
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|
2.3.6. Obliczenie zbrojenia w 1/4 i 3/4 od podpory B . |
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|
Msd = |
59,465 |
kNm |
w 1/4 od A |
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sb =Msd/(afcdbd2) |
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|
sb = |
0,052 |
< |
sb,lim = |
0,390 |
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|
|
z = |
0,973 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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AS1 = |
268,638 |
mm2 |
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|
Msd = |
65,400 |
kNm |
w 3/4 od A |
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sb =Msd/(afcdbd2) |
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sb = |
0,057 |
< |
sb,lim = |
0,390 |
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|
z = |
0,970 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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|
AS1 = |
296,363 |
mm2 |
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2.3.7. Podpora C . |
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Msd = |
227,441 |
kNm |
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sb =Msd/(afcdbd2) |
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sb = |
0,199 |
< |
sb,lim = |
0,390 |
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|
z = |
0,875 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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AS1 =Msd/(zfdd) |
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AS1 = |
1142,561 |
mm2 |
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|
As1 = |
11,426 |
cm2 |
przyjmuję |
7f 16 o As1 = |
|
14,070 |
cm2 |
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7f = |
14,070 |
cm2 |
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2.3.8. Przęsło trzecie . |
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|
Msd = |
153,562 |
kNm |
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|
sb =Msd/(afcdbd2) |
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|
sb = |
0,134 |
< |
sb,lim = |
0,390 |
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|
|
z = |
0,919 |
|
xeff,lim = 0.53 => |
|
zlim= 0,735 < z |
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|
AS1 =Msd/(zfdd) |
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|
AS1 = |
734,491 |
mm2 |
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|
As1 = |
7,345 |
cm2 |
przyjmuję |
5f 16 o As1 = |
|
10,050 |
cm2 |
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|
5f = |
10,050 |
cm2 |
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|
3.4. Obliczenie nośności na ścinanie . |
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|
3.4.1. Określenie nośności na ścinanie ze względu na zmiażdżenie krzyżulców betonowych |
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|
przy zbrojeniu tylko strzemionami pionowymi . |
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a = |
45,000 |
stopni |
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Q= |
45,000 |
stopni |
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VRd2= bwzn fcd/(cotq+tanq) |
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n = 0,7 -fck/200 >= 0,5 |
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n = |
0,620 |
> 0,5 |
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fck= |
16,000 |
kN/m2. |
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d = |
650,000 |
mm |
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z = 0,9 d = |
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585,000 |
mm |
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bw = |
300,000 |
mm |
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VRd2= |
576,693 |
kN |
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3.4.1.2.Określenie nośności na ścinanie ze względu na zmiażdzenie krzyżulców betonowych |
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przy zbrojeniu strzemionami i prętami odgiętymi . |
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VRd2= bwzn fcd*(cotq+cota)/(1+cot2q) |
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VRd2= |
1153,386 |
kN |
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VRd2 > Qmax |
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2.4.2. Określenie sił krawędziowych . |
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VsdAkr= |
186,400 |
kN |
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VsdBkr,L= |
272,293 |
kN |
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VsdBkr,P= |
243,019 |
kN |
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VsdCkr,L= |
225,560 |
kN |
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VsdCkr,P= |
235,335 |
kN |
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2.4.3. Na strzemiona przyjmuję pręty o śr. 8mm, ze stali A-I czterocięte. |
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2.4.3.1.Obliczenie rozstawu strzemion w przęśle skrajnym przy podporze A. |
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Założono że strzemiona przenoszą ponad 50% siły ścinającej. |
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VsdAkr= |
186,400 |
kN |
1/2 Vsd = |
93,200 |
kN |
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Asw1= |
201,000 |
mm2 |
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fywd= |
210,000 |
N/mm2 |
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s1<=Asw1zfywdcotq/Vsd3 |
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s1<= |
245,700 |
mm |
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Przyjeto rozstaw strzemion |
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s1= |
200,000 |
mm |
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Siła przenoszona przez strzemiona. |
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VRd3= Asw z fywd cotq / s |
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VRd3= |
127,64 |
kN |
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2.4.4.1. Przyjęto że pozostałą część siły przenoszą pręty odgięte. |
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Prętami odgiętymi zbroimy na odlęgłość c1 = |
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1240,000 |
mm |
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Siła na końcu prętów odgiętych |
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Vsd , c1 = |
98,500 |
kN |
< |
VRd3= |
127,643 |
kN |
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Pierwsze odgięcie. |
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Siła przenoszona przez pręty odgięte. |
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Vsd , pr = Vsdkr - VRd3 |
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Vsd , pr = |
58,757 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
125,859 |
mm2 |
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Przyjęto w pierwszym odgięciu |
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1f 16 o As1 = |
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201,000 |
mm2 |
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Drugie odgięcie. |
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Vsd pr1 = |
139,280 |
kN |
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Vsd , pr = Vsdkr - VRd3 |
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Vsd , pr = |
11,637 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
24,927 |
mm2 |
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Przyjęto w drugim odgięciu |
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1f 16 o As1 = |
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201,000 |
mm2 |
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2.4.4.1.Obliczenie rozstawu strzemion w przęśle skrajnym przy podporze B ( z lewej ). |
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2.4.6.Obliczenie rozstawu strzemion na odcinku1,3---1,9 m. od podpory . |
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Założono że strzemiona przenoszą ponad 50% siły ścinającej. |
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Asw1= |
202,000 |
mm2 |
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VsdBkr= |
272,293 |
kN |
1/2 Vsd = |
136,147 |
kN |
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fywd= |
210,000 |
N/mm2 |
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Asw1= |
201,000 |
mm2 |
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Vsd = |
93,200 |
kN |
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fywd= |
210,000 |
N/mm2 |
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s1<=Asw1zfywdcotq/Vsd |
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s1<=Asw1zfywdcotq/Vsd3 |
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s1<= |
266,263 |
mm |
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s1<= |
181,370 |
mm |
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s1= |
120,000 |
mm |
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Przyjeto rozstaw strzemion |
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s1= |
170,000 |
mm |
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2.4.6.Obliczenie przekroju zbrojenia prętami odgiętymi. |
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Siła przenoszona przez strzemiona. |
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Vsdc2= |
VsdBkr,P-Vsd2 |
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VRd3= Asw z fywd cotq / s |
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Vsdc2= |
#REF! |
kN |
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VRd3= |
145,25 |
kN |
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s2 = |
1300/2 = |
650,000 |
mm |
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Przyjęto że pozostałą część siły przenoszą pręty odgięte. |
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Asw2=>Vsd*s2/(z*fywd*(cotQ+cota)*sina) |
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Prętami odgiętymi zbroimy na odlęgłość c1 = |
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1740,000 |
mm |
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Pierwsze odgięcie. |
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Asw2= |
#REF! |
cm2 |
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Vsd , c1 = |
146,560 |
kN |
< |
VRd3= |
145,252 |
kN |
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Wystarczy tylko dwa pręty montażowe . |
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Siła przenoszona przez pręty odgięte. |
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Vsd , pr = Vsdkr - VRd3 |
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Vsd , pr1 = |
127,041 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
272,126 |
mm2 |
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Przyjęto w pierwszym odgięciu |
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2f 16 o As1 = |
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402,000 |
mm2 |
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Drugie odgięcie. |
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Vsdp1 = |
231,000 |
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Vsd , pr2 = Vsdp1 - VRd3 |
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Vsd , pr2 = |
85,748 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
183,675 |
mm2 |
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Przyjęto w drugim odgięciu |
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1f 16 o As1 = |
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201,000 |
mm2 |
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Trzecie odgięcie. |
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Vsdp2 = |
188,000 |
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Vsd , pr2 = Vsdp1 - VRd3 |
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Vsd , pr2 = |
42,748 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
91,567 |
mm2 |
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Przyjęto w drugim odgięciu |
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1f 16 o As1 = |
|
201,000 |
mm2 |
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Przyjęto zagęszczony rozstaw strzemion na odcinku 2400 mm od podpory |
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B ( w lewą stronę ). |
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2.4.4.1.Obliczenie rozstawu strzemion w przęśle skrajnym przy podporze B ( z prawej ). |
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Założono że strzemiona przenoszą ponad 50% siły ścinającej. |
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VsdBkr= |
243,019 |
kN |
1/2 Vsd = |
121,510 |
kN |
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Asw1= |
201,000 |
mm2 |
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fywd= |
210,000 |
N/mm2 |
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s1<=Asw1zfywdcotq/Vsd3 |
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s1<= |
203,217 |
mm |
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Przyjeto rozstaw strzemion |
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s1= |
180,000 |
mm |
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Siła przenoszona przez strzemiona. |
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VRd3= Asw z fywd cotq / s |
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VRd3= |
137,18 |
kN |
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Przyjęto że pozostałą część siły przenoszą pręty odgięte. |
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Prętami odgiętymi zbroimy na odlęgłość c1 = |
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1240,000 |
mm |
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Vsd , c1 = |
158,430 |
kN |
< |
VRd3= |
137,183 |
kN |
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Pierwsze odgięcie. |
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Siła przenoszona przez pręty odgięte. |
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Vsd , pr = Vsdkr - VRd3 |
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Vsd , pr = |
105,837 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
226,705 |
mm2 |
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Przyjęto w pierwszym odgięciu |
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2f 16 o As1 = |
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402,000 |
mm2 |
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Drugie odgięcie. |
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Vsd pr1 = |
207,530 |
kN |
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Vsd , pr = Vsdkr - VRd3 |
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Vsd , pr = |
70,348 |
kN |
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Asw1=VRd3 s/ (z fywd (cotq + cot a ) sin a) |
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Asw1= |
150,687 |
mm2 |
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Przyjęto w drugim odgięciu |
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1f 16 o As1 = |
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201,000 |
mm2 |
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Przyjęto zagęszczony rozstaw strzemion na odcinku 2000 mm od podpory |
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B ( w prawą stronę ). |
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Rozstaw strzemion oraz prętów odgiętych przy podporze C z obu stron |
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przyjęto jak przy podporze B z prawej strony ze względu na podobne |
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wartości sił przekrojoywch. |
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2.5. Sprawdzenie SGU w przęśle skrajnym ( M jest max ) . |
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2.5.1. Sprawdzenie rozwarcia rys prostopadłych . |
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d s =Msd/r*d*As |
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qk = |
3,75 * 5,75+0,3*0,6*25 = |
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26,063 |
kN/mb |
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pk = |
(2,5+0,75)*5,75 = |
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18,688 |
kN/mb |
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Msd = |
a*qk*l*l + b*pk*l*l = |
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128,232 |
kNm |
b = |
300,000 |
mm |
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r = |
As/ (b*d) |
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d = |
650,000 |
mm |
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r = |
0,62% |
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0,850 |
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d s = |
192,449 |
Mpa |
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Według PrPN-B-03264 można przyjmować pręty o średnicy do 25 mm |
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Ponieważ przyjęto pręty o średnicy 16mm to warunek ten jest spełniony . |
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2.5.2. Sprawdzenie rozwarcia rys ukośnych . |
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K > 1/fck*(r1 +r2)*[rw1/b1f1+ rw2/b1f2] |
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fck= |
16,000 |
Mpa |
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b1 = |
1,000 |
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asw1 = |
202,000 |
mm2 |
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s1 = |
200,000 |
mm |
f = |
8,000 |
mm |
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r1 = |
asw1/s1*bw = |
0,003 |
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r2 = |
asw2/s2*bw*sina = |
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asw2= |
201 |
mm2 |
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r2 = |
0,002 |
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K = |
1,705E-07 |
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Vsd = |
186,400 |
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VRd2= |
576,693 |
kN |
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Vsd/Vrd = |
0,323 |
przy w lim = 0,3mm => K = |
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0,640 |
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Warunek jest spełniony . |
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2.5.3. Sprawdzenie ugięcia. |
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Leff/d = |
6000/650= |
9,23 |
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Msd = |
128,232 |
kNm |
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ds =Msd/z*d*As |
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z = |
0,940 |
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0,112 |
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ds = |
174,02 |
Mpa |
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d = |
650,000 |
mm |
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250/ds = |
1,44 |
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As = |
1206,000 |
mm2 |
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Leff/d*250/ds = |
13,261 |
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As / b*d = |
0,62% |
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Według PrPN-B-03264 warunek jest spełniony. |
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Ponieważ dopuszczalna wartość Leff/d wynosi max. 24 |
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3. Słup. |
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3.1. Zestawienie obciążeń. |
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a.obciążenia od dachu stałe + . |
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Obciążenie śniegiem ( II strefa ). |
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Qk = |
0,700 |
[kN/m2] |
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a = |
11,000 |
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b = |
5,750 |
m. |
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C = 1,2*(60-a) / 30 = |
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1,960 |
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Sk =Qk*C = |
1,372 |
[kN/m2] |
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a = |
6,000 |
m. |
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g |
grubość |
gk |
gf |
g0 |
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[kN/m3] |
[m.] |
[kN/m2] |
------------- |
[kN/m2] |
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papa gr 20 mm |
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22,000 |
0,020 |
0,440 |
1,300 |
0,572 |
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wylewka gr, 30mm |
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21,000 |
0,030 |
0,630 |
1,300 |
0,819 |
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płyty dachowe gr. 30 mm |
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25,000 |
0,030 |
0,750 |
1,100 |
0,825 |
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izolacja term. |
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6,000 |
0,150 |
0,900 |
1,100 |
0,990 |
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suprema gr. 150mm |
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strop gr 80 mm |
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25,000 |
0,080 |
2,000 |
1,100 |
2,200 |
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tynk gr. 15 mm |
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19,000 |
0,015 |
0,285 |
1,100 |
0,314 |
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śnieg |
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--------- |
---------- |
1,372 |
1,400 |
1,921 |
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6,377 |
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7,640 |
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qk = |
6,377 |
kN/m2. |
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q0 = |
7,640 |
kN/m2. |
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N dachuobl = |
a*b*go = |
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N 1 = |
263,590 |
kN |
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b.obciążenia stałe i zmienne od stropu. |
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Qmax = |
48,376 |
kN/mb |
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Po = |
30,153 |
kN/mb |
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L = |
6,000 |
m. |
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a = |
1,132 |
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b = |
1,218 |
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N2 = |
a*Qmax*L +b*Po*L |
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N2 = |
548,928 |
kN |
h |
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c.obciążenia własne. |
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N = |
a*b*h*gf |
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a = |
350,000 |
mm |
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b = |
350,000 |
mm |
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h = |
2740,000 |
mm |
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a |
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gf = |
25,000 |
kN/m2. |
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N3 = |
8,391 |
kN |
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3.1.2. Obciążenia całkowite. |
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N =N1+(n-1)N2+N3 |
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n = |
4 |
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Nsd = |
1918,765 |
kN |
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Lcd = |
2740,000 |
mm |
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Lo = |
0,8*Lcd = |
2192,000 |
mm |
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3.2. Ustalenie wymiarów przekroju poprzecznego słupa . |
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Lo / b < 10 |
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b>Lo /10 = |
219,2 |
mm |
a = |
350,000 |
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przyjmuję axb = 300x300 |
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b = |
350,000 |
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3300,000 |
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Lcd = |
2740,000 |
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0,000 |
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hstopy = |
100,000 |
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3.3.1. Określenie mimośrodu. |
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eo =ea+ee |
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ee = |
0,000 |
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Lcd /600= |
4,567 |
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ea = |
max
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h / 30 = |
11,667 |
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10,000 |
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eo = |
10,000 |
mm |
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*mały mimośród |
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xeff / d > xeff,lim |
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*duży mimośród |
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xeff / d =< xeff,lim |
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Nsd = a*fcd *xeff*d*b |
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xeff = Nsd / a*fcd *xeff*d*b > |
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xeff,lim |
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d = |
310,000 |
mm |
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xeff = |
1,963 |
> |
xeff,lim = |
0,530 |
dla stali A-III |
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xeff =a'+ pierwiastek(a'2 +Nsd*es2 / ( fcd*a*b )) |
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a' = |
40,000 |
mm |
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Nsd = |
1918,765 |
kN |
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es2 = |
0,5 * h - eo - a` = |
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125,000 |
mm |
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fcd = |
10,600 |
N/mm2 |
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a = |
0,850 |
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b = |
350,000 |
mm |
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xeff = |
318,670 |
mm < h= |
350,000 |
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przyjmuję |
xeff = |
350,000 |
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3.3.2. Określenie zbrojenia na ściskanie. |
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As1 = ( Nsd*es1-fcd*a*b*xeff* (d-0,5*xeff) ) / ( fyd*(d-a` ) ) |
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es1 = |
0,5h - a + eo |
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a = |
50,000 |
mm |
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es1 = |
135,000 |
mm |
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As1 = |
1179,126 |
mm2 |
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Przyjmuję 4 pręty o śr. 20 mm ; As1 = |
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1272,0 |
mm2 |
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3.3.3. Określenie rozstawu strzemion. |
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r = As1 /b*h |
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r = |
3,076% |
Przyjmuję rozstaw strzemion co 10 średnic |
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zbrojennia głównego . |
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s1 = |
10 *20 |
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s1 = |
200,000 |
mm |
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Strzemiona wykonane są ze stali A-I , srednica 6 mm . |
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3.4. Stopa . |
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N+G/F<=m*gfn |
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gfn = |
180,000 |
kN/m2. |
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m = |
0,810 |
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G = |
20,210 |
kN |
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N = |
1918,765 |
kN |
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F > N+G/m*gfn |
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F = |
13,299 |
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A = B = pierw F = |
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3,65 |
m. |
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A = B = |
3,600 |
m. |
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3.3.4. Określenie zbrojenia w stopie fundamentowej . |
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b |
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gro = N/(B*A) |
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B |
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gro = |
148,053 |
kN/m2. |
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M = gro*(L-asł)2*(2B+bsł)/24 |
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M. = |
446,337 |
kN/m2. |
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As = M/(d*0,9*fyd) |
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d = |
950,000 |
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As = |
1491,52 |
mm2 |
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As = |
14,915 |
cm2 |
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Przyjmuję 21 prętów o śr .10 mm o As = |
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16,49 |
cm2 |
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3.3.5. Sprawdzenie warunku na przebicie . |
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Nsd -gro* A <= NRD |
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NRD = fcd*Up*d |
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Up = Oabcd + Ostopy = |
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9,900 |
m. |
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Nsd -gro* A = |
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1135,566 |
< NRD = |
62964,0 |
kN |
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Warunek jest spełniony. |
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