TEMAT: OBLICZENIE ŁAWY FUNDAMENTOWEJ POD |
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ŚCIANĄ WEWNĘTRZNĄ BUDYNKU. |
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AUTORZY: IWONA ŁĘCKA, DAWID KLIMECKI |
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Program służy do odliczania ławy fundamentowej pod ścianą wewnętrzną budynku. |
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Na podstawie danych: - szerokość ściany nad ławą; - grubość posadzki; |
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- obciążenie osiowe przekazywane na ławę ma 1mb |
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- charakterystyka warstw podłoża gruntowego pod ławą |
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Uzyskujemy wyniki: |
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- szerokość ławy fundamentowej |
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- nośność graniczną podłoża |
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Dane dla użytkownika: |
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Rozdzielczość: 1024 x 768 |
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- komórki zaznaczone kolorem fioletowym zawierają dane |
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- komórki zaznaczone kolorem niebieskin zawierają wyniki |
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- komórki zaznaczone kolorem zielonym zawierają komentarz |
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Dane: |
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bs = |
0.38 |
m |
szerokość ściany |
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dp = |
0.10 |
m |
grubość posadzki |
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1.60 |
m |
górny poziom ławy |
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Nrs = |
210 |
kN/m |
siła pionowa przekazywana na ławę ma 1 mb |
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TrB = |
1.95 |
kN |
siła pozioma działająca równolegle do krótszego boku(B), podstawy fundamentu |
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hs = |
1.00 |
m |
odległość dolnego poziomu ławy do stropu drugiej warstwy |
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Ciężar objętościowy żelbetu |
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gż = |
25 |
kN/m3 |
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Obliczenia wykonano na 1 metr długości ławt. L = |
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1.00 |
m |
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Przyjęto wysokość ławy hł=0,4m. |
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hł = |
0.40 |
m |
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D min = dp + h = |
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0.50 |
m |
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Warstwy podłoża: |
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- do 3m p.p.t. Wilgotny piasek drobnoziarnisty |
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ID(n) = |
0.5 |
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- do 6m p.p.t. Pył grupy geologicznej C |
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IL(n) = |
0.3 |
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- pod pyłem występuje glina piaszczysta grupy geologicznej B |
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IL(n) = |
0.1 |
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Stopień zagęszczeni i plastyczności dla poszczególnych rodzajów gruntu odczytano z normy |
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PN - 81/B - 03020 - "Posadowienie bezpośrednie budowli. Obliczenia statyczne i projektowanie." |
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Określenie parametrów geotechnicznych podłoża metodą B. |
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gm = |
ada:
dla metody B
1.1 |
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ada:
dla metody B
0.9 |
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Warstwa 1: Wilgotny piasek drobnoziarnisty (Pd): |
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grubość warstwy |
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hw1= |
Klimecki:
od poziomu 0,00m
3.00 |
m |
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stopień zagęszczenia |
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ID(n) = |
0.50 |
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ciężar objętościowy |
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g = r * g |
g = |
10 |
m/s2 |
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r = |
ada:
PN-81/B-03020 tab.2
1.75 |
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g = r * g = |
1,75*10 = |
17.5 |
kN/m3 |
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kąt tarcia wewnętrznego |
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Fu(n) = |
ada:
PN-81/B-03020 rys.3
0.53 |
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Fu(r) = |
0.48 |
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spójność |
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Cu(n) = |
0.00 |
kN/m2 |
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Cu(r) = |
0.00 |
kN/m2 |
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współczynniki nośności |
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NC = |
ada:
PN-81/B-03020 tab. Z1-1
24.8 |
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ND = |
ada:
PN-81/B-03020 tab.Z1-1
13.9 |
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NB = |
ada:
PN-81/B-03020 tab.Z1-1
5.1 |
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iC,iD,iB - współczynniki wpływu wypadkowej obciążenia, wyznaczone z nomogramów na rys. Z1-2. |
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iC = |
Klimecki:
iC,iD,iB - współczynniki wpływu wypadkowej obciążenia, wyznaczone z nomogramów na rys. Z1-2.
1.00 |
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iD = |
0.99 |
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iB = |
0.97 |
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dB - kąt nachylenia wypadkowej obciążenia |
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tgdB = |
0.009 |
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kąt tarcia wewnętrznego |
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Fu(n) = |
ada:
PN-81/B-03020 rys.3
0.532 |
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Fu(r) = |
0.479 |
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0.02 |
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Warstwa 2: Pył grupy C: |
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grubość warstwy |
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hw2= |
3.00 |
m |
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stopień plastyczności |
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IL(n) = |
0.30 |
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ciężar objętościowy |
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g = r * g |
g = |
10 |
m/s2 |
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r = |
2.00 |
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g = r * g = |
20.00 |
kN/m3 |
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kąt tarcia wewnętrznego |
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Fu(n) = |
13.00 |
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Fu(r) = |
11.70 |
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spójność |
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Cu(n) = |
12.50 |
kN/m2 |
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Cu(r) = |
11.25 |
kN/m2 |
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współczynniki nośności |
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NC = |
Klimecki:
PN-81/B-03020 tab. Z1-1
8.80 |
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ND = |
Klimecki:
PN-81/B-03020 tab. Z1-1
2.80 |
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NB = |
Klimecki:
PN-81/B-03020 tab. Z1-1
0.30 |
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Warstwa 3: Glina piaszczysta grupy B: |
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stopień plastyczności |
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IL(n) = |
0.10 |
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ciężar objętościowy |
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g = r * g |
g = |
10 |
m/s2 |
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r = |
2.20 |
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g = r * g = |
22.00 |
kN/m3 |
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kąt tarcia wewnętrznego |
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Fu(n) = |
20.20 |
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m |
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Fu(r) = |
18.18 |
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spójność |
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Cu(n) = |
35.50 |
kN/m2 |
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Cu(r) = |
31.95 |
kN/m2 |
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współczynniki nośności |
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NC = |
Klimecki:
PN-81/B-03020 tab. Z1-1
13.25 |
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ND = |
Klimecki:
PN-81/B-03020 tab. Z1-1
5.35 |
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NB = |
Klimecki:
PN-81/B-03020 tab. Z1-1
1.08 |
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Wstępne przyjęcie szerokości ławy (B): |
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B >= |
1.05 |
m |
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Przyjęto B = |
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1.60 |
m |
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Określenie obciążeń w poziomie posadowienia: |
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Obliczeniowa wartość obciążenia w poziomie posadowienia ławy. |
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Grł - ciężar własny ławy |
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Grp - ciężar posadzki spoczywający na odsadzkach |
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Grł = gf*B*h*L*gż |
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gf = |
1.1 |
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Grł = |
17.60 |
kN |
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Grp =gf*(B-bs)*L*dp*gp |
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gp - ciężar objętościowy posadzki |
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gp = |
21 |
kN/m3 |
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Grp = |
2.82 |
kN |
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Qr = Nrs*L+Grł+Grp |
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Qr = |
230.4182 |
kN |
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Nośnośc graniczna podłoża: |
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Qf = |
738.1332 |
kN |
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Sprawdzenie pierwszego stanu granicznego. |
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m = 0,9*0,9 = |
|
ada:
współczynnik korekcyjny wg.PN-81/B-03020 (wg.punktu 3.3.4.)
0.81 |
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Qr <= m*Qf |
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230.4182 |
<= |
597.887892 |
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sprawdź czy warunek jest spełniony ? |
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Ponieważ podłoże jest warstwowe i h < 2B sprawdzamy kolejną warstwę: |
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Wymiary zastępczego fundamenyu wynoszą: |
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B' = B+b |
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L' = L |
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Dla gruntów niespoistych przy h <= B, b = h/3 ; h jest odległością od poziomu posadowienia do |
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stropu warstwy niższej. |
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b =hs/3 = |
0.33 |
m |
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B' = |
1.93 |
m |
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L' = |
1.00 |
m |
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D'min = |
1.40 |
m |
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Obliczeniowa wartoścobciążenia w poziomie stropu warstwy niższej: |
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Qr' = Qr+B'*L'*h*gh(r) |
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gh(r) - obliczeniowa wartość ciężaru objętościowego warstwy piasku |
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gh(r) = |
15.75 |
kN/m3 |
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Qr' = |
242.5982 |
kN |
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Opór graniczny warstwy niższej: |
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Qf' = B'*L'*[NC*Cu(r)+ND*gD(r)*Dmin'+NB*gB(r)*B'] |
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Qf' = |
496.402666666667 |
kN |
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Q'r <= m*Q'f |
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242.5982 |
<= |
402.08616 |
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warunek spełniony ? |
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