Temat: Stopa fundamentowa obciążona mimośrodowo w jednej płaszczyźnie |
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Autorzy: Świder Jacek, Żuczek Jacek |
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Opis: Program służy do sprawdzenia stanu granicznego nośności podłoża na podstawie danych: |
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obciążenia obliczeniowego,wymiarów stopy,głębokości posadowienia,parametrów geologicznych |
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Rozdzielczość: 860:640 |
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Oznaczenia: komórki koloru |
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służą do wprowadzania danych |
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wyniki obliczeń |
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1.Wartości sił obliczeniowych przekazywanych na fundament |
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Pr-obliczeniowa wartość pionowej składowej obciążenia |
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Pr= |
2820 |
[kN] |
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TrB-obliczeniowa siła pozioma działająca równolegle do |
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TrB= |
140 |
[kN] |
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krótszego boku podstawy B podstawy fundamentu |
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Mr-obliczeniowy moment działający na fundament |
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Mr= |
1450 |
[kN*m] |
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2.Przyjęcie wstępnych wymiarów stopy |
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B-szerokość prostokątnej podstawy fundamentu [m] |
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B= |
2.6 |
[m] |
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(wymiar krótszego boku) |
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L-długośc prostokątnej podstawy fundamentu [m] |
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L= |
3.2 |
[m] |
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(wymiar dłuższego boku) |
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h-wysokość całkowita stopy |
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h= |
0.85 |
[m] |
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w-wysokość prostokątnęj podstawy fundamentu |
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w= |
0.35 |
[m] |
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Dmin-głębokość posadowienia od poziomu posadzki |
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Dmin= |
1 |
[m] |
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a1-górna szerokość stopy |
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a1= |
0.8 |
[m] |
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a2-górna długośc stopy |
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a2= |
0.7 |
[m] |
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D-całkowita głębokość posadowienia |
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D= |
1.4 |
[m] |
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3.Zestawienie obciążeń obliczeniowych przekazywanych na grunt |
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Ciężar stopy żelbetowej |
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Gr1=gb(n)*Vb*gf |
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Vb=B*L*w+(h-w)/6*[(2L+a1)*B+(2L+a1)*a2] |
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gb(n)-ciężar objętościowy betonu |
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gb(n)= |
24 |
[kN/m3] |
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gf-współczynnik obciążenia dla betonu |
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gf= |
1.1 |
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Vb-objętośc stopy fundamentowej |
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Vb= |
4.892 |
[m3] |
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Gr1= |
129.1488 |
[kN] |
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Ciężar gruntu nad fundamentem |
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g(n)-ciężar objętościowy gruntu nasypowego |
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g(n)= |
17 |
[kN/m3] |
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gf-współczynnik materiałowy dla gruntu |
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gm= |
1.2 |
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Gr2=g(n)*(B*L*h-Vb)*gf |
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Gr2= |
44.472 |
[kN] |
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Ciężar posadzki |
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gb(n)-ciężar objętościowy posadzki |
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gb(n)= |
24 |
[kN/m3] |
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d-grubość posadzki |
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d= |
0.15 |
[m] |
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as1,as2-wymiary słupa |
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as1= |
0.6 |
[m] |
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as2= |
0.5 |
[m] |
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gf-współczynnik obciążenia dla posadzki |
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gf= |
1.3 |
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Gr3=gb(n)*(B*L-as1*as2)*d*gf' |
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Gr3= |
37.5336 |
[kN] |
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Ciężar całkowity |
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Gr=Gr1+Gr2+Gr3 |
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Gr= |
211.1544 |
[kN] |
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4.Sprawdzenie czy wypadkowa obciążeń stałych i zmiennych długotrwałych |
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znajduje się w rdzeniu podstawy |
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Qr=Pr+Gr |
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Qr= |
3031.1544 |
[kN] |
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MR=Mr+h*Tr |
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MR= |
1569 |
[kN*m] |
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eL=MR/Nr |
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eL= |
0.517624572341152 |
[m] |
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l/6= |
0.533333333333333 |
[m] |
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L/6>eL |
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wypadkowa obciążeń znajduje się w rdzeniu |
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5.Sprawdzenie stanu granicznego nośności podłoża |
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warstwa 1 |
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g1(n)= |
17 |
[kN/m3] |
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warstwa 2 |
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g2(n)= |
9.5 |
[kN/m3] |
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współczynnik materiałowy |
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gm= |
0.9 |
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cu(r)-obliczeniowa wartość spójności gruntu zalegające- |
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cu(r)= |
0 |
[kPa] |
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go bezpośrednio poniżej poziomu posadowienia |
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Fn(r) -obliczeniowa wartość kąta tarcia wewnętrznego |
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Fu(r) = |
26.5 |
[o] |
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gruntu zalegającego bezpośrednio poniżej poziomu posadowienia |
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Współczynniki nośności podłoża |
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wyznaczamy na podstawie Fu(r) i tablicy Z1-1 PN-81/B-03020: |
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ND = |
12.795 |
NB = |
4.453 |
Nc= |
22.75 |
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Średni obliczeniowy ciężar gruntu poniżej podstawy stopy (średnia ważona do z=B) |
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gBśr(r)=Sgi(r)*hi/Shi |
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grubość warstwy |
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h1 = |
0.5 |
[m] |
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h2 = |
2.1 |
[m] |
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gBśr(r)= |
9.84807692307692 |
[kN/m3] |
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Zredukowana długość fundamentu |
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L' =L-2*eL |
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L' = |
2.1647508553177 |
[m] |
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Współczynniki wpływu nachylenia wypadkowej |
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tgdL = |
0.046187023663328 |
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tgFn(r) = |
0.498288881872464 |
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tgdL /tgFn= |
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0.092691258712751 |
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Na podstawie tgdL/tgFn(n) z nomogramów Z1-2 PN-81/B-03020 wyznaczymy: |
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iD = |
0.93 |
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iD - |
współczynnik wpływu nachylenia wypadkowej |
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iB = |
0.92 |
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iB - |
współczynnik wpływu nachylenia wypadkowej |
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ic= |
0.95 |
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ic- |
współczynnik wpływu nachylenia wypadkowej |
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Średni obliczeniowy ciężar gruntu ( i ew. posadzki) powyżej poziomu posadowienia |
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gD(r)=(Sgi(r)*hi'+gb(r)*d)/Dmin |
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h1'= |
0.35 |
[m] |
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h2'= |
0.5 |
[m] |
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gD(r)= |
22.02 |
[kN/m3] |
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OPÓR GRANICZNY PODŁOŻA |
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QfNL=B*L' *[(1+0,3B/L')*Nc*cu(r)*ic+(1+1,5*B/L')*gD(r)*g*Dmin*ND*iD+(1- 0,25*B/L')*gBśr(r)*g*B*NB*iB] |
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QfNL= |
3705.82993217925 |
[kN] |
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m-współczynnik korekcyjny |
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m= |
0.81 |
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QfNL*m= |
3001.72224506519 |
[kN] |
< |
Qr= |
3031.1544 |
[kN] |
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nośność podłoża jest za mała !!!! |
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Jeżeli nośność podłoża jest za mała .Dla zredukowania niekorzystnego wpływu mimośrodowego obciążenia fundamentu, |
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zarówno na rozkład obciążeń jednostkowych pod podstawą fundamentu, jak i na opór graniczny podłoża należy przesunąć |
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środek ciężkości podstawy stopy w kierunku punktu, gdzie wypadkowa obciążeń zewnętrznych działających na fundament |
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(Pr,Mr,Hr) przecina płaszczyznę poziomu posadowienia. |
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Przyjęto przesunięcie |
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es = |
0.4 |
m |
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Moment obciążeń względem środka podstawy fundamentu |
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MR=Mr+h*TrB-es*Pr |
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MR= |
441 |
[kN*m] |
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Mimośród wypadkowej względem środka ciężkości |
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eL= |
0.145489124539482 |
[m] |
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wymiary podstawy |
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B = |
2.6 |
[m] |
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L' =L-2*eL |
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L' = |
2.90902175092104 |
[m] |
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warunek stanu granicznego nośności |
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QfNL= |
5328.06369482021 |
[kN] |
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QfNL*m= |
4315.73159280437 |
[kN] |
> |
Qr= |
3031.1544 |
[kN] |
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warunek nośności spełniony |
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