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Spis treści |
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str. |
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1.0. |
Opis techniczny |
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2.0. |
Obliczenia statyczne. |
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2.1. |
Dane do obliczeń. |
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2.2. |
Ustalenie obciążeń działających na stopę fundamentową. |
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2.3.1. |
Ustalenie ciężaru fundamentu. |
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2.3.2. |
Analiza schematów obciążeń. |
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2.4. |
Ustalenie wysokości stopy żelbetowej, sprawdzenie jej na przebicie. |
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2.5. |
Obliczenie stanu granicznego nośności w strefie warstwy słabej |
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2.6. |
Sprawdzenie II stanu granicznego użytkowania (osiadanie). |
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2.7. |
Obliczenie zbrojenia stopy fundamentowej. |
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Rysunki |
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Przekrój geotechniczny skala 1:20 |
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Rysunek konstrukcyjny stopy fundamentowej skala 1:20 |
26 |
1.0. |
Opis techniczny |
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1.1. |
Projekt obejmuje stopę pod słup hali przemysłowej. Danymi wyjściowymi do projektu |
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były: |
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- wymiary słupa: |
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ax= |
0,40 |
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ay= |
0,30 |
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- rodzaje i wartości obciążeń charakterystycznych działających na konstukcję. |
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- rodzaje gruntów dla których podano wartości stopnia zagęszczenia, stopnia |
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plastyczności oraz miąższość. |
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1.2. |
Stopę fundamentową wykonano jako trapezową o wymiarach: |
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- długość |
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L= |
1,60 |
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- szerokość |
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B= |
1,20 |
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- wysokość |
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h= |
0,60 |
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- długość odsadzki |
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0,05 |
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Stopa jest posadowiona na głebokości |
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Dmin= |
1,20 |
m poniżej poziomu terenu. |
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Poziom wody gruntowej znajduje się poniżej poziomu posadowienia stopy fundamentowej. |
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Stopę fundamentową zaprojektowano jako żelbetową zbrojoną prętami: |
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- podłużnie |
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f |
10 |
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- w poprzek |
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f |
8 |
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1.3. |
Na stopę przewidziano beton klasy B15 o wytrzymałości gwarantowanej RbG= 15 MPa, |
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wytrzymałości charakterystycznej na ściskanie Rbk= 11,3 MPa, wytrzymałości |
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obliczeniowej na rozciąganie Rbz= 0,75 MPa. Na beton podkładowy przewidziano |
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beton klasy B7,5 o wytrzymałości gwarantowanej RbG= 7,5 MPa, wytrzymałości |
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charakterystycznej na ściskanie Rbk= 5,7 MPa, wytrzymałości obliczeniowej |
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na rozciąganie Rbz= 0,42 MPa. |
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Na zbrojenie przyjęto stal klasy |
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A-III |
o wytrzymałości obliczeniowej Ra= |
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350 |
MPa |
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Srednica prętów: |
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- stopa |
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f |
10 |
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- słup |
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f |
16 |
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1.4. |
Wykaz norm: |
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- PN-90/B-03000 |
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Projekty budowlane. Obliczenia statyczne. |
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- PN-81/B-03020 |
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Grunty budowlane. Posadowienie bezpośrednie budowli. |
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Obliczenia statyczne i projektowanie. |
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- PN-82/B-02000 |
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Obciążenia bydowli. Zasady ustalania wartości. |
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- PN-82/B-02001 |
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Obciążenia bydowli. Obciążenia stałe. |
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- PN-82/B-02003 |
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Obciążenia bydowli. Obciążenia zmienne technologiczne. |
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Podstawowe obciążenia montażowe. |
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- PN-82/B-02004 |
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Obciążenia bydowli. Obciążenia zmienne technologiczne. |
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Obciążenia pojazdami. |
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- PN-76/B-03001 |
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Konstrukcje i podłoża budowlane. Ogólne zasady obliczeń. |
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- PN-84/B-03264 |
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Konstrukcje betonowe, żelbetowe i sprężone. |
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Obliczenia statyczne i projektowanie. |
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2.3. |
Ustalenie ciężaru fundamentu. Analiza poszczególnych schematów. |
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2.3.1. |
Ustalenie ciężaru fundamentu. |
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Przyjęcie wymiarów stopy fundamentowej: |
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Dmin= |
1,20 |
[m] |
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Wymiary słupa |
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ax=asL= |
0,40 |
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ay=asB= |
0,30 |
[m] |
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Wymiary stopy |
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L/B= od 1,0 do 1,7 |
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przyjęto |
L= |
1,60 |
[m] |
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B= |
1,20 |
[m] |
L/B= |
1,3 |
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aL=asL+0,05= |
0,50 |
[m] |
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aB=asB+0,05= |
0,40 |
[m] |
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Wysokość stopy |
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0,3(L-asL) < h < 0,5(L-asL) |
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0,36 |
< h < |
0,6 |
przyjęto |
h= |
0,60 |
[m] |
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dmin=15 cm i min h/3 = |
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przyjęto |
d= |
0,20 |
[m] |
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Obliczenie ciężaru obliczeniowego fundamentu i gruntu nad nim. |
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Schemat fundamentu do obliczenia ciężaru. |
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0,60 |
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0,50 |
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0,40 |
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1,20 |
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0,60
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0,20
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L= |
1,60 |
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B= |
1,20 |
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Objętość fundamentu: |
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Po podstawieniu otrzymujemy: |
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Vf= |
0,75 |
[m3] |
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Objętość gruntu nad fundamentem: |
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Po podstawieniu otrzymujemy: |
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Vgr= |
1,55 |
[m3] |
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Obciążenie na grunt: |
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Gdzie: |
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Vf= |
0,75 |
[m3] |
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Vgr= |
1,55 |
[m3] |
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gżel= |
24,0 |
[KN/m3] |
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ggr= |
17,2 |
[KN/m3] |
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gf1= |
1,1 |
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gf2= |
1,2 |
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Po podstawieniu otrzymujemy: |
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Grf= |
51,8 |
[KN] |
ciężar stopy z gruntem |
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Schemat II |
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Nr2= |
448,6 |
[KN] |
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Dmin= |
1,20 |
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h= |
0,60 |
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Tr2= |
40,4 |
[KN] |
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L= |
1,60 |
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f= |
0,11 |
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Mr2= |
65,5 |
[KNm] |
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B= |
1,20 |
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Grf= |
51,8 |
[KN] |
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Obliczenie mimośrodu względem środka ciężkości stopy: |
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65,5 |
448,6 |
0,11 |
40,4 |
0,60 |
39,2 |
[KNm] |
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448,6 |
51,8 |
500,4 |
[KN] |
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39,2 |
500,4 |
0,08 |
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eLdop=L/30= |
0,05 |
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a pierwszy rdzeń L/6= |
0,27 |
[m] |
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Trs<10%Nr1 |
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40,4 |
< |
50,0 |
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Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
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500,4 |
1,20 |
1,60 |
260,6 |
[KPa] |
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329,3 |
[KPa] |
192,0 |
[KPa] |
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1,20 |
0,00 |
1,20 |
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1,60 |
0,16 |
1,44 |
[m] |
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Parametry geotechniczne gruntu: |
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rD=rB= |
1,58 |
[t/m3] |
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g= |
9,81 |
[m/s2] |
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fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
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cu= |
0,00 |
[KPa] |
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TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
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m= |
0,81 |
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Podstawiając do wzoru: |
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Otrzymujemy: |
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QfNB= |
1049 |
[KN] |
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Warunek nośności: |
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Parametry geotechniczne gruntu: |
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TrL= |
40,4 |
[KN] |
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Nro= |
500,4 |
[KN] |
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tgdB=TrL/Nro= |
0,08 |
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tgf= |
0,51 |
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tgdB/tgf= |
0,16 |
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to |
iC= |
0,85 |
iD= |
0,86 |
iB= |
0,75 |
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Podstawiając do wzoru: |
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Otrzymujemy: |
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QfNL= |
907 |
[KN] |
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Warunek nośności: |
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Schemat III |
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Nr3= |
382,8 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr3= |
31,1 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
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f= |
0,11 |
[m] |
|
|
Mr3= |
47,6 |
[KNm] |
|
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B= |
1,20 |
[m] |
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Grf= |
51,8 |
[KN] |
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Obliczenie mimośrodu względem środka ciężkości stopy: |
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47,6 |
382,8 |
0,11 |
31,1 |
0,60 |
23,1 |
[KNm] |
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382,8 |
51,8 |
434,6 |
[KN] |
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23,1 |
434,6 |
0,05 |
[m] |
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eLdop=L/30= |
0,05 |
[m] |
|
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a pierwszy rdzeń L/6= |
0,27 |
[m] |
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Trs<10%Nr1 |
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31,05 |
< |
43,5 |
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Rzeczywisty mimośród nie przekracza dopuszczalnego, mimo to nośność obliczam ze wzorów: |
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434,6 |
1,20 |
1,60 |
226,4 |
[KPa] |
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266,2 |
[KPa] |
186,6 |
[KPa] |
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1,20 |
0,00 |
1,20 |
[m] |
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1,60 |
0,11 |
1,49 |
[m] |
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Parametry geotechniczne gruntu: |
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|
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rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
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|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
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Podstawiając do wzoru: |
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Otrzymujemy: |
|
|
QfNB= |
1069 |
[KN] |
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Warunek nośności: |
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Parametry geotechniczne gruntu: |
|
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|
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|
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|
|
TrL= |
31,05 |
[KN] |
|
Nro= |
434,6 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,07 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,14 |
|
to |
iC= |
0,86 |
iD= |
0,86 |
iB= |
0,77 |
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|
Podstawiając do wzoru: |
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|
|
Otrzymujemy: |
|
|
QfNL= |
931 |
[KN] |
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|
Warunek nośności: |
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Schemat IV |
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Nr4= |
448,6 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr4= |
51,5 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
|
f= |
0,11 |
[m] |
|
|
Mr4= |
79,7 |
[KNm] |
|
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B= |
1,20 |
[m] |
|
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|
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Grf= |
51,8 |
[KN] |
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|
|
Obliczenie mimośrodu względem środka ciężkości stopy: |
|
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|
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|
79,7 |
448,6 |
0,11 |
51,5 |
0,60 |
60,0 |
[KNm] |
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448,6 |
51,8 |
500,4 |
[KN] |
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60,0 |
500,4 |
0,12 |
[m] |
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|
|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
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|
Trs<10%Nr1 |
|
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|
51,515 |
> |
50,0 |
|
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|
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|
|
Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
|
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|
500,4 |
1,20 |
1,60 |
260,6 |
[KPa] |
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|
365,7 |
[KPa] |
155,5 |
[KPa] |
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1,20 |
0,00 |
1,20 |
[m] |
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|
1,60 |
0,24 |
1,36 |
[m] |
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|
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|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
|
|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
|
|
|
|
|
|
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|
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|
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|
|
Podstawiając do wzoru: |
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNB= |
1017 |
[KN] |
|
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|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
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|
|
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|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TrL= |
51,515 |
[KN] |
|
Nro= |
500,4 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,10 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,20 |
|
to |
iC= |
0,80 |
iD= |
0,83 |
iB= |
0,70 |
|
|
|
|
|
|
|
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|
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|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNL= |
840 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
|
|
|
|
|
|
|
|
|
|
|
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|
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Schemat V |
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|
|
Nr5= |
435,4 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr5= |
57,9 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
|
f= |
0,11 |
[m] |
|
|
Mr5= |
97,8 |
[KNm] |
|
|
B= |
1,20 |
[m] |
|
|
|
|
|
|
|
Grf= |
51,8 |
[KN] |
|
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|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Obliczenie mimośrodu względem środka ciężkości stopy: |
|
|
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|
|
|
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|
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|
|
97,8 |
435,4 |
0,11 |
57,9 |
0,60 |
83,5 |
[KNm] |
|
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|
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|
|
435,4 |
51,8 |
487,3 |
[KN] |
|
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|
|
83,5 |
487,3 |
0,17 |
[m] |
|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
Trs<10%Nr1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
57,94 |
> |
48,7 |
|
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|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
|
|
|
|
|
|
|
|
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|
|
487,3 |
1,20 |
1,60 |
253,8 |
[KPa] |
|
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|
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|
|
|
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|
|
|
|
|
|
399,5 |
[KPa] |
108,1 |
[KPa] |
|
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|
|
1,20 |
0,00 |
1,20 |
[m] |
|
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|
|
|
|
|
|
|
|
1,60 |
0,34 |
1,26 |
[m] |
|
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|
|
|
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|
|
|
|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
|
|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNB= |
977 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TrL= |
57,94 |
[KN] |
|
Nro= |
487,3 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,12 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,24 |
|
to |
iC= |
0,77 |
iD= |
0,79 |
iB= |
0,65 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Podstawiając do wzoru: |
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNL= |
761 |
[KN] |
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
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|
|
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|
|
|
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|
|
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Schemat VI |
|
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|
|
|
|
|
|
Nr6= |
435,4 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr6= |
48,1 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
|
f= |
0,11 |
[m] |
|
|
Mr6= |
85,2 |
[KNm] |
|
|
B= |
1,20 |
[m] |
|
|
|
|
|
|
|
Grf= |
51,8 |
[KN] |
|
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|
Obliczenie mimośrodu względem środka ciężkości stopy: |
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|
85,2 |
435,4 |
0,11 |
48,1 |
0,60 |
65,0 |
[KNm] |
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435,4 |
51,8 |
487,3 |
[KN] |
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65,0 |
487,3 |
0,13 |
[m] |
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|
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|
|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
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|
Trs<10%Nr1 |
|
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|
|
|
|
48,06 |
< |
48,7 |
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Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
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|
487,3 |
1,20 |
1,60 |
253,8 |
[KPa] |
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|
367,2 |
[KPa] |
140,4 |
[KPa] |
|
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1,20 |
0,00 |
1,20 |
[m] |
|
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|
1,60 |
0,27 |
1,33 |
[m] |
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|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
|
|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNB= |
1007 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
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|
|
|
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|
|
|
|
|
|
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|
|
|
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|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TrL= |
48,06 |
[KN] |
|
Nro= |
487,3 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,10 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,20 |
|
to |
iC= |
0,80 |
iD= |
0,83 |
iB= |
0,70 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNL= |
830 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Schemat VII |
|
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|
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|
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|
|
Nr7= |
382,8 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr7= |
40,6 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
|
f= |
0,11 |
[m] |
|
|
Mr7= |
70,9 |
[KNm] |
|
|
B= |
1,20 |
[m] |
|
|
|
|
|
|
|
Grf= |
51,8 |
[KN] |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Obliczenie mimośrodu względem środka ciężkości stopy: |
|
|
|
|
|
|
|
|
|
|
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|
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|
|
70,9 |
382,8 |
0,11 |
40,6 |
0,60 |
52,1 |
[KNm] |
|
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|
|
382,8 |
51,8 |
434,6 |
[KN] |
|
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|
52,1 |
434,6 |
0,12 |
[m] |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Trs<10%Nr1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
40,58 |
< |
43,5 |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
434,6 |
1,20 |
1,60 |
226,4 |
[KPa] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
316,0 |
[KPa] |
136,7 |
[KPa] |
|
|
|
|
|
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|
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|
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|
|
1,20 |
0,00 |
1,20 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
1,60 |
0,24 |
1,36 |
[m] |
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
|
|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNB= |
1017 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TrL= |
40,58 |
[KN] |
|
Nro= |
434,6 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,09 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,18 |
|
to |
iC= |
0,81 |
iD= |
0,84 |
iB= |
0,72 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Podstawiając do wzoru: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Otrzymujemy: |
|
|
QfNL= |
852 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Warunek nośności: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
Schemat VIII |
|
|
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|
|
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|
|
|
|
|
|
|
|
Nr8= |
448,6 |
[KN] |
|
|
Dmin= |
1,20 |
[m] |
|
|
h= |
0,60 |
[m] |
|
|
Tr8= |
30,1 |
[KN] |
|
|
L= |
1,60 |
[m] |
|
|
f= |
0,11 |
[m] |
|
|
Mr8= |
53,3 |
[KNm] |
|
|
B= |
1,20 |
[m] |
|
|
|
|
|
|
|
Grf= |
51,8 |
[KN] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Obliczenie mimośrodu względem środka ciężkości stopy: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
53,3 |
448,6 |
0,11 |
30,1 |
0,60 |
20,9 |
[KNm] |
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
448,6 |
51,8 |
500,4 |
[KN] |
|
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|
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|
|
|
|
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|
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|
|
20,9 |
500,4 |
0,04 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Trs<10%Nr1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
30,104 |
< |
50,0 |
|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rzeczywisty mimośród nie przekracza dopuszczalnego, mimo to nośność obliczam ze wzorów: |
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
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|
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|
|
|
|
|
|
|
|
|
|
500,4 |
1,20 |
1,60 |
260,6 |
[KPa] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
297,2 |
[KPa] |
224,1 |
[KPa] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,20 |
0,00 |
1,20 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
1,60 |
0,08 |
1,52 |
[m] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Parametry geotechniczne gruntu: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
|
|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
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Podstawiając do wzoru: |
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|
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|
|
|
Otrzymujemy: |
|
|
QfNB= |
1078 |
[KN] |
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Warunek nośności: |
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Parametry geotechniczne gruntu: |
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TrL= |
30,104 |
[KN] |
|
Nro= |
500,4 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,06 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,12 |
|
to |
iC= |
0,87 |
iD= |
0,89 |
iB= |
0,82 |
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Podstawiając do wzoru: |
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Otrzymujemy: |
|
|
QfNL= |
977 |
[KN] |
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Warunek nośności: |
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Schemat IX |
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Nr9= |
435,4 |
[KN] |
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Dmin= |
1,20 |
[m] |
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h= |
0,60 |
[m] |
|
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Tr9= |
14,9 |
[KN] |
|
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L= |
1,60 |
[m] |
|
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f= |
0,11 |
[m] |
|
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Mr9= |
32,2 |
[KNm] |
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B= |
1,20 |
[m] |
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Grf= |
51,8 |
[KN] |
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Obliczenie mimośrodu względem środka ciężkości stopy: |
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32,2 |
435,4 |
0,11 |
14,9 |
0,60 |
-7,9 |
[KNm] |
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435,4 |
51,8 |
487,3 |
[KN] |
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-7,9 |
487,3 |
-0,02 |
[m] |
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eLdop=L/30= |
0,05 |
[m] |
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a pierwszy rdzeń L/6= |
0,27 |
[m] |
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Trs<10%Nr1 |
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14,908 |
< |
48,7 |
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Rzeczywisty mimośród nie przekracza dopuszczalnego, mimo to nośność obliczam ze wzorów: |
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487,3 |
1,20 |
1,60 |
253,8 |
[KPa] |
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267,5 |
[KPa] |
240,0 |
[KPa] |
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1,20 |
0,00 |
1,20 |
[m] |
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1,60 |
-0,03 |
1,63 |
[m] |
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Parametry geotechniczne gruntu: |
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|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
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fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
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Podstawiając do wzoru: |
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|
Otrzymujemy: |
|
|
QfNB= |
1123 |
[KN] |
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Warunek nośności: |
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Parametry geotechniczne gruntu: |
|
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|
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|
|
TrL= |
14,908 |
[KN] |
|
Nro= |
487,3 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,03 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,06 |
|
to |
iC= |
0,98 |
iD= |
0,98 |
iB= |
0,95 |
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Podstawiając do wzoru: |
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Otrzymujemy: |
|
|
QfNL= |
1142 |
[KN] |
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|
Warunek nośności: |
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Schemat X |
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Nr10= |
382,8 |
[KN] |
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Dmin= |
1,20 |
[m] |
|
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h= |
0,60 |
[m] |
|
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Tr10= |
30,7 |
[KN] |
|
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L= |
1,60 |
[m] |
|
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f= |
0,11 |
[m] |
|
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Mr10= |
58,3 |
[KNm] |
|
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B= |
1,20 |
[m] |
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Grf= |
51,8 |
[KN] |
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Obliczenie mimośrodu względem środka ciężkości stopy: |
|
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58,3 |
382,8 |
0,11 |
30,7 |
0,60 |
33,6 |
[KNm] |
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382,8 |
51,8 |
434,6 |
[KN] |
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33,6 |
434,6 |
0,08 |
[m] |
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|
eLdop=L/30= |
0,05 |
[m] |
|
|
|
a pierwszy rdzeń L/6= |
0,27 |
[m] |
|
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Trs<10%Nr1 |
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|
30,7 |
< |
43,5 |
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Rzeczywisty mimośród przekracza dopuszczalny, więc nośność obliczamy ze wzorów: |
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434,6 |
1,20 |
1,60 |
226,4 |
[KPa] |
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284,2 |
[KPa] |
168,6 |
[KPa] |
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1,20 |
0,00 |
1,20 |
[m] |
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1,60 |
0,15 |
1,45 |
[m] |
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|
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Parametry geotechniczne gruntu: |
|
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|
|
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|
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|
|
|
|
rD=rB= |
1,58 |
[t/m3] |
|
g= |
9,81 |
[m/s2] |
|
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|
|
|
|
|
|
fu= |
26,8 |
[o] |
to |
NC= |
23,6 |
ND= |
12,9 |
NB= |
4,5 |
|
cu= |
0,00 |
[KPa] |
|
TrB= |
0 |
[KN] |
to |
iC= |
1 |
iD= |
1 |
iB= |
1 |
|
m= |
0,81 |
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Podstawiając do wzoru: |
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|
|
Otrzymujemy: |
|
|
QfNB= |
1050 |
[KN] |
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|
Warunek nośności: |
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Parametry geotechniczne gruntu: |
|
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|
|
TrL= |
30,7 |
[KN] |
|
Nro= |
434,6 |
[KN] |
|
|
tgdB=TrL/Nro= |
0,07 |
|
tgf= |
0,51 |
|
tgdB/tgf= |
0,14 |
|
to |
iC= |
0,86 |
iD= |
0,86 |
iB= |
0,77 |
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Podstawiając do wzoru: |
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|
Otrzymujemy: |
|
|
QfNL= |
911 |
[KN] |
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Warunek nośności: |
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Wnioski |
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Zestawienie naprężeń: |
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|
Nr |
qr |
qrmax |
qrmin |
eL |
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[KPa] |
[KPa] |
[KPa] |
[m] |
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1 |
226,359420833333 |
- |
- |
0,00 |
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2 |
260,6 |
329,3 |
192,0 |
0,08 |
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3 |
226,4 |
266,2 |
186,6 |
0,05 |
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4 |
260,6 |
365,7 |
155,5 |
0,12 |
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5 |
253,8 |
399,5 |
108,1 |
0,17 |
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6 |
253,8 |
367,2 |
140,4 |
0,13 |
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7 |
226,4 |
316,0 |
136,7 |
0,12 |
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8 |
260,6 |
297,2 |
224,1 |
0,04 |
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9 |
253,8 |
267,5 |
240,0 |
-0,02 |
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10 |
226,4 |
284,2 |
168,6 |
0,08 |
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Najbardziej niekorzystnym schematem obciążeń jest schemat nr |
5 |
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|
2.4. |
Ustalenie wysokości stopy żelbetowej, sprawdzenie jej na przebicie. |
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Beton klasy B15 |
|
Rbz= |
750 |
[KPa] |
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a) |
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0,3(L-asL) < h < 0,5(L-asL) |
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0,36 |
< h < |
0,6 |
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Przyjęto h = |
0,6 |
[m] |
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b) |
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0,28 |
[m] |
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Gdzie: |
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L= |
1,6 |
[m] |
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B= |
1,2 |
[m] |
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asL= |
0,4 |
[m] |
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asB= |
0,3 |
[m] |
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2,96 |
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253,8 |
[KPa] |
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Nrmax= |
487,3 |
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5 |
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Przyjęto h = |
0,6 |
[m] |
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c) |
warunek minimalnej długości zakotwienia prętów słupa |
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0,51 |
[m] |
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Gdzie: |
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da= |
0,8 |
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la0=40*d= |
0,64 |
[m] |
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d= |
16 |
[mm] |
średnica prętów zbrojenia |
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Faobl/Farzecz= |
1 |
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0,56 |
[m] |
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Przyjęto h = |
0,6 |
[m] |
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d) |
Sprawdzenie stopy na przebicie: |
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0,05 |
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0,05 |
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0,66 |
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0,40 |
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0,44 |
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0,40 |
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0,55 |
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h= |
0,60 |
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d= |
0,20 |
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0,91 |
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0,69 |
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L= |
1,60 |
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d1 |
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0,40 |
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0,40 |
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1,20 |
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bśr |
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0,40 |
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0,30 |
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0,50 |
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0,40 |
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0,80 |
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L/2= |
0,80 |
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0,11 |
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d1=0,69+0,05-0,55= |
0,16 |
[m] |
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ho=0,60-0,05= |
0,55 |
[m] |
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F=B*d1=1,20*0,19= |
0,20 |
[m2] |
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bśr=(B+asB)/2=(1,20+0,30)/2= |
0,75 |
[m] |
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ho=d-0,05+d1*tga=0,20-0,05+0,19*0,40/0,69= |
0,25 |
[m] |
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qrmax= |
399,5 |
[KPa] |
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Rbz= |
750 |
[KPa] |
dla betonu klasy B15 |
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Po podstawieniu do wzoru otrzymujemy: |
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78,0
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Wstępnie przyjęto wysokość przyjmujemy za ostateczną. |
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2.6. |
Sprawdzenie II stanu granicznego użytkowania (osiadanie). |
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Gnf= |
45,1 |
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Sdop=5 cm dla hali przemysłowej |
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Do obliczeń przyjmujemy kombinację podstawową: |
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Nn |
Tn |
Mn |
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[KN] |
[KN] |
[KNm] |
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Gki |
393,1 |
17 |
29 |
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Qki |
47 |
15,5 |
24 |
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Suma |
440,1 |
32,5 |
53 |
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L= |
1,6 |
[m] |
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B= |
1,2 |
[m] |
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Dmin= |
1,2 |
[m] |
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Charakterystyczne obciążenie pod stopą: |
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q=SN/(L*B)= |
229 |
[KPa] |
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Parametry geotechniczne do obliczeń: |
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g= |
9,81 |
[m/s2] |
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Rodzaj gruntu |
Miąższość |
ID |
IL |
r |
g(n) |
Mo |
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[m] |
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[t/m3] |
[KN/m3] |
[KPa] |
|
[KPa] |
Ppi |
w |
3,4 |
0,38 |
0 |
1,75 |
17,17 |
52000 |
0,8 |
65000 |
Jp |
D |
7 |
0 |
0,35 |
1,95 |
19,13 |
17500 |
0,8 |
21875 |
Gπ |
B |
12 |
0 |
0,08 |
2,1 |
20,60 |
50000 |
0,75 |
66667 |
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hi=B/2= |
0,6 |
maksymalna grubość warstwy guntu do obliczeń |
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L/B= |
1,3 |
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l= |
1 |
przy czasie wznoszenia budowli ponad rok |
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Wyliczenie osiadania budowli dokonano na podstawie wzorów: |
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Po wyliczeniach zestawionych w tabeli na następnej stronie otrzymano wartość osiadania: |
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0,62
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[cm] |
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Warunek II stanu granicznego (osiadań) jest spełniony. |
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2.7. |
Obliczenie zbrojenia stopy fundamentowej. |
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q |
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0,40 |
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0,11 |
0,55 |
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L/2= |
0,80 |
L/2= |
0,80 |
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L= |
1,60 |
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C |
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et |
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0,40 |
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0,30 |
1,20 |
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0,11 |
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0,4 |
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0,3 |
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1,6 |
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1,2 |
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Obliczenia wykonujemy dla najbardziej niekorzystnego schematu, schemat nr |
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5 |
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eL= |
0,17 |
[m] |
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gmax= |
399,5 |
[KPa] |
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gmin= |
108,1 |
[KPa] |
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Na zbrojenie przyjęto stal klasy |
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A-III |
o Ra= |
350 |
[MPa] |
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Obliczenie zbrojenia równoległego do długości stopy: |
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334,6 |
[KPa] |
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0,71 |
[m] |
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0,53 |
[m2] |
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Pr=qr*Ft= |
178,8 |
[KN] |
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0,43 |
[m] |
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Mr=Pr*et= |
76,5 |
[KNm] |
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4,41 |
[cm2] |
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Obliczenie zbrojenia równoległego do szerokości stopy: |
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253,8 |
[KPa] |
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0,45 |
[m] |
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0,20 |
[m2] |
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Pr=qr*Ft'= |
51,4 |
[KN] |
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0,27 |
[m] |
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Mr=Pr*et'= |
13,9 |
[KNm] |
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0,80 |
[cm2] |
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Przyjęcie ilości zbrojenia ze względu na minimalny rozstaw prętów: |
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Równolegle do długości stopy |
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B= |
1,20 |
[m] |
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n= |
6 |
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B/n= |
0,20 |
[m] |
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Przyjęto rozstaw prętów co |
20
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liczba prętów |
6
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o średnicy f= |
10 |
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Równolegle do szerokości stopy |
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L= |
1,60 |
[m] |
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n= |
2 |
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L/n= |
0,80 |
[m] |
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Przyjęto rozstaw prętów co |
20
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liczba prętów |
8
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o średnicy f= |
8 |
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