Eccentric load

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    25-Jun-2015
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Eccentric load in shallow foundation design.

Transcript of Eccentric load

  • 1. ECCENTRIC LOAD
    By : CrystinPanjaitan
    Edwin Serano
    EkiSinaga
    Ricky Bancin

2.

  • Pengaruhmomenlenturpadadayadukungdapatdiperkirakandenganmengubahmomenlenturpadaeksentrisitasekivalen (e). 3. Kemudiandimensifondasitelapakdiperkeciluntukmemperhitungkanpengaruheksentrisitas yang merugikan, denganpenjelasansebagaiberikut :

Pengaruhdimensifondasitelapakdapatdihitungdenganpersamaan:

  • L' = L - 2ex(modified width) 4. B' = B - 2ey(modified length) 5. ex =(eccentricities in the directions of length) 6. ey = (eccentricities in the directions of width)

Dimana ;
B : lebarpondasi
B: lebarefektifpondasi
L : panjangpondasi
L: panjangefektifpondasi
e: eksentrisitasbebanresultanpadadasarpondasi
Mx = momenlentursejajardenganlebarfondasi, B (ton.matauKN/m)
My = momenlentursejajardenganpanjangfondasi, B (ton.matauKN/m)
P= beban (ton atau KN)
7. 8. 9. For design the minimum dimensions of a rectangularfootingwith a central column of dimensions Wx x Wyare required to be
Bmin = 4ey + WyB = 2ey + Wy
Lmin = 4ex + WxB = 2ex + Wx
10. 11. 2) Bebanbatas yang bekerjapadafondasitelapakmenimbulkankeruntuhandukungsebagaiberikut:
Pu = qultBL
12. The ultimate bearing capacity for footings with eccentricity, using either the Meyerhof or Hansen/Vesic equations, is found in either of two ways:
13. 1) Use either the Hansen or Vesic bearing-capacity equation
14. a. Use B' in the yBNy term.
b. Use B' and L' in computing the shape factors.
c. Use actual B and L for all depth factors.
The computed ultimate bearing capacity qult is then reduced to an allowable value qa with an appropriate safety factor SF as
(and Pa = qaB'L')
qa = qult/ SF
15. 2) Use the Meyerhof general bearing-capacity equation and a reduction factor Re
16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. THANK YOU ^^