Eccentric load

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Eccentric load in shallow foundation design.

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Eccentric load

  1. 1. ECCENTRIC LOAD<br />By : CrystinPanjaitan<br />Edwin Serano<br />EkiSinaga<br />Ricky Bancin<br />
  2. 2. <ul><li>Pengaruhmomenlenturpadadayadukungdapatdiperkirakandenganmengubahmomenlenturpadaeksentrisitasekivalen (e).
  3. 3. Kemudiandimensifondasitelapakdiperkeciluntukmemperhitungkanpengaruheksentrisitas yang merugikan, denganpenjelasansebagaiberikut :</li></li></ul><li>Pengaruhdimensifondasitelapakdapatdihitungdenganpersamaan:<br /><ul><li>L' = L - 2ex (modified width)
  4. 4. B' = B - 2ey (modified length)
  5. 5. ex = (eccentricities in the directions of length)
  6. 6. ey = (eccentricities in the directions of width) </li></li></ul><li>Dimana ;<br />B : lebarpondasi<br />B’ : lebarefektifpondasi<br />L : panjangpondasi<br />L’ : panjangefektifpondasi<br />e: eksentrisitasbebanresultanpadadasarpondasi<br />Mx = momenlentursejajardenganlebarfondasi, B (ton.matauKN/m)<br />My = momenlentursejajardenganpanjangfondasi, B (ton.matauKN/m)<br />P = beban (ton atau KN)<br />
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  9. 9. For design the minimum dimensions of a rectangular footing with a central column of dimensions “Wx x Wy”are required to be<br />Bmin = 4ey + Wy B’ = 2ey + Wy<br />Lmin = 4ex + Wx B’ = 2ex + Wx<br />
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  11. 11. 2) Bebanbatas yang bekerjapadafondasitelapakmenimbulkankeruntuhandukungsebagaiberikut:<br />Pu = qultB’L’<br />
  12. 12. The ultimate bearing capacity for footings with eccentricity, using either the Meyerhof or Hansen/Vesic equations, is found in either of two ways:<br />
  13. 13. 1) Use either the Hansen or Vesic bearing-capacity equation<br />
  14. 14. a. Use B' in the yBNy term.<br />b. Use B' and L' in computing the shape factors.<br />c. Use actual B and L for all depth factors.<br />The computed ultimate bearing capacity qult is then reduced to an allowable value qa with an appropriate safety factor SF as<br /> (and Pa = qaB'L')<br />qa = qult/ SF <br />
  15. 15. 2) Use the Meyerhof general bearing-capacity equation and a reduction factor Re<br />
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  27. 27. THANK YOU… ^^<br />

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