Eccentric load on pile cap
Eccentric load on pile cap
(OP)
Hi all,
I received an as-built drawing of the piling work for my project. The pile in question is a 2 pile pile cap. To begin with, a 2 pile pile cap was designed to save cost & the piles are driven 6 inches off the center. this means there will be a moment induced due to this load eccentricity. How do I go about this problem?
the contractor gave me the as built only when the piling rig has left, so driving another pile to adjust the center of gravity of the pile cap is not an option.
the design load on each pile is 45 ton. the moment induced will therefore be 45tsf. I was thinking of using a tie beam between the pilecap in question & an adjacent pilecap
to counter the moment induced. the beam will act as a column to resist the compression from the induced moment M<=Fxl where F is the compression force & l is the distance between the c of g of the beam to the c of g of the pilecap. Is this approach on the right track?
the stump is 1 feet & the pile diameter is 8 inch diameter.
Any other way to overcome this problem?
thanx in advance
I received an as-built drawing of the piling work for my project. The pile in question is a 2 pile pile cap. To begin with, a 2 pile pile cap was designed to save cost & the piles are driven 6 inches off the center. this means there will be a moment induced due to this load eccentricity. How do I go about this problem?
the contractor gave me the as built only when the piling rig has left, so driving another pile to adjust the center of gravity of the pile cap is not an option.
the design load on each pile is 45 ton. the moment induced will therefore be 45tsf. I was thinking of using a tie beam between the pilecap in question & an adjacent pilecap
to counter the moment induced. the beam will act as a column to resist the compression from the induced moment M<=Fxl where F is the compression force & l is the distance between the c of g of the beam to the c of g of the pilecap. Is this approach on the right track?
the stump is 1 feet & the pile diameter is 8 inch diameter.
Any other way to overcome this problem?
thanx in advance






RE: Eccentric load on pile cap
As for your fix, it grates me the wrong way to have to rely on anything designed afterward when it should have been built right the first time! However, the fix you propose doesn't seem out of the ordinary assuming you can develop the load to counter the moment.
BTW, how can you have a moment of 45tsf? That is a stress not a moment.
RE: Eccentric load on pile cap
thanx for the early reply
yes, it's design & build. I just got bumped out from another D & B project because I was not CORPERATIVE by telling the contractor not to cut corners; I expect this one possess the same attitude, work ethics & wisdom as the previous one.Changing the contractor is beyond my limited training skill. Here's an interesting quote from my contractor"Do you have any idea how much beer we can have if we don't do this or vice versa?"
Sorry, my my mistake. Point load multiply eccenctricity equals moment. point load is 90 ton with 6" eccentricity from pile cap C of G. That would be 45ft-tons. Stand corrected
RE: Eccentric load on pile cap
I would design the beam for its calculated moment and check each pile for the axial force combined with the moment it will carry.
AEF
RE: Eccentric load on pile cap
RE: Eccentric load on pile cap