loads on multiple piles under a cap subjected to moment
loads on multiple piles under a cap subjected to moment
(OP)
looking for a text which deals with loads on multiple piles under a cap subjected to moment and vertical load
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loads on multiple piles under a cap subjected to moment
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RE: loads on multiple piles under a cap subjected to moment
What size pile cap, how many piles, where is the vertical load applied? Can you take lateral load into the piles or do they need to be skewed?
RE: loads on multiple piles under a cap subjected to moment
RE: loads on multiple piles under a cap subjected to moment
staad. we model plate elements and use spring support
for piles.
i dont really know which one is preferable
as plate element is a flexible approach..
while manual/spreadsheet calculation use rigid approach..
can anyone explain when is it proper to use rigid or flexible?
RE: loads on multiple piles under a cap subjected to moment
If your length is greater than about 10 times your depth then definately flexible, less than 5 then definately rigid body, in between up to judgement.
RE: loads on multiple piles under a cap subjected to moment
A technically curious friend relocated to Egypt for a few years on business. He noted that the rebar they were using in construction was smooth.
RE: loads on multiple piles under a cap subjected to moment
So I would be careful about trusting a finite element analysis alone. I would double check the results using the method recommended by csd72.
DaveAtkins
RE: loads on multiple piles under a cap subjected to moment
csd72, based to your criteria, should I still consider a 400 ft X 200 ft slab flexible even if it has a thickness of 12-15 ft?
Thanks.
RE: loads on multiple piles under a cap subjected to moment
That is a huge slab! What are you designing?
I would imagine you could save a lot of money if you analysed it as flexible in an FEM analysis program.
DaveAtkins,
Did you include an allowance for the flexibility of the pile supports or did you treat these as 100% rigid. The flexibility of the piles will even out the loads a little.
Even FEM is not perfect even if you include everything as it treats everything as elastic materials. The method I described above has been used for many years and has been found to be satisfactory for small pile caps that can be treated as rigid.
RE: loads on multiple piles under a cap subjected to moment
DaveAtkins