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Seimsic Force on Piles


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#1 Adeeel

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Posted 23 February 2012 - 12:55 AM

If you need to determine the lateral force on the piles of a pile cap, do you consider Pile Cap selfweight to determine the seismic force on the piles? If Yes, is there any guide about that in any code?
I got many different answers but no body has strong support for his opinion.

#2 McEngr

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Posted 23 February 2012 - 01:12 AM

I would use the pilecap self-weight but not he weight of the piles beneath. I do not have a reference other than the SEAOC SDM Volume 1.

#3 Adeeel

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Posted 24 February 2012 - 03:01 AM

Well McEngr, this what I think too but nothing to support it.

#4 dakota_79

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Posted 24 February 2012 - 03:51 AM

Codes can't be prescriptive about everything (though God knows they try!). Some things you just need to use your judgement; err on the side of being conservative. Assuming piles are the only thing providing lateral resistance, it would both err on the side of being conservative and make a good deal of sense to throw in contribution from the cap self-weight. Can't imagine that being a significant factor in any design, regardless.

#5 McEngr

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Posted 24 February 2012 - 02:37 PM

Sorry I couldn't be of better help adeel. I would think the lateral forces could get huge and hopefully the friction of a slab could help prevent these forces from occurring. Definitely a gray area in my opinion with lots of assumptions involved.




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