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RE: FIXED HEAD PILE CONDITION IN A PILE CAP[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: FIXED HEAD PILE CONDITION IN A PILE CAP
- From: "Sprague, Harold O." <spragueho(--nospam--at)bv.com>
- Date: Fri, 1 Aug 2003 12:57:13 -0500
Both conditions should be met for a fixed head condition. The embedment is somewhat SWAG developed, but the relative stiffness is important. There is no well developed engineering research in the 10 factor. It probably could be 5. But a factor of 10 keeps you out of trouble. The only way you could achieve a fixed head condition for a single pile is to provide stiff tie grade beams that would act as a pile cap. Again the tie beam should be significantly stiffer than the pile.
I am looking for good reference/conditions/web site for achieving 'fixed head' condition for piles(group) in
a pile cap( and pile cap design). This would help in getting more lateral resistance than 'pinned head'
condition (assuming the passive resistance of soil is very small).
The USACE publication( EI 02C097) recommends two criterias.
1. The embedment length of piles in the pile cap is 2*(pile dia)
2. The stiffness of piles should be equal to 10*(stiffness of of the individual piles)
( I remember, in one of the engineering magazines last year, there was a discussion about
this & the authors recommended a ratio of about 5 ? )
The question is, do I have consider both criterias to achieve 'fixed' head condition?
Is there anything else I need to consider?
I think it is not possible to achieve 'fixed' head condition with only one pile
in a small pile cap. Any comments?
Any input is greatly appreciated.
Ravi Vasu P.E.
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