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Re: Fixed Column Base

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Fixed bases on piles are not uncommon.  Assuming that the moments are
sufficient to cause some of the piles to go into uplift,
Pile Rxn = (P/A) +- M*C/I
you need to make sure the pile itself can develop the necessary uplift
resistance and that the pile to cap connection is adequate to transfer the
tensile force.  Also, you can detail the pile head to cap connection to
develop full or partial fixity of the pile to cap connection - you will need
more pile embedment into the cap and you may also need special details like
extending some of the pile strands further into the cap.

M. David Finley, P.E.

----- Original Message -----
From: "Jim Kestner" <jkestner(--nospam--at)somervilleinc.com>
To: "'SEAINT'" <seaint(--nospam--at)seaint.org>
Sent: Tuesday, February 05, 2002 9:58 AM
Subject: Fixed Column Base


> There is a crane building 90 feet high by 90 feet wide. To control sway,
it
> is felt that we have to fix the column bases. The base moments are
> substantial.....about 1000 ft-kips. The columns are supported on a pile
> foundation driven to rock at about 30 feet below grade.
>
> Is it possible to create fixity with a pile foundation? I would think we
> could design the pile cap to resist the moment and make an attachment of
> the piles to resist the up and down forces. I would think the issue comes
> down to whether the pile can resist the upward force.
>
> Is this how others see it? Does anyone else have experience with this type
> of structure? Any guidance is certainly appreciated.
>
> Jim K.
>
>
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