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Re: fem & caissons

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I believe that both of you may be somewhat off-track insofar as the
modeling for this type of analysis.  Laterally loaded piles and caissons
behave in a nonlinear response, mostly governed by the soil effective
modulus which is dependent on displacement.  This affects the resulting net
deflection, point of inflection, and moments in the pile/caisson.  You
should probably consult with a geotechnical engineer on this problem;
specialized software has already been developed for this application, but
it requires both geotechnical expertise input and structural definition of
the cracking and plastic moment capacities of the pile/caisson.  This is a
very much a procedure in pushover analysis, not elastic analysis.

Gary Chock

At 11:21 AM 5/13/99 -0700, you wrote:
>I haven't used Risa 3d, but piles can be modeled using horiz springs spaced
>at say 1ft vertically with the spring stiff based on the the soil mod the
>geotech gives you (or should give you).
>Lanny J. Flynn, P.E., S.E.
>-----Original Message-----
>From: Mark D. Baker <shake4bake(--nospam--at)>
>To: seaoc <seaint(--nospam--at)>
>Date: Thursday, May 13, 1999 11:10 AM
>Subject: fem & caissons
>>Has anyone had success trying to model an embedded pile subject to
>>lateral loads with Risa3d ? I know vertical load can be assessed for a
>>spread footing modelling plate/shell elements but I'd like to try it
>>with a round drilled, cast-in-place pile. Any body had success or
>>failure with this they would like to share?


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