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Re: fem & caissons

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It is probably not a good idea to try to base a lateral pile analysis 
solely on RISA3D.  The lateral stiffness of the soil can be 
significantly nonlinear, is sensitive to the properties of 
various soil layers,  and even within layers varies substantially as 
a function of the depth.  As a minimum, I would suggest using a 
program like LPILEplus (or information from the appropriate NAVFAC 
Design Manual) to understand the behavior of an individual pile.  

If the work needs to extend to pile groups, then pile group
behavior can be calculated by methods described in texts (using group 
factors, etc.) or it may be possible to make an appropriate linear, 
3D FE model if the nonlinearity of individual springs is not 
significant for the range of loads anticipated.  The individual 
springs would be assigned properties to match the results of the more 
involved single pile analysis (which is really the critical step).


> Date:          Thu, 13 May 1999 10:20:00 -0700
> From:          "Mark D. Baker" <shake4bake(--nospam--at)>
> Organization:
> To:            seaoc <seaint(--nospam--at)>
> Subject:       fem & caissons
> Reply-to:      seaint(--nospam--at)

> 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?
> Regards,
> Mark

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Michael Valley                                   E-mail: mtv(--nospam--at)
Skilling Ward Magnusson Barkshire Inc.                  Tel:(206)292-1200
1301 Fifth Ave, #3200,  Seattle  WA 98101-2699          Fax:        -1201