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[SEAOC] Re: [SEAOC] Seismic Design of Foundations

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On Sat, 31 Aug 1996, James A. Lord wrote:

> When designing a foundation of a seismic lateral resisting system, is it necessary to 
> design the foundation using all the concrete seismic design provisions?
> Two instances for discussion:
> 1. Moment resisting frame, & you are counting on some fixity at the base.  Do your grade 
> beams have to have the same details as a flexural member of a concrete SMRF?
> 2. Shear wall system.  For overturning, you need to extend the foundation beyond the end 
> of the shear wall a several feet.  For the extension, must you use the same details as a 
> concrete SMRF?
> Let's hear what the current practice is.

I have done:

 1. Yes

 2. No - but you've got me thinking about it now.

Bruce Swanney, P.E.
Winzler & Kelly, Guam