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[SEAOC] Seismic Design of Foundations

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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.

James Lord, S.E.
jlord(--nospam--at)pacbell.com

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