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RE: Foundation design for seismic

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What is the R factor for a system where energy is dissipated through uplift
of the foundation?

I believe that this is a fairly common situation which occurs when you have
the minimum dead load required and at the same time when you have some
extra elastic capacity  in the lateral system.

Is it appropriate to use the R factor for an eccentrically braced frame
when the frame never yields because there isn't enough dead load to resist
uplift?

Is anybody familiar with the studies done on foundation uplift?

Mark Gilligan