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Fwd: fema 178 Aa values

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        our firm is involved in some retrofit work in the Portland, OR area.
We are comparing upgrades requirements between UBC zone III and FEMA
178/1992.
FEMA base shear values are signifigantly lower than UBC. (approx 75% lower!!)

realizing FEMA 178 is for life safety only, and UBC has serviceability etc.,
built-in to
its values to some extent, i am still amazed at how 'lite' the FEMA forces
are.

I read the FEMA 178/1992 seismic maps for Portland as  Aa=0.05 & Av=0.05

Do the geophysicist for 'fema' have that drastic of a different opinion
about the Portland area
seismicity than ICBO? - Or are is FEMA 178/1992 that much 'lighter'?

I would be interested to hear opinions/comments/experiences.

thanks.

Tim Terich



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Richard Lewis, P.E.
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