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Re: Simplified Seismic Fa

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In a message dated 2/28/2008 9:02:34 AM Pacific Standard Time, terry(--nospam--at) writes:
Hi Scott Martin;
    Yes.  "Fa" comes from Table 11.4-1 or just conservatively use 1.0
for rocky sites or 1.4 for soil.  Rocky is defined as with bedrock less than
10 feet deep.  They also say it does not need to be larger than 1.5.
    Good luck!  Take care,

Terry Weatherby
Engineering and Design
Jackson, CA
Here are my 2cents worth:
Most Building Departments will NOT let you use a rocky site  and make you use Seismic Design Category "D" unless substantiated by a soils report, even if USGS  gives you a SDC of "B". I think the reason for this is that the surface to rock distance has to be verified.
Antonio S. Luisoni
Consulting SE
Granada Hills, CA

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