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Re: Int'l Bldg. Code 2000 Seismic Maps

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At 12:25 PM 3/6/98 -0500, you wrote:
>Recently, Roger Turk provided the USGS web site address where seismic maps
in 
>IBC 2000 could be found. Question: Which maps specifically are to be
selected 
>? Are they the 0.2 sec and 1.0 sec Spectral Accel. with 10% Probability of 
>Exceedence in 50 years ? There are similar maps for other percent
probability 
>of exceedence. 
>
>Jim Fulton
The IBC is based on the 1997 NEHRP provisions, which has established
criteria based on 2% in 50 years.  However, a 2/3 factor is applied to the
2%/50 spectral acceleration subsequently for design purposes.  You should
obtain a copy of the 1997 NEHRP to review in detail  the design procedure,
as there are many other differences.

Gary Chock
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