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Re: DC Spectral Ordinates[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: DC Spectral Ordinates
- From: "Michael Valley" <mtv(--nospam--at)skilling.com>
- Date: Wed, 24 Nov 1999 14:10:41 -0700
- Comments: Authenticated sender is <mtv(--nospam--at)linux.skilling.com>
- Priority: normal
Chapter 3 of TI-809-04 is pretty clear when it indicates that you should use the MCE maps. You will notice that the "conversion algorithms" used to convert UBC zone to spectral ordinates appears in the section "Design values for sites outside the U.S." and warns that "the conversion is approximate." The UBC zones lump a wide range of seismic hazard together. The conversion had to be based on the largest values in the range. Since your site is in the U.S., the MCE maps should be used. ------- Forwarded Message Follows ------- Date: Wed, 24 Nov 1999 10:06:53 -0500 From: "Nicole Stoudt" <NSTOUDT(--nospam--at)MBAKERCORP.COM> To: <seaint(--nospam--at)seaint.org> Subject: DC Spectral Ordinates Reply-to: seaint(--nospam--at)seaint.org Organization: http://www.seaint.org Please Help! I am working on a seismic analysis in Washington DC. The MCE maps from FEMA-302 give me values of Ss =.14 and S1 = .07 for the site. What confuses me is that TI-809-04 (which I must use) says that you can convert UBC Zones to S1 and Ss, and doing it the way they describe, I get Ss = .31 and S1= .14 for Zone 1. These two methods of getting the numbers are so different that I am not sure which to use, it seems to me the maps give the more realistic values, can somebody PLEASE help me? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Michael Valley E-mail: mtv(--nospam--at)skilling.com Skilling Ward Magnusson Barkshire Inc. Tel:(206)292-1200 1301 Fifth Ave, #3200, Seattle WA 98101-2699 Fax: -1201
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