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RE: Seismic requirements in NYC[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Seismic requirements in NYC
- From: "Paul Feather" <PFeather(--nospam--at)se-solutions.net>
- Date: Tue, 19 Sep 2006 11:27:12 -0700
If they are using the 1990 UBC as stated (should be 1991), then the R of 8 is correct, however it is only correct if the appropriate formulas are used from the 1991 code. R values were reduced when the seismic base shear formulas were rewritten for the 1997 UBC. You cannot compare R values from different codes unless you also compare the formulas and results that are derived from their use.
Seismic detailing requirements in the 1991 UBC were based on zone. Also, even if wind governs design, the structure still has to meet the necessary seismic detailing requirements.
Narayan C.K. [mailto:anant_27(--nospam--at)yahoo.com]
For a braced frame with shear walls, R of 8 seems to be high. For a SCBF and a special concrete shear wall, a R of 6 is specified both by IBC and ASCE.
Maybe I am missing something, but R of 8 seems high for the system specified.
ANANTHA NARAYAN, E.I.
Bliss and Nyitray Inc.
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