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Re: seaint Digest for 31 Jul 1999[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: seaint Digest for 31 Jul 1999
- From: Seaintonln(--nospam--at)aol.com
- Date: Fri, 6 Aug 1999 23:27:56 EDT
Although the statics of torsion allow for two moments of opposite signs to reduce the capacity in the wall, the code still requires the results to be compared against the results of the flexible diaphragm analysis which is goverened by wind or seismic. If the shear due to torsion calculates at less than the shear by tributary distribution, the worst condition will govern. The strange thing, in my opinion, is that the purpose is to balance the walls so as not to induce torsion. However, if you attempt to use the worst case shear, aren't you creating inequalities in the stiffness of the walls which work against rigidities due to torsion? Dennis In a message dated 8/6/99 1:35:12 PM Pacific Daylight Time, colin(--nospam--at)crosbygroup.com writes: << Mark & Dennis, I just came across the following message and have an additional question/ comment to add. I have also always been under the impression that the effect of torsional shears (even regardless of the many ways they appear to be calculated) could not reduce the overall shear force for a particular wall. Mark, this is something you stated at the end of you attached example. In reviewing Volume 1 page 78 of the Seismic Design Manual recently published by SEAOC, it is stated that torsional shears can be subtracted if they are due to the reduced eccentricity (e-e accidental). Does anyone have any insight to this issue as it does appear to go against the intent of section 1603.3.3 of the 1994 UBC and what I also presume to be the implied intent of section 1605.2.1? >>
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