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Residential Flexible/Rigid Diaphragm Analysis[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Residential Flexible/Rigid Diaphragm Analysis
- From: Seaintonln(--nospam--at)aol.com
- Date: Sun, 21 Mar 1999 13:19:20 EST
I happen to speak with a few engineers on different committees for both SEAOSC and SEAOC. There appears to be (and I agree) a growing disagreement with the prospects of designing custom (or conventional) residential structures (single family) using rigid diaphragm techniques. There is also a growing concern or disagreement with penalizing the structure when using embedded (Pendulum) steel columns for resisting lateral loads on a small portion of the structure. The disagreement here is not that the loads to the columns should not be amplified, but that the entire structure should not be forced to comply to a much lower Rw when only a portion of the building is strengthened using embedded columns. Personally, I would rather wait the results of the Cal-Tech/CUREE study before subjecting clients to higher design and construction costs which may be indicative of construction quality rather than design deficiencies. With July approaching quickly, I am concerned that local municipalities will not be aware of the number of engineers who question this approach and would hope that local building officials will take this into consideration. It is further my understanding from discussing this with a knowledgeable SEAOSC committee member than the wood committee questions the need for this change, but has been overruled by the seismology committee. I am not sure whether this was at SEAOSC level or at the final State level (SEAOC). Perhaps some of you can shed some light on this topic and we can make at least our opinions heard. Sincerely, Dennis S. Wish PE Editor SEAINT Online
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