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Re: Residential Flexible/Rigid Diaphragm Analysis[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Residential Flexible/Rigid Diaphragm Analysis
- From: SDGSE(--nospam--at)aol.com
- Date: Fri, 26 Mar 1999 01:40:32 EST
If the new flexible/rigid diaphragm or all other code changes triggered by the Northridge Earthquake were meant to improve the performance of buildings and limit the amount of damage to less than "safety-level" damage, then how does one explain the fact that many structures on the same block with similar design and construction, and sometimes older structures, suffered no or much less damage than others. Two houses with similar design and construction, and in many cases with identical floor plans, built on the same block or adjacent lots, suffered dissimilar damage, one damaged beyond repair, the other had minor damage. I do not think that both were doomed because they were designed as flexible diaphragms, and somehow God intervened and saved the one that housed a believer. The truth is that there were factors other than the code required design level that caused the damage in one house but not the other. How about pour design, construction, inspection, or soil condition? It's been customary to revise the code requirements after a disaster to correct the "deficiencies" that were not "fully understood" "then." How about now? Do we fully understand what caused the damage in one house and not the other? Although, both were designed by the same designer based on the then same code, and built by the same builder on two adjacent lots? If "political" demand for higher code design level continues after each damaging earthquake with no rational justification, then the future looks like this: V base= MW Where M (multiples of W) => 1 and W=Total weight of building, including code writers' weights, if more than 250 LBS, and the weight of any influencing politician, if they represent an insurance company that is not willing to pay up if a disaster occurs. Oshin Tosounian, S.E.
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