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Alaska Building[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Alaska Building
- From: "Michael Krakower" <mkrakower(--nospam--at)earthlink.net>
- Date: Mon, 16 Oct 2000 18:55:43 -0700
Monty Hart, In my opinion, a relative rigidity analysis should be done in both directions. A tributary area check should be done in the transverse direction to compare the demands. Compartment analysis of three sided sub-units is not rational. The horizontal diaphragms have considerable displacement control capacity parallel to the longitudinal open fronts. I have used UBC Standards section 23-2 to estimate horizontal diaphragm deflection of an open front by taking a value of twice the cantilever projection for the equivalent simple span. Any use of gypsum board or plaster for resistance to distributed demands should be avoided. These materials degrade rapidly during ground shaking and many similar configured apartments in the Los Angeles area have had unacceptable damage in past earthquakes. I would not combine the stiffness of a steel moment frame with a long sheathed hallway wall in a rigidity analysis. The present system you have inherited should be able to be substantiated. Michael Krakower SE Arcadia, CA.
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