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[SEAOC] Re: Gyp. board shear walls in LA[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: Gyp. board shear walls in LA
- From: pepper(--nospam--at)netrunner.net (John Pepper)
- Date: Tue, 18 Jun 1996 16:45:49 -0400 (EDT)
As a young engineer, who didn't know any better, I one time attempted to use gypsum board in my calcualtions for the wind resisting system of a 6 stroy condominum. I very carfully subtracted about 15 psi for the boards contribution to the overall lateral resistance of the structure. My then boss, and later partner told me someting have never forgotten: "Never confuse stiffness with strenth." He explained the the gypsum walls would fail long before the reinforced masonry infilled walls shear walls and the somewhat (but not very) moment resistant flat plate/column system and therefore would not be avliable at the ultimate level for strength. He further explainted that the frame would not be worth much either since it was quite limber, (not stiff) in relation to the walls, and that it would pick up up very little in relation to the walls at ultimate. He said it was better to let the frame handle the P-delta effects of the vertical load and forget about it. After many years of designing structures, many with finite element teciniques and shear wall frame interaction, I still find him right. Mabey it the gyp board was the main system, it should be considered, but if there are many plywood or other walls, I take a careful look at where each items would fail, based on the load that its stiffness would give it in the loading cycle. John Pepper The Pepper Engineering Group, Inc. 20895 East Dixie Highway Aventura, FL 33180 pepper(--nospam--at)netrunner.net ...
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