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[SEAOC] Re: [SEAOC] Plywood Shearwall Deflection[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Re: [SEAOC] Plywood Shearwall Deflection
- From: seaoc-ad(--nospam--at)seaoc.org (Shafat Qazi)
- Date: Wed, 3 Jul 96 13:03 PDT
Dennis, >From what I read, it would be more appropriate to call your system a wood frame. The two shearwalls acting as columns, and the connection above the door header acting as a beam. Now, the question is, will this frame work? I don't think so. Primarily because you can not accomplish a moment connection in wood members. A pin frame will not work. I recommend that you look at the whole wall. Consider moving the door such that you get at least one shear panel that meets the h/d requirements. Hope that helps. Shafat >A friend that lives in Los Angels recently contacted me to see if I could >help him with this problem. I would like some input on the following >hypothetical problem: > >The L.A. City building department increased the H/b ratio of 2:1 for >plywood shear panels - where, prior to the Northridge earthquake the ratio >was 3.5:1. The height of the panel was twelve feet from foundation to >lateral restraint at the roof diaphragm. The design has a three foot >shear panel on either side of a four foot by seven foot door. The panels >don't make the 2:1 ratio required by the ordinance. >I responded by explaining that I thought you could exceed the 2:1 ratio if >you design the panel for deflection based upon the 1991 UBC standard. He >indicated that he did not feel comfortable with this based upon the >current ordinance. He further explained that as far as he knew, there was >no new testing on wall deflection. > >Classically, the tow panels can be combined across the opening as long as >each pier is adequately anchored and braced. The question came as to how >to determine the deflection of the two piers when tied across the opening >and acting together. > >Does anyone have a method for determining shear wall deflection with an >opening in the shear panel? > >Dennis Wish PE > >... > > ...
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