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Re: Shear wall w/ plywood on both sides
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- Subject: Re: Shear wall w/ plywood on both sides
- From: Mlcse(--nospam--at)aol.com
- Date: Sat, 23 Jan 1999 22:17:50 EST
In a message dated 1/23/99 3:37:14 AM EST, suresh(--nospam--at)ynn.com writes: << I would appreciate your comments on the following -- When one of the several shear walls in a given line is provided with plywood on both sides, I have seen that some people consider the double sided shear wall equivalent to 2 times the actual length of the wall while calculating unit shear along that line.[i.e. v=V/(sum of length of single sided wall + 2*sum of double sided wall]. I feel little bit uneasy in buying this method of calculating unit shears in wood shear walls. Anybody has experience with this kind of situation? Thanks. Suresh Berkeley, Calif >> If I understand the problem correctly (as an example: a 4 foot wall w/ plywood one side, a 8 foot wall w/ plywood both sides, and a 6 foot wall w/ plywood one side all along the same wall line), this single line of shear walls will resist a total load, but not necessarily in the proportions most likely assummed (example: assuming average plywood shear is 300#/ft, therefore average distribution would be 4 foot wall: 300#.ft, 8 foot wall: 2x 300# /ft, 6 foot wall: 300#/ft.) . The plywood wall with plywood both sides in your case will most likely be stiffer than the walls with plywood on one side only depending upon actual wall lengths, gravity loads, holdown sizes, nail size and spacing on each wall, etc. You can calculate the plywood shear wall deflection for these walls to see how much load they actually take. All walls must have the same deflection since they are in the same line and tied together by the diaphragm. If you do the calculation, then you can have some walls with plywood both sides, and other walls with plywood one side along the same wall line. From what I understand, more building departments in the very near future are going to be requiring wood shear wall deflection calculations be included in the submitted calc's for plan check. I think the more common design practice would be to sheath either one side or both sides for all the shear walls along a given single wall line, using the same nail spacing for all plywood sheathing along this wall line. Mike Cochran
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