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Rigid Diaphragm Analysis for Plywood Shear Walls[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Rigid Diaphragm Analysis for Plywood Shear Walls
- From: RShreenan(--nospam--at)AOL.COM
- Date: Sun, 26 Sep 1999 17:29:04 EDT
I have been watching the past threads revealing the frustrations of Dennis Wish, Bill Allen and others and I commiserate with them. I have turned down structural design jobs on two 2-story custom homes already because I am not sure that I know how to design them using the '97 U.B.C. I doubled my normal fees and was relieved when the client went elsewhere. I have been thinking about ways that one might utilize software that is already developed for now to save time in this analysis. Enercalc has a program for rigid diaphragms for concrete or masonry walls that I believe could be adapted for use with plywood shear panels. If there was a good user-friendly program for calculating plywood shear wall deflections, then the plywood shear panels (assumed first trial) could be loaded with the same load, say 2 to 5K and the deflections noted for each panel. The inverse of these deflections could be normalized and treated as relative rigidities and used in the Enercalc program for purposes of distributing the shear from the "rigid" plywood diaphragm. This part of it is fairly simple once the panels are located on the coordinate grid. It is the shear panel deflection calcs that are difficult and time consuming. This may have to be cycled more than once depending on the actual shears that the shear walls receive and their strength and stiffness based on the original shear panel assumed for plywood type and nailing. This two-step process could reduce the calc time, if there is a good program for calculating the plywood shear panel deflections available with all of the factors incorporated that contribute to the deflection. This is just a thought and I welcome your comments and any information on available software for plywood shear wall deflection calcs. Ray Shreenan, S.E.
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