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Re: horiz. diaph. -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: horiz. diaph. -Reply
- From: Tim McCormick <TMCCORMI(--nospam--at)BAS.CI.LA.CA.US>
- Date: Wed, 01 Jul 1998 11:01:14 -0700
John Rose, you wrote that " the diaphragm and shear wall values for 4-5 ply (and 3-ply) plywood are equivalent, regardless of the application. City of LA currently has a restriction on shear wall values for 3-ply plywood, limited to 200 lb/ft. APA's opinion is that this restriction is overly conservative and not supported by cyclic (reversed) load testing or monotonic testing." The greatest test and laboratory for shear walls in California is one of our frequent earthquakes. Unlike plywood panels constructed with four and five plys, forces caused by the Northridge Earthquake tore three-ply panels at their inner ply seam. This information supports reductions for 3ply panel construction and is more valuable than mere simulated testing. Tim McCormick, P.E. City of Los Angeles
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