To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: Plywood Floor Diaphragm Shear Values
From: Paul Crocker <paulc(--nospam--at)ckcps.com>
Date: Mon, 18 Feb 2002 10:03:04 -0800
Does anyone have any
experience or a good reference regarding calculating plywood floor diaphragm
shear values for conditions other than those listed in UBC Table 23-II-H?
I was reading the table recently, and it occurred to me that the largest
diaphragm values are for 19/32" plywood, while I typically call out 23/32"
plywood. Also, on at least one project I am using TJI 250s, which are
slightly wider than 2x member but not as wide as 3x members (the only two sizes
shown in the table). I would assume that I could use slightly larger
values for these conditions compared to 2x members and 19/32" plywood, but I am
not sure how to go about calculating this since there are quite a few mechanisms
that could control, and I would guess that most of these are based on
testing. Any suggestions or references would be appreciated.