The APA has a publication for this. There is no discussion in it regarding
slightly wider giving slightly more. Also thicker PW will not necessarily
give you more load since the nails will govern the design.
Richards, P. E.
-----Original Message----- From: Paul Crocker
[mailto:paulc(--nospam--at)ckcps.com] Sent: Monday, February 18, 2002 10:03
AM To: 'seaint(--nospam--at)seaint.org' Subject: Plywood Floor
Diaphragm Shear Values
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