walls in the '94 quake and vowed never to use it again as a shear resisting
material EVER.
Two problems in my view. First, it stinks as a lateral resisting element;
it gets cut up and pieced whenever needed, and second, I like it when a GC
starts a remodel, opens up a wall, finds plywood and immediately thinks he's
found a shear wall and (if he knows anything about construction) acts much
more cautiously. That never happens with drywall shear walls because there
is no distinction; it's just another wall.
-DB
-----Original Message-----
From: Drew Morris [mailto:dmorris@bbfm.com]
Sent: Thursday, September 20, 2007 6:11 PM
To: SEAINT
Subject: Gypsum wallboard shearwalls
We are having a minor discussion in our office over gypsum wall board as
shearwalls. The 2006 IBC gives allowable shearwall values (Table
2306.4.5) for unblocked and blocked walls for wind and seismic loading.
The IBC 2006 references ASCE 7-05 which list this type of load bearing
walls in Table 12.2.1 (Line A/15) with R=2. In Seismic Design Category
D, buildings with these shearwalls are permitted but limited to 35 feet
in height. Can you use gypsum wall board for shearwalls? Some of us
thought that this type of shearwall was not allowed in SDC D.
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