RE: wood / gyp board shear walls for resisting seismic forces[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: wood / gyp board shear walls for resisting seismic forces
- From: "Haan, Scott M POA" <Scott.M.Haan(--nospam--at)poa02.usace.army.mil>
- Date: Tue, 17 May 2005 11:41:15 -0800
I think the intent is to not use wood shear walls to brace structural masonry not a veneer. Veneer is an architectural finish. They don’t want you using wood shear walls for buildings taller than 2 stories when the structural shell of the building is masonry.
2305.1.5 says you cannot use wood shear walls to support concrete construction. What about a 3 story light frame timber residence with in-floor heat slabs on the two upper floors? Wood shear walls would have to resist forces from the topping slabs. This is an architectural finish again, not concrete construction.
From: Bruce Holcomb
We are designing a 4-story, wood-framed hotel with the 2 bottom stories having a masonry veneer. We are designing to the 2003 IBC in a relatively low seismic region. We want to use wood-sheathed shear walls at the ends of building and take advantage of the numerous gyp board-sheathed walls to resist wind and seismic forces. But according to Table 2306.4.5, footnote a, we can’t use gyp board walls to resist seismic forces because we have 2 stories of masonry veneer and according to IBC section 2305.1.5, we can’t even use wood-sheathed shear walls to resist seismic forces because we have 2 stories of masonry veneer and the building is over 2 stories high. Even though wind controls the lateral force analysis, we’re detailing for seismic to comply with the code.
Are we reading the code correctly? What is the reasoning behind the code not allowing gyp board or even wood-sheathed shear walls to resist horizontal forces contributed by masonry or concrete construction?
Bruce D. Holcomb, PE, SE
Structural Engineer & Vice President
Butler, Rosenbury & Partners
319 North Main, Suite 200
Springfield, MO 65806
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