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RE: Gypsum board for bracing in 03 IBC Seismic Design Category D

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I agree about they are a bad idea. I know R=2.

 My main question was that before they allowed you to only use 50% of the
capacity in the Table for Seismic Design Category D and they noted the table
was intended for Seismic Design Categories A, B and C.  In the new code there
is no reference to allowing 50% of the table value in Seismic Design Category
D.  Does this mean there is no design value for SDC D now?

-----Original Message-----
From: Dan Morrow [mailto:dmorrow(--nospam--at)swensonsayfaget.com] 
Sent: Tuesday, October 04, 2005 11:51 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Gypsum board for bracing in 03 IBC Seismic Design Category D

Scott,
Althoough you mentioned the table from the wood chapter, steel studs may
be an option for you.  Table 2211.2.3 provides shear values with steel
studs.  Also see 2211.2.2.3 item 7.  Seems like R=2 is required.  I
personally don't believe in gypboard shearwalls for seismic (cyclic)
loads as it seems like after 1 or 2 cycles, the gyp at the nails or
screws is crumbled and offers no resistance.
Regards, 

Dan Morrow, PE

> -----Original Message-----
> Subject: Gypsum board for bracing in 03 IBC Seismic Design Category D?
> From: "Haan, Scott M POA" <Scott.M.Haan(--nospam--at)poa02.usace.army.mil>
> To: <seaint(--nospam--at)seaint.org>
> 
> Anyone:
> 
> Per the 2003 IBC can sheetrock be used to brace buildings in 
> Seismic = Design Category D?  What values are supposed to be used?
> 
> 
> 03 IBC Table 2306.4.5 footnote a indicates "....Values shown 
> are for short-term loading due to wind or seismic loading in 
> Seismic Design Categories A, B and C..."  00 IBC Table 
> 2306.4.5 footnote a read "Values shown are for short-term 
> loading due to wind or seismic loading in = Seismic Design 
> Categories A, B and C.  Values shall be reduced by 50 percent 
> in Seismic Design Category D...."
> 

> 
> 03 Table 1617.6.2  1. L still allows a height of 35 feet for 
> light = framed bearing walls braced with materials other than 
> wood panel but it looks = like the gypsum shear values are no 
> longer provided.

> 
> Thanks.
> 
> Scott
> 


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