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RE: Ceiling seismic restraint

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> -----Original Message-----
> From: Bruce Holcomb [mailto:bholcomb(--nospam--at)brpae.com]
> Sent: Monday, April 07, 2003 2:07 PM
> To: Seaint (E-mail)
> Subject: Ceiling seismic restraint
> 
> 
> I have a building designed to the '99 BOCA with Av=0.13 and 
> Aa=0.12; Seismic Hazard Exposure Group II; Seismic 
> Performance Category C.  I need to specify seismic restraint 
> of the ceiling (some lay-in and some gypsum board).  I found 
> some info in a drawing from ATC on the web, but it showed 
> only using wire restraints.  A co-worker says I need to 
> specify struts... basically a small stud vertical and 
> diagonal brace at some spacing, but he can't remember the 
> particulars and can't find a reference.  The reason for the 
> struts is to avoid having the panel fall out due to vertical 
> movement of the ceiling grid system under seismic loading.  
> Can anyone give me some guidance?
> 
> 
> Bruce D. Holcomb, PE
> Butler, Rosenbury & Partners
> 300 S. Jefferson, Suite 505
> Springfield, MO 65806-2217
> ph (417) 865-6100
> fax (417) 865-6102
> 
> 
> 
> 
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