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RE: Fire Wall

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I don't think you have to allow the building to collapse on either side of 
the fire wall unless it's classified as a building separation wall. You 
should check with the architect to determine whether it's classified that way 
in the code. I can't remember having to treat a 2 hour wall this way. I 
remember always having 4 hour walls at building separations, but the fact 
that it's a concrete structure may have something to do with it (area also).

If it is a building separation wall, and you need to isolate the wall, there 
are manufacturers that make "break-away" connections that allow the structure 
to fall away and leave the wall standing. Be careful not to rely on structure 
to brace the wall if you intend for the structure to collapse in a fire.

William R. Keen, PE
Director, Structural Engineering
Clark Nexsen
Architecture & Engineering
6160 Kempsville Circle, Suite 200A
Norfolk, Virginia 23502
757 455 5800 Fax: 757 455 5638


-----Original Message-----
From: Bouffard, Tom On Behalf Of Bouffard, Tom
Sent: Thursday, November 19, 1998 10:46 AM
To: Seaint (E-mail)
Subject: Fire Wall



I have a job (low seismic risk, Av=0.05) that requires a 4 story, 2 hour
rated fire wall between a new 7 story addition and the existing 4 story
building.  Both the buildings are 2 hour rated concrete framed buildings.
We plan on using a masonry fire wall and would like to brace it to the new
construction.  Does anyone know of any type of attachment that would be
appropriate for these connections.  Based on the fire wall principle that
either building should be able to collapse without the fire wall loosing
it's ability to perform.

Tom Bouffard