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RE: Sprinkler Line Seismic Bracing

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The National Uniform Seismic Installation Guidelines which is a repackaging
of OSHPD canned solutions shows several examples of bracing to webs and
bottom flanges.

For small pipes, the torsion induced is minimal and can be resisted by the
structural element.  For large pipes and relatively long beam spans, the
torsion can be significant.

It is best to review the demand and capacity of these connections.  It is
true that there is a lot of history using bottom flange connections.  They
are easier to install.

Harold Sprague, P.E.
The Neenan Company

-----Original Message-----
From: Joshua Matthews [mailto:base.engr(--nospam--at)]
Sent: Wednesday, November 11, 1998 11:37 AM
To: seaint(--nospam--at)
Subject: Re: Sprinkler Line Seismic Bracing

> I recently reviewed some fire sprinkler shop drawings that had a typical
> detail indicating a diagonal seismic (sway) brace which was indicated as
> being connected into the bottom flange of the structural steel roof &
> floor beams (perpendicular to the beams).  When we informed the frie
> sprinkler sub contractor that this would create torsion that the beam was
> not designed for we received the response that "this is the way it is
> always done and no one else has ever questioned it"

Has anyone else had similar experiences? This is a national fire sprinkler
contractor that works all over the US including California.  It is going to
be a cost item for the project since the fire sprinkler subcontrator is
saying that the job was bid this way and will be more expensive to lengthen
the braces to connect them to the top flange of the steel beam.

Thanks for any responses,

Joshua Matthews.