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Re: Compression flange bracing

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Here at ADM we do not consider the bar grating as lateral support for two
reasons.  Even when called for on the drawings, the required connections are
not always made.  The beams supporting the grating can be loaded when the
the bar grating is not installed by construction, and maintenance activity.

Paul Martin
-----Original Message-----
From: plec <plec(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Monday, November 01, 1999 11:29 AM
Subject: Re: Compression flange bracing

>I know this is drifting a little, but I would like to know if there is a
>general concensus on the subject of whether bar grating should, or should
>not be counted on as lateral bracing for the beam on which it rests.  I
>realize that if it were welded then there would be no question but often
>times the only connection is 2 clips per end and one near the midspan - and
>these clips are not always very tight.  I have been designing my industrial
>buildings as if the beams are braced but I also require special connecting
>of the grating.  I show a detail on the drawings that requires a connection
>at each location where the grating passes over a beam.
>>At 12:45 PM 10/29/99 -0500, you wrote:
>>>From over 30 years ago...  In design of power plants (non-seismic area),
>>>asked how we could consider bar grating as lateral support for the top
>>>flange of grating-support members.  The answer was that the beams would
>>>be loaded if it weren't for the load on the grating.  If the beams are
>>>loaded, we can count on a 20 percent coefficient of friction for lateral
>>>support.  And 20 percent of the vertical load is gracious plenty for
>>>lateral support.