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RE: Steel Beam/Metal Deck - Lateral Bracing

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Once the deck is installed and cured, I believe your unbraced length is still the distance between fasteners of the deck to the beam.  The concrete deck is really going to give you some relative stiffness and provide you with enough lateral bracing to actually consider it braced.  Contruction loading may be your more serious case.  Because the deck is installed parallel, you are not using the strength that it could provide.  That being said, I would ignore it for construction loading and see what you come up with.  Your construction load and live load may be similar, and thus, using the entire length unbraced may not be a bad thing.  Also, look at both cases.  How much bigger would the beam size get if you had a full unbraced length, as opposed to bracing every foot or so.  Going with the conservative option may not increase member size all that much.  And if there isn't a large amount of these types of loaded beams, the you should be OK with the conservative approach.
 
Dave Maynard, PE
Gillette, Wyoming
-----Original Message-----
From: Eknrinc(--nospam--at)aol.com [mailto:Eknrinc(--nospam--at)aol.com]
Sent: Wednesday, November 17, 2004 1:32 PM
To: seaint(--nospam--at)seaint.org
Subject: Steel Beam/Metal Deck - Lateral Bracing

Does anyone know of any commentary regarding the use of appropriate beam unbraced lengths when a steel beam span is parallel to a 3" (Verco W3) 20 ga metal deck with 6 1/4" LT WT concrete fill? Thanks in advance