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Re: Composite Beams vs Composite Joists

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Will,
 
    I have discussed the use of composite joist directly with one of the larger joist mfg in the past.  It was their opinion that composite joist do not become cost effective until you reach spans of 40' or greater.  At this span you may also want to look at castellated steel beams (SMI's Smart Beams).  For spans less than 40', I typically use composite steel beams or non-composite bar joist.  If you want to look at non-composite joist, try the VLH series.  The allowable loads are large enough to allow you to space the joist far enough apart to take advantage of a composite steel deck.
 
Brian K. Smith, P.E.
----- Original Message -----
Sent: Saturday, April 23, 2005 11:45 PM
Subject: Composite Beams vs Composite Joists

I am looking for some opinions on using composite steel joists instead of composite steel beams for a typical concrete floor slab in an office building. I have almost always seen composite steel beam floor slabs and I just wonder why there are not more composite joists being used?
 
I am sure it comes down to money, but I wonder how can comp. joists really be that much more expensive than beams? You also get the advantage of running the mechanical through the joists.
 
 
 
Will Haynes


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