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Composite Beams vs Composite Joists

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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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