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RE: AISC LRFD- composite beams

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I am a big fan of LRFD composite beam construction and use it anytime I get
the opportunity.  Some of the "things" that cost money that you may not be
taking into consideration are the cost of the studs ($1 to $2 each
installed, just guessing)and the cost to camber the beam.  I have seen some
discussion regarding the use of partial composite action to decrease the
number of studs and thus the cost.  I believe Charlie Carter with AISC
educated me on this topic in Cleveland about a year ago, I am sure he can be
of more help.

Brian K. Smith, P.E.

> -----Original Message-----
> From: marfra(--nospam--at) [mailto:marfra(--nospam--at)]
> Sent: Tuesday, January 18, 2000 8:16 PM
> To: seaint(--nospam--at)
> Subject: AISC LRFD- composite beams
> I find it strange that most texts including the Salmon & Johnson advise
> that using steel beams composite with concrete slabs generate savings of
> 20% to 30%.
> The design charts and calcs indicate a considerably higher saving
> particularly when beams under 16" are used with slabs 5" and over.This
> is quite common for most buildings under 4 stories high. Deflections
> usually are also fine.
> A typical W10X15 has an permissible Mn of 43 kip ft . When composite
> with a 5" slab the permissible is generally over 75 kip ft. Im I doing
> something wrong
> Mark Francois