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RE: Garage load on composite deck + concrete

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Why did you assume a 1’-0” width? The concentrated load will spread out to some effective width of slab. As a rule of thumb I usually assume a width equal to 50% of the span for concentrated loads on concrete slabs. I think it would be reasonable to assume the same thing here.



-----Original Message-----
From: Joe Grill [mailto:jgrill(--nospam--at)]
Friday, April 30, 2004 10:16 AM
To: seaint(--nospam--at)
Subject: Garage load on composite deck + concrete


I was just presented a design (done by another) for a 2” composite deck with a concrete topping of 2” over the deck (4” total).  The deck and concrete system is supported by steel beams spaced at 6’ o.c..  This design was for a residential garage.  I did preliminary calculations equating the moment from the allowable superimposed uniform loads (from the deck manufacturer) with the moment from a concentrated load as required by both the 2000 IBC (2000#) and the 2003 IBC (3000#) assuming that the load will act on a 1’ wide section.  I found the deck system will not work.  What do others of you do?  It looks to me like the concrete thickness will have to be increased to where a reinforced slab thickness above the deck will be adequate by itself for flexure and shear.  On the other hand, one of the manufacturers I spoke with this morning suggested getting a copy of the “Composite Steel Deck Design Handbook” by SDI.  Will that be of help in this instance?   Of course this is an ASAP thing as construction is continuing and I don’t have a copy.



Joe Grill