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Re: seaint Digest for 2 Nov 2008

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From: ken ng <zy7up(--nospam--at)>
Subject: Re: Residential garage floor live load >>> Code
To: seaint(--nospam--at)

The garage area is 21'x21'.  I plan to use concrete over metal deck with
steel beam support at 21'/4 spaces = 5.25' spacing.  If I used 3K concentrated
load, then I might have a little problem.  Maximum moment from point
load = P*L/4 =(3k*5.25)/4 = 3.9k-ft.  Equivalent uniform load =(m*8)/L^2
> =(3.9*8)/5.25^2 = 1143 psf.  I don't know if any concrete metal deck will
support this 3k or 1143 psf?


You may want to get a copy of the SDI Composite Deck Design Handbook. It has several concentrated load design examples. It is not as simple as converting the point load into an equivalent uniform load.

My experience with vehicle loading on concrete slabs has resulted in using the deck as a form and reinforcing the slab to support the dead and live load.


Adam Vakiener, P.E.
Structural Engineer
Southern A&E, LLC

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