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RE: Steel floor plate
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Steel floor plate
- From: <William.Sherman(--nospam--at)CH2M.com>
- Date: Mon, 12 Mar 2007 08:31:20 -0600
Actually my application "is" an industrial application -
the plate will be used at a platform to be used regularly to access
equipment. I don't want the floor plate to feel excessively "bouncy", so I
am trying to establish the criteria to use for deflection. And I will need
to justify this criteria to other reviewers. It is not clear to me whether
AISC's "deflection-controlled" table will accomplish this goal.
I currently plan to use criteria consistent with grating
design based on historical practice. However, this platform is movable, so
we want to minimize its weight. If I can justify less stringent criteria,
then I could reduce the weight.
CH2M HILL / DEN
The deflection limit applies to industrial applications
where deflection does not affect serviceability.
Use a lower limit when deemed
Table 3-18a in the AISC 13th Edition
provides tabulated allowable uniform loads for "deflection-controlled
applications". The deflection limitation used is L/100. For a 4-ft
span, the maximum deflection would be about 1/2-inch - this seems rather
"bouncy" to me. Grating tables typically recommend a limit of 1/4-inch
deflection under 100 psf live load for comfort - but a 3/8-inch plate at a 4-ft
span designed per AISC would have about twice that
What is the basis for the L/100
allowable deflection? Does this limit provide adequate stiffness for