Crane runway beam with channel cap on W-beam 2

tnteng · Apr 25, 2007

I am trying to select an appropriate W-beam and channel cap for a runway beam that is to support an under running bridge crane. The channel cap is to be on top of the W-beam. I am using the AISC ASD code and I am having problems with what value to use for "bf" in formula F1-2. Would "bf" be the width of the channel flange or the width of the W-beam flange? Am I correct in assuming that "Af" in that formula would be the sum of the area of one flange of the W-beam and the area of the web of the channel.

Also in section B.5.1, on the check for compact or non-compact section, b/t is compared to 65/sqrt(Fy). What value of "b" & "t" should be used in this case with the composite section?

Thanks in advance for any help with this problem.

Tony Billeaud
Mechanical Engineer

271828 · Apr 25, 2007

Can you switch to the 13th Edition Spec.? Section F4 is more applicable than the old 89 ASD stuff.

As for flange compactness, the compression (top) flange is a stiffened element in this case because it's connected to the channel. Using 65/Sqrt() is very conservative. The bottom line is that standard W-shapes are almost always compact using 65/Sqrt(), so are waaay compact when stiffened.

dik · Apr 25, 2007

Check the AISC site for an excel spreadsheet to use as a guide for this...

Dik

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Crane runway beam with channel cap on W-beam 2

tnteng

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