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WF steel beam flange check against torsion if stiffener is needed

WF steel beam flange check against torsion if stiffener is needed

WF steel beam flange check against torsion if stiffener is needed

(OP)
I have a WF beam with WF post. The WF post is free standing so there's some moment at the base due to wind.
Looking for a reference to check the WF top flange to resist this torsion.

I will look at the AISC steel manual and other steel book but this forum may direct me much faster to a link how to check this.

RE: WF steel beam flange check against torsion if stiffener is needed

Doubt you'll find anything concrete telling you how to proceed. Modern steel construction had an article about lateral loading from monorails causing bending in the web, that would provide some guidance on how much of the web to use in resisting the load. I would say do some quick conservative yield line checks on the flanges - if they have plenty of capacity you're ok. If you're not comfortable with the results from that probably cheapest for the client to just toss in some stiffeners and call it good rather than turn it into a science project.

RE: WF steel beam flange check against torsion if stiffener is needed

I'm not 100% certain I follow what exactly is happening here......but I can tell you that a stiffener is meaningless as far as torsion goes. It's along for the ride.

RE: WF steel beam flange check against torsion if stiffener is needed

Sketches would help.

RE: WF steel beam flange check against torsion if stiffener is needed

(OP)
i want to check the flange local bending

RE: WF steel beam flange check against torsion if stiffener is needed

You could resolve the force into components and check it as per AISC's equations for prying/flange bending. But looking at that setup.....you will likely have issues with torsion on the W12s (and it's connections at its ends, unless they are moment connections) before you have trouble with that flange. (Unless there is additional framing not shown.)

RE: WF steel beam flange check against torsion if stiffener is needed

(OP)
there are intermediate W beams connected to the W12 beam. that should help prevent torsion of web but won't help the top flange.

RE: WF steel beam flange check against torsion if stiffener is needed

Put stiffeners under the column flanges. There's still room in our profession for rational design. If this thing depends on the torsional contribution of the supporting beam, then you've got to reach out and grab the bottom flange somehow.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: WF steel beam flange check against torsion if stiffener is needed

Place your perpendicular beams at the location of the posts and use full-depth shear tabs for the end connections of those beams. You won't have to analyze anything.

RE: WF steel beam flange check against torsion if stiffener is needed

"there are intermediate W beams connected to the W12 beam. that should help prevent torsion of web but won't help the top flange."

Where are those intermediate beams located, how are the oriented, and how are the "attached. " ?

RE: WF steel beam flange check against torsion if stiffener is needed

(OP)
Beam is existing and difficult to field weld stiffener may not even be possible to do it due to a lot of interference.

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