up set beam stability
up set beam stability
(OP)
I have a situation where I need to provide an upset steel beam - unbraced top flange full length. Beams only frame into one side, and the beam is 40' long. What are opinions on putting a continuous plate on the back side of the beam along its length to create a 'tube' section for LTB? is a single fillet along the flange, in a stitch pattern, sufficient to distribute the 'stability torsion' through the section such that LTB can be mitigated?






RE: up set beam stability
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The name is a long story -- just call me Lo.
RE: up set beam stability
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: up set beam stability
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: up set beam stability
RE: up set beam stability
The fact that your bottom-ish loaded ought to help as well. I think you'd be fine here, even with your original connection unless you were planning slotted holes in the clip angles.
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: up set beam stability
If you do end up reinforcing the beam, a cap channel would be the more conventional route. I don't know if it's better than your plate except for non-structural reasons (not having a void, material handling, etc.)
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The name is a long story -- just call me Lo.
RE: up set beam stability
Koot's sketch will work very well, and even better if there is another stiffener on the opposite side of the attached purlin.
Mike McCann, PE, SE (WA)
RE: up set beam stability