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Failure of member due to eqn. H3-6(AISC)

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Vipin Satheesh

Structural
Oct 22, 2017
4
Attached is the staad model of a cladding support I have been designing. I cant seem to shake off the failure of two members due to H3-6(combined torsion and flexure).
I have tried releasing moment as well as providing braces and changing member size.
Please can anyone look into it and find a solution.
 
 https://files.engineering.com/getfile.aspx?folder=963759d7-320f-4015-a42c-23ae725d6540&file=PR218-003-FS09-007-MODEL_AFTER_REMOVING_CLASHES_WITH_CONCRETE_-R7.std
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Definitely one of the most odd-ball models I've seen. In any case, I couldn't get any sizes to work either. I suspect it has something to do with the fact this is a enforced displacement model and these members are on a curve. I.e. the stiffer the member is, the more force that gets sucked in (for a lack of a better way to put it). Of course, going with the smaller members.....it didn't work either. I think you are probably going to need more releases.

Something that jumped out at me in the post-processing (aside from a million warnings): no stresses in any of the plates. Speaking of the plates, they are extremely thin.

What is this thing anyway?

[red]EDIT:[/red] Adding releases, I got it to run with no failures.
 
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