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Cold Form Section Arch Buckling or Unsupported Length?

Baffled Engineer

Structural
Jul 27, 2018
62
I'm completing a review of a quonset made with cold-formed sections that gets crimped side by side as sketched below.
The arch is about 15.2m across and 6.7m high and is pinned both ends. The cold-form section will have internal compressive axial forces and bending moments.
I was wondering what would be the appropriate global buckling length (for compression) and unsupported compression flange length (for flexure) to consider?

1745937752485.png
1745937781987.png
Thank you!
 

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