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RE: Column Buckling (local buckling in HSS)

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I'm a little surprised that local buckling would be a factor, 
however, if it is, the analysis would be the same as for thin gauge material. 

Local buckling is a fairly common limit state for HSS when the diameters or flats get big and the walls thin. Check some of the b/t and D/t ratios versus the HSS Specification and you'll see how often Q is needed in the calc.