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Thanks everyone for your input, I've found some formula's to use, especially Johnson-Euler solution regarding 'slenderness ratio' and which one to consider using based upon that equation.

Thanks for your input people, attached is a PDF so this might give more clarification for what I am trying to explain and need.http://files.engineering.com/getfile.aspx?folder=4ce23727-3ae7-4b92-b7dd-8a509b07dee6&file=Buckling.pdf

I am very new to this forum, how do I sketch? When I click on the pencil symbol it comes up with some text. Help? [ponder]

I am in need of help regarding 'Buckling' calculations/formula to determine the size of parallel flanged channel needed. I have been searching but i find different formulas and deciding which is right is hard. The load/force exerting upon the channel is on the 'C' or 'U' face, a pressure vessel...