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I'm trying to evaluate a design based on first principles.

I have 2 trusses made from RHS (simple A frame) between which I wish to tech-screw a sheet of 2.9 mm galvanised sheet.

Loading will primarily be from material (i.e. soil to a max depth of 400 mm) being placed on the steel sheet.

I intend to analyse this setup like a beam - assume a UDL over the span, calculate reactions provided by the trusses, determine shear and bending moment diagrams.

at the point of maximum bending moment, i will evaluate the stress (σ=My/I), and hope that it is less than the yield stress of the sheet.

Am I on the right track? Does analysing steel sheets have any special rules or idiosyncracies?

Any feedback would be greatly appreciated.