Let's say I have an aluminum skin, carrying a compressive load over distance "a" from frame to frame, and supported by longitudinal stiffeners equally spaced at width "b". I am sizing everything, having the required loading in lb/in. After selecting a skin thickness I can get the buckling stress of the skin based on the dimensions "a" and "b", assuming that all sides are simply supported (Bruhn chapter C5). How do I size the stiffeners? I know to check for crippling, but there must also be some minimum moment of inertia for the stiffener to provide a simple support, below which it is no longer effective at restraining the skin. Bruhn offers such an equation for stiffening a shear web in equation C10.8, but I can find nothing in Bruhn or our OEM manuals on sizing a stiffener for a panel under compression, or combined shear/compression. Can anyone offer help or point me to a reference?
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