In steel design, slenderness ratio (lambda) of a compression member is defined as ratio of effective length (Leff) to its:
AGross cross-sectional area
BMinimum radius of gyration (rmin)
COverall depth of section
DFlange width
Explanation
Slenderness ratio lambda = Leff / rmin, where rmin = sqrt(Imin / A). Higher slenderness increases buckling risk.

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