Question: Determine the maximum permissible length Lmax for a steel pipe column that is fixed at the base and free at the top and must support

Determine the maximum permissible length Lmax for a steel pipe column that is fixed at the base and free at the top and must support an axial load P = 40 k (see figure). The column has outside diameter d = 4.0 in. wall thickness t = 0.226 in., E = 29,000 ksi, and (Y = 42 ksi.

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