Question: Find the required outside diameter d for a steel pipe column (see figure) of length L = 3.5 m that is pinned at both ends

Find the required outside diameter d for a steel pipe column (see figure) of length L = 3.5 m that is pinned at both ends and must support an axial load P = 130 kN. Assume that the wall thickness t is equal to d/20. (Use E = 200 GPa and (Y = 275 MPa.)

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