The wood column is 4 m long and is required to support the axial load of 25 kN. If the cross section is square, determine the dimension a of each of its sides using a factor of safety against buckling of F.S. = 2.5 . The column is assumed to be pinned at its top and bottom. Use the Euler equation. Ew = 11 GPa, and σY = 10 MPa .
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