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A timber column, 8 in. by 8 in. in cross section, is reinforced on all four sides by steel plates, each plate being 8

A timber column, 8 in. by 8 in. in cross section, is reinforced on all four sides by steel plates, each plate being 8 in. wide and t in. thick. Determine the smallest value of t for which the column can support an axial load of 300 kips if the working stresses are 1200 psi for timber and 20 ksi for steel. The moduli of elasticity are 1.5 x 106 psi for timber and 29 x 106 psi for steel.

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