11-12. The joists of a floor in a warehouse are to be selected using square timber beams made of oak. If each beam is to be designed to carry 90 lb>ft over a simply supported span of 25 ft, determine the dimension a of its square cross section to the nearest 1 4 in. The allowable bending stress is s allow = 4.5 ksi and the allowable shear stress is t allow = 125 psi. | |
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