The cross section of a narrow-gage railway bridge is shown in part (a) of the figure. The
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The spacing of the girders is s1 = 50in and the spacing of the rails is s2 = 30in The load transmitted by each rail to a single tie is P = 1500lb. The cross section of a tie, shown in Part (b) of the figure, has width b = 5.0in and depth d. Determine the minimum value of based upon an allowable bending stress of 1125psi in the wood tie. (Disregard the weight of the tie itself.)
a.
b.
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