How to specify the optimum number of piers

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Two girder designs are under consideration for a bridge for a 1,200-foot crossing. The first is expected to result in a superstructure weight per foot of 22(S) + 800, where S is the span between piers. The second should result in superstructure weight per foot of 20(S) + 1,000. Piers and two required abutments are estimated to cost $220,000 each. The superstructure will be erected at a cost of $5.40 per pound. Choose the girder design that will result in a minimum cost and specify the optimum number of piers.

Reference no: EM13223451

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