## Write a short note on economic span of a bridge, Civil Engineering

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Q. Write a short note on Economic Span of a Bridge?

The span for which the total cost of bridge will be minimum is known as the economic span.

The ratio of Cost of super structure and Cost of Sub structure = 1

Economical Span = √P / a  ,

Where -    a = p / l2 ,  p = Cost of pier ( Super structure ) ,   l = Span,

P = Cost of Pier ( Sub Structure ) ,     a = Constant of variation.

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