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Bridge construction why do modern bridges have curves in them?

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The arc is stronger and can carry more weight than a straight beam.

Very true -arcs ARE stronger. -But not exactly modern, Europe is filled with Roman viaducts made with arcs in each section Cool

What is truth -

Tensional strength of arch bridges, on the other hand is almost negligible. The natural curve of the arch and its ability to dissipate the force outward to reduce the voltage significantly below the curve.

http://www.millerconstruction.com/

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