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Arch bridges are always under compression. The force of compression is pushed outward along the curve of the arch toward the abutments.The natural curve of the arch and its ability to dissipate the force outward greatly reduces the effects of tension on the underside of the arch. The greater the degree of curvature (the larger the semicircle of the arch), however, the greater the effects of tension on the underside.Therefore, if the arch is a perfect circle, the tension is negligible.

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