The forces on this bridge

Compression- The arch is squeezed together, and this squeezing force is carried outward along the curve to the supports at each end. The supports, called abutments, push back on the arch and prevent the ends of the arch from spreading apart.

The arch bridge has great natural strength. Thousands of years ago, Romans built arches out of stone. Today, most arch bridges are made of steel or concrete, and they can span up to 800 feet.

The Arch Bridge

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TYPES OF BRIDGES

HOW DO I KNOW?
To know if an arch bridge is an arch bridge who simply look for arches (like half circles)