Tacoma Narrows Bridge collapse |
English cavalry troops marching across a foot-bridge in 1831 caused the bridge to collapse when they marched in rhythm with the natural frequency of the bridge. Winds can also cause vibrations in suspension bridges. On November 7, 1940, vibrations caused by a mild gale produced resonance in the Tacoma Narrows Bridge in the state of Washington. In a few hours, the flexible suspension bridge was torn apart and collapsed. Engineers now design suspension bridges with heavier, less-flexible roadbeds that aren't affected by wind.
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