What happened to the Tacoma-Narrows suspension bridge?

In 1940, the new Tacoma-Narrows bridge (853 meters) was struck by high winds, causing the bridge to undulate and buckle. This was caused by an engineering error which allowed one of the bridge suspensions to unbuckle in the wind. The loss of one suspension would then cause the bridge to move in a wave-like motion, almost like a ribbon. The accident in 1940 had prompted the bridge designers and engineers to design suspension bridges more cautiously.

Tacoma-narrows-bridge-collapse

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