Why did the tacoma bridge collapse?
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The Tacoma Narrows Bridge collapsed due to aeroelastic flutter, a phenomenon that occurs when the wind causes the bridge to vibrate in a way that amplifies its oscillations and eventually leads to structural failure.
The bridge lacked stiffening girders and large crosswinds of 40 mph (64 km/h) caused the bridge to vibrate at a frequency similar to the natural frequency of the bridge, creating resonance and amplifying the motion until the bridge collapsed.