Angers Bridge

 

Angers Bridge was a suspension bridge that collapsed in France in 1850.  Soldiers were marching over the bridge in unison.  This caused the bridge to resonate, and eventually collapse.  Since then, when soldiers march across a bridge they are instructed to break their step.  This ensures that the bridge does not begin to vibrate, resonate, and fail.

This is a video of the opening of the Millenium Bridge in 2000.  People walking across the bridge caused lateral resonance.  The bridge did not fall, but they closed it for about two years after this walk to fix the problem.

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