Collapse of the Tacoma Narrows Bridge
In 1940, the Tacoma Narrows Bridge in Washington state collapsed. Heavy cross winds drove the bridge into oscillations at its resonant frequency. The damping decreased when support cables broke loose and started to slip over the towers, allowing increasingly greater amplitudes until the structure failed. (credit: PRI's Studio 360, via Flickr)
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Forced Oscillations and Resonance. February 23, 2013."
http://cnx.org/content/m42247/latest/
OpenStax CNX
CC BY 3.0.