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Engineering Disaster: The Tacoma Washington Bridge Disaster

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Engineering Disaster:
Tacoma Washington Bridge Disaster

The Tacoma Washington bridge disaster was built in Washington during the 1930s and open to traffic on July 1, 1990. It has spanned the Puget Sound from gig harbor to Tacoma, which is 40 miles south of Seattle. The main font of the bridge near Tacoma, Washington was 28000 ft. long, 39 ft. wide and the steel stiffening girders were 8 ft. tall. The bridge was open for traffic on July 1, 1940. In four months of active life of the bridge before failure, many transverse modes of vibration were observed before November 7, 1940. The crucial event at 10:00am which directly led to the catastrophic torsional vibration was apparently the loosening in its collar of the north cable by which the roadway

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