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Tacoma Washington Bridge Failure

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Engineering Disaster:
Tacoma Washington Bridge Disaster The Tacoma Washington Bridge was built in Washington state during the 1930’s. The bridge was made available to traffic on July 1, 1990. The bridge spanned the Puget Sound from Gig Harbor to Tacoma, which is 40 miles south of Seattle. The main font of the bridge on the Tacoma, Washington side was 28,000 feet long, 39 feet wide and the steel stiffening girders were 8 feet tall. There were four months of active life on the bridge before the failure. Many transverse modes of vibration were observed prior to November 7, 1940. The crucial event occurred at 10:00am. This directly led to the catastrophic torsional vibration which apparently caused a loosening in its collar of the north cable by which the …show more content…
A few minutes after the first piece of concrete fell, a 600 foot section broke out of the suspension font which caused a turning upside down as it crashed into Puget Sound. During the collapse, the main cables were thrown violently from side to side and were contorted and twisted after being tossed 100 feet into the air. On the north cable at mid-span, where the cable band loosened, it broke more than 350 wires. Other wires were severely stressed and distorted. The main cables were a total loss, but also salvage was undertaken. Their only value for the cause was a scrap metal. The violent collapse that broke many suspender cables. Some were lost, some were severely damaged. The Towers were the main towers, including the bracing struts that was twisted and bent. Stress beyond the elastic limit of the metal resulted in buckling and permanent distortion. Also, the Deck-Floor System was the concrete and steel of the center span that now lay on the bottom of the narrows which was deemed a total loss. The broken concrete on the side spans was the remainder, which needed for removal. Side Spans are the loss of the center section which was followed by the

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