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Old 02-12-2013, 11:29 PM   #8
beautifulrock
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http://voices.yahoo.com/bridge-colla...25.html?cat=72



Bridge Collapses- More Common Than You Think


The deadly Mississippi River bridge collapse on August 1, 2007 was a tragedy that is not unheard of in the United States. It is the fourth major bridge collapse since 1989. Recent collapses include:
The "earthquake proof" Cypress Freeway Collapse of October 17, 1989 in which 67 people were injured, declared missing, or killed when a 7.1 magnitude earthquake struck the area.
The Queen Isabella Causeway Disaster -September 15, 2001. Eight people lost their lives due to a multiple barge crash which collapsed the bridge support columns.
The Arkansas River Collapse -May 27, 2002. Fourteen people died as another barge hit a support beam in the state of Oklahoma.
There have been more than 500 failures of bridge structures in the United States since1989 according to a study conducted by the American Society of Civil Engineers. The age of the failed bridges ranged from the construction phase of less than a year to 157 years. The average age of bridges was 52.5 years.
Floods and collisions were the top cause of bridge failures.
Overload and impact forces from vehicles attributed 20% of the total bridge failure.Other causes are design, detailing, construction, material, and maintenance. Human-induced events occurred but were not a major factor.


That was posted in 2007. This country really needs to get it's shit together.
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