Fatigue, Lack of Backup Supports Eyed in Collapse

Structural fatigue, and the lack of a backup system in the event of a failure, may have been factors in the collapse of the Interstate 35-West bridge in Minnesota last night, experts told ABC NEWS.com. National transportation officials said it's too early to know exactly what caused the bridge to give way in Minneapolis last night. But state reports from 2001 and 2005 indicated there were fatigue cracks in the bridge's trusses, and that the bridge had no secondary system to bear the weight of...Full Story
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