Interstate 35W Bridge In Minneapolis
Published on Nov 19, 2015
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PRESENTATION OUTLINE
About 6:05 pm central daylight time on Wednesday, August 1, 2007, The Eight-lane, 1,907 Foot-long I-35 W Highway Bridge Over The Mississippi River In Minneapolis, Minnesota, Experienced A Catastrophic Failure In The Main Span Of The Deck Truss.
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As a result, 1,000 ft of the deck truss collapsed, with about 456ft of the main span falling 108ft into the 15ft deep river.
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A total of 111 vehicles were on the portion of the bridge that collapsed. Of these, 17 were recovered from the water. As a result of the bridge collapse, 13 people died, and 145 people were injured.
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Major safety issues identified in this investigation include insufficient bridge design firm quality control procedures for designing bridges and insufficient Federal and State procedures for reviewing no approving bridge design plans and calculations; lack of guidance for bridge owners with regard to the placement of construction loads on bridges during repair or maintenance activities;
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Exclusion of gusset plates in bridge load rating guidance; lack of inspection guidance for conditions for gusset plate distortion; and inadequate use of technologies for accurately assessing the condition of gusset plates on deck truss bridges.
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As a result of this accident investigation, the safety board makes recommendations to the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation officials. One safety recommendation resulting from this investigation was issued to the FHWA in January 2008.
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This could have been avoided if the bridge was properly reviewed and monitored. If the bridge was properly inspected they would have found that the gusset plates were not in the proper condition to handle the load that it had to.
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Site used
http://www.dot.state.mn.us/i35wbridge/ntsb/finalreport.pdf
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