By finding elements that, if weakened or removed, result in a bridge failure similar to the actual bridge collapse, the investigators' work is considerably shortened. This model can perform simulations, to determine the effect on the bridge, by removing or weakening certain elements to recreate, virtually, the actual condition of the bridge just prior to and during the bridge's collapse.
Since then, the model has been improved to include the actual condition of the bridge, actual loads on it, and other factors that need to be considered in the assessment of the bridge. Within days of the collapse, development of a computer model based upon the original design drawings for the bridge began at FHWA's Turner Fairbank Highway Research Center (TFHRC) in McLean, Virginia. We do not yet know why the I-35W bridge collapsed, and the Department of Transportation is working closely with the National Transportation Safety Board (NTSB) as it conducts a thorough investigation, including a structural analysis of the bridge, to determine the cause or causes. This is a very important hearing topic in the wake of the tragic collapse of the Interstate 35 West (I-35W) bridge over the Mississippi River in Minneapolis, Minnesota. Chairman and Members, thank you for the opportunity to testify today on the Federal Highway Administration's (FHWA) bridge inspection program, and FHWA research work on bridge technology and inspections. United States Department of TransportationĬommittee on Transportation and Infrastructure Associate Administrator for Infrastructureĭirector, Office of Infrastructure Research and Development
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