Predicting Scour of Bedrock in Wisconsin : Research Brief
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2017-10-01
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TRIS Online Accession Number:01650896
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Edition:Research Brief
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Abstract:Bridge scour, the erosion or removal of sediment due to flowing water around piers or abutments, is a major cause of highway bridge failure in the United States. After the collapse of New York's Schoharie Creek Bridge during a flood in 1987, the Federal Highway Administration (FHWA) issued a technical advisory that required evaluation of all bridges to determine vulnerability to scour. Before laying the foundations for bridges, hydraulic and geotechnical engineers must estimate the depth of scour that will occur in erodible rock over the lifetime of the structure. The current method for determining foundation scour depth is based on the assumption that foundations are built over sand, which can lead to overly-conservative estimates and higher costs for bridge construction projects. The National Cooperative Highway Research Program (NCHRP) Report 717, "Scour at Bridge Foundations on Rock," recommends assessing hydraulic behavior over the anticipated life of a structure differently when foundations are laid in bedrock rather than sand. The goal of this research was to test the NCHRP methods and recommend updates to the Wisconsin Department of Transportation (WisDOT) Bridge Manual that better suit the diverse geology of Wisconsin’s waterways.
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