United States Department of Transportation
i
Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments – Phase V
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2023-05-01
[PDF-2.64 MB]
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Corporate Contributors:United States. Department of Transportation. Federal Highway Administration ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; University of Nebraska. Mid-America Transportation Center
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Edition:Final Report Jan 2022 – May 2023
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Abstract:Maintaining road operations requires reliable and safe transportation infrastructure design, in particular for bridges that need to remain operational during floods and other extreme weather events. A numerically based investigation is carried out to determine the critical discharge and Froude number to avoid shear failure inside the riprap apron used to protect spill-through and wing-wall abutments against erosion. The focus is on cases when the flow regime is pressurized at the bridge site. The Year 5 Report discusses how the bed shear stress distributions induced over the riprap apron protecting wing-wall and spill-through abutments placed in a straight compound channel vary with increasing flow depth. The study considered cases where the flow at the bridge site is in the free-surface (FS) flow regime and in the pressurized flow (submerged orifice or overtopping) regime. This data is critical to propose corrections to existing design formulas for riprap size selection which were developed only for the free-surface flow regime such that estimates of the critical Froude number can be provided for cases when the bridge deck becomes submerged at high flow conditions.
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