United States Department of Transportation
i
Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments, Phase III
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2020-12-01
[PDF-1.69 MB]
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Edition:Final Report Sept 2019 - Aug 2020
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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 minimum median diameter of the riprap stone needed to avoid shear failure inside the riprap apron used to protect spill-trough abutments against erosion. The numerically-based approach was validated for wing-wall abutments placed in a straight channel based on data from laboratory experiments. This Year 3 report discusses results of several series of Reynolds-Averaged Navier-Stokes (RANS) simulations conducted with varying floodplain width, Bf, ratio between the abutment length and the floodplain width, La/Bf, mean diameter of the riprap stone, D50, and channel radius of curvature, R, to estimate the maximum Froude number, Fr, at which riprap stones in aprons placed at the base of spill-through abutments will resist shear failure. Analysis of the data shows that existing design formulas are not sufficiently conservative for some of the test cases conducted with straight channels. A two-parameter design formula for riprap size selection in aprons protecting abutments against local scour is proposed for spill-through abutments placed in straight compound channels. This formula will be extended for abutments placed in a curved channel.
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