United States Department of Transportation
i
Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments – Phase IV
-
2021-12-01
[PDF-1.76 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Report Jan 2021 - Dec 2021
-
Corporate Publisher:
-
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-through abutments against erosion. The Year 4 report uses results of simulations conducted with variable floodplain width, riprap size, channel curvature and length of the spill-through abutment to propose a new two-parameter design formula for riprap size selection for spill-through abutments placed in straight or curved compound channels. The report also discusses how the flow structure and bed shear stress distributions vary with increasing flow depth in between free-surface (FS) flow and pressurized flow (submerged orifice or overtopping) conditions in a straight channel containing wing-wall abutments protected by a riprap apron. This data is critical to propose corrections to existing design formulas for riprap size selection which were developed for the open-channel 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.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
