Assessment of HEC-18 equations for NCHRP abutment scour based on Kansas field data
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Abstract
Bridge failures are caused by many different failure mechanisms, not the least of which is scour. Scour occurs due to the erosion of streambed or bank material due to flowing water and is often considered as being localized. Recently the National Cooperative Highway Research Program (NCHRP) drafted a final report titled "Estimation of Scour Depth at Bridge Abutments, NCHRP 24-20." The method outlined in this document was adopted by HEC-18 as an alternative method for use in the estimation of scour depths due to abutment scour. This new method requires field review. The purpose of this report is to verify the validity of the NCHRP Abutment Scour Equations derived from laboratory studies. Given the requirement by several states to use the new method, finding the right equations to use for the design foundations becomes crucial. The advantage of this study is the abundant field data available for a comparison through the Kansas Department of Transportation project headed by TranSystems. A subset of the bridges is tested with the equations and comparisons are made.
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Introduction -- Literature review -- Methodology -- Results -- Discussions -- Conclusions -- Future work -- Appendix
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M.S.