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Scour depth evaluation of a bridge with a complex pier foundation
Kuo-Wei Liao,Yasunori Muto,Jhe-Yu Lin 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7
A scour depth prediction formula for a river bridge is established using experimental data in which the effects of the pier, pile-capand pile group are considered. More than 170 experimental data entries, including different pier structural sizes, flow depths and soilcovering depths, are collected and verified by existing formulae, which failed to deliver a promising prediction. A machine learningprediction model was then developed to enhance the accuracy. For application purpose, a sequential quadratic programmingoptimization was adopted to construct an explicit prediction formula. The MAPE was significantly improved from 102.8 to 28.9. Theresults indicate that the proposed formula can simultaneously satisfy the requirements of accuracy and simplicity. The proposedformula has the advantages of being conceptually consistent with observed scour behaviors and provides a solid scour depthprediction, which is an important and critical step in the bridge safety evaluation if floods are considered.