基于分项系数法的板桩式坞墙稳定性设计

目前现行的JTS 190—2018《船厂水工工程设计规范》规定板桩式坞墙稳定性按照JTS 167—2018《码头结构设计规范》中有关板桩码头的相关条文进行验算,但板桩码头的水压力比坞墙小,直接采用板桩码头“踢脚”稳定性验算的分项系数表达式和分项系数取值是否合理有待研究。通过校准按旧规范JTJ 252—1987《干船坞设计规范(水工结构)》设计的板桩式坞墙稳定性的可靠度,得出板桩式坞墙“踢脚”稳定性的目标可靠指标,并确定按现行规范设计时的坞墙稳定性可靠指标。结果表明,板桩式坞墙“踢脚”稳定性的目标可靠指标应取4.0,而按现行规范设计时的可靠指标均值略大于4.0,故现行规范中分项系数的取值是合理的。

Design for stability of sheet piled dock wall based on partial factor method

In the JTS 190-2018 Design Code for Maritime Structures and Services in Shipyard,the stability of sheet piled dock wall should be checked in accordance with the relevant provisions of sheet piled wharf in JTS 167-2018 Design Code for Wharf Structures.However,the water pressure for piled wharf is smaller than that of the dock wall.Thus,the rationality of directly using partial factor format and factor values for the stability of sheet piled wharf should be verified.Through the calibration of reliability for the stability of sheet piled dock wall,which is designed by the old code JTJ 252-1987 Code for Design of Dry Dock(Hydraulic Structures),the target reliability index is determined,and reliability indexes for wall designed by current practice are determined.The results show that the target reliability index of stability for sheet piled dock wall should be 4.0,while the average value of reliability index for wall designed by the new code is slightly larger than 4.0,which validates the rationality of factor values utilized in the current code.