桥梁深水基础钢板桩围堰受力分析与应用

Force Condition Analysis and Application of Steel Sheet Pile Cofferdam for Bridge Deepwater Foundation

为研究钢板桩围堰结构受力情况及选择合理的受力分析方法,以沪杭高速铁路横潦泾桥为例,分别采用空间有限元、平面有限元和等值梁法对钢板桩围堰的受力情况进行了对比分析,并与现场实测值进行比较,系统探讨了深水基础钢板桩围堰结构的合理计算方法。研究结果表明:空间有限元法能较好地反映钢板桩围堰实际受力状况,采用简化的等值梁法计算围堰结构偏于安全,平面有限元法分析结果介于两者之间,且实际工程中宜根据水压力特征合理选取结构分析方法。

To study the force conditions of the steel sheet pile cofferdam structure for bridge deepwater foundation and to choose a rational analysis method for the force conditions, the Hengliaojing Bridge on Shanghai-Hangzhou High-Speed Railway was cited as an example, the spatial finite element method, the plane finite element method and the equivalent beam method were respectively used to compare and analyze the force conditions of the steel sheet pile cofferdam used for the deepwater foundation of the bridge, the analysis was then compared to the field measurement values and the rational calculation method for the cofferdam was systematically studied. The results of the analysis and study show that the spatial finite element method can well represent the actual force conditions of the cofferdam, the calculation of the force conditions of the cofferdam, using the simplified equivalent beam method tends to be too safe while the calculation according to the plane finite element method is just in between the former two methods. In the calculation of the actual construction, the analysis method should be chosen rationally in considera tion of the water pressure characteristics.