海河蚌埠桥大吨位支撑构件模型有限元分析

Study on model of large-tonnage bracing member of Tianjin Haihe Bengbu Bridge

天津海河蚌埠桥主体结构为特异三维空间网状构造,受力复杂。桥梁在运营过程中的实际工作状态直接影响桥梁的安全性。在进行模型试验之后,使用有限元软件进行建模计算。与试验结果对照,以此评价本工程设计的安全性。通过分析,我们计算得到构件应力分布情况,研究了拉压荷载下撑杆的受力情况。而且通过对计算结果与试验数据的比较可以认为该拉压杆支撑构件能够满足受力要求。

Tianjin Haihe Bengbu Bridge is built in CBD of Tianjin city and crosses the Haihe River; it is dissyrnmetrical steel bridge of three dimensions Beam - Arch Combination System. The bridge is complex for both mechanical and tectonic consideration. The bracing member of abutment 1st and 6th are designed specially, which connect the main girder of the bridge and the rubber bearing of abutment. These buttress braces are designed uniquely in the world, in order to transfer large - tonnage axial load, including com- pressive force and tensile force, to beatings. The loading behavior of them are significant effect to the security of the bridge and need to be analyzed specially, so a 1：2.5 - scale model is made, destructive experiment of experimental member is done. Experiment member is elastic based on experimental data at tension load; limit axis load is 3002kN when the member is buckling. Except model experiment, a finite element analysis of model is also essential. Through experiment and finite element analysis, the reliability and safety of the bearings are verified.