宽箱组合梁桥施工过程中受力的有限元仿真分析

Finite Element Simulation Analysis of Mechanical Behavior of Wide Composite Box-Girder Bridge During Construction

宽箱组合梁的混凝土桥面板宽度很大,桥梁施工过程复杂,结构不满足平截面假定,用梁理论难以分析结构的受力。利用ANSYS有限元程序建立宽箱组合梁的板壳和实体模型,采用荷载增量步骤技术和单元生死技术,实现桥梁从施工到成桥全过程的受力仿真分析。结合某一五跨连续组合箱梁桥,根据施工顺序详细介绍对其仿真分析的方法。计算结果表明,该方法能够十分精确地模拟构件实际受力全过程,为多跨组合梁桥施工方案的选取提供了一种有效的验证手段。

The analysis of mechanical behavior of wide box composite girder is difficult by beam-column theory,for the width of concrete deck is very large and the construction processes are complicate,furthermore the structure is not agree with plane cross-section assumption.Shell and solid model of wide box composite girder was developed by ANSYS finite element program.Simulation analysis of bridge behavior was performed from its construction state to complete state by adopting the techniques of loading increment step and element birth/death technology.Combining a five spans composite box-girder continuous bridge,the simulation analysis method is introduced in detail based on its construction sequences.The results show that this method can be used to calculate member stress and deformation in its full construction procedures efficiently,and it is an effective method to test the construction scheme of continuous composite bridge.