某预应力混凝土连续刚构桥三维有限元仿真分析

Three-dimensional Finite Element Simulation Analysis of a Prestressed Concrete Continuous Rigid Frame Bridge

预应力混凝土连续刚构桥是现代桥梁中一种非常重要的桥型[1]。现行桥梁设计一般采用杆单元进行计算分析,虽然求解速度快,但采用杆单元无法准确计算三维结构的受力,从而导致混凝土箱梁在施工和运行过程中出现裂缝问题。以实际工程为例,基于有限元软件Midas Fea,通过对比连续刚构桥考虑收缩徐变效应的三维块体模型与杆系模型计算结果的差异,得出杆系模型仿真分析的适用性和准确性,也验证了Midas Fea块体有限元仿真分析的正确性,同时展示了三维块体模型的空间受力结果。

Prestressed concrete continuous rigid frame bridge is a very important type of modern bridge[1].In current bridge design,beam elements are used for general calculation and analysis,while solving speed,but the force of three-dimensional structure can not be accurately calculated using beam element,which results crack problems in the construction and operation process of concrete box girder.Takes a practical project as an example,based on the finite element software Midas Fea,the applicability and accuracy of the simulation analysis of the continuous rigid frame bridge were obtained by comparing the calculation results of the three-dimensional block model considering the shrinkage and creep effect with that of the rod model,and the correctness of the Midas Fea finite element simulation analysis was verified.Meanwhile,the spatial stress analysis of the three-block model was displayed.