大跨度连续梁桥钢混结合段有限元建模方法对比分析

Comparative Analysis of Finite Element Modeling Methods for Steel-concrete Composite Segments of Long-span Continuous Beam Bridge

摘要:

以沪渝蓉高速铁路天门汉北河特大桥为例，建立了模拟与不模拟剪力键的钢混结合段有限元模型，从结构刚度、应力和钢梁传力过程等角度对比了2种模型计算结果的差异。结果表明：是否模拟剪力键对钢混结合段的刚度基本没有影响；2种模型得到的混凝土梁正应力最大相差0.1 MPa，钢梁von Mises应力最大相差26.8 MPa，应力差异最大的部位是钢格室隔板的PBL键开孔处；不模拟剪力键模型得到的钢梁顶板、底板和腹板的传力过程更符合实际。

Abstract:

Taking Tianmen Hanbei River Bridge of Shanghai-Chongqing-Chengdu High-speed Railway as an example, the finite element models of simulating and not simulating the steel-concrete composite segment with shear connectors are established to compare the differences of two model calculation results from the perspectives of structural stiffness, stress, and force transfer process of steel girder. The results show that whether shear connectors are simulated or not has no effect on the stiffness of the steel-concrete composite segment. The maximum difference of normal stress between the two models is 0.1 MPa. The maximum von Mises stress difference of steel beams is 26.8 MPa. The greatest stress difference occurs at the opening of PBL shear connector of steel cell partition. The force transfer process of the top plate, bottom plate and web plate of the steel girder obtained without simulating the shear connector model is more realistic.