基于ABAQUS软件的斜桩式拱座工作性状研究

Research on the Working Behavior of Inclined Pile Arch Support Based on ABAQUS Software

为研究大断面斜桩式拱座的工作特性,采用大型有限元软件ABAQUS建立3D弹塑性有限元模型,分析弹性模量、截面形式及地质条件对拱座基础的受力影响。分析表明:基础混凝土材料弹性模量增大,其轴力、弯矩、桩顶最大拉应力相应增大,但桩顶轴向和径向位移减小;不同截面形式对桩身应力分布、桩顶位移影响较大;不同地质条件下拱座基础应力和轴力相差不大,桩身弯矩变化较大,位移变化较小。研究结果可为类似桥梁拱座基础设计提供参考依据。

To study the working characteristics of large section inclined pile arch base,a 3D elastic-plastic finite element model is established by using the large-scale finite element software ABAQUS,and the stress influence of elastic modulus,section form&geological conditions on the foundation of the arch base is analyzed.The analysis shows that:as the elastic modulus of the foundation concrete material increases,its axial force,bending moment&maximum tensile stress at the top of the pile increase,but the axial&radial displacements of the pile top decrease;the influence of the top displacement is large;different section forms have a greater impact on the stress distribution&displacement of the pile top;under different geological conditions,there is little difference between the arch foundation's stress&axial force,the bending moment of the pile body changes greatly,and the displacement changes little.The research results can provide reference for the design of similar bridge arch bases.