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建立精确有效的2D非线性有限元模型,以研究组合桥梁中预制混凝土板和钢梁间抗剪连接件的力学性质。考虑材料非线性本构关系,采用4节点平面单元,该模型还对大梁翼缘与混凝土板以及混凝土板底部双头螺柱与混凝土之间的摩擦接触面进行了有限元分析。将数值分析结果与试验结果进行比较。每个试件中含有4个或9个双头螺柱。首先,给出能够精确模拟经典3D实际问题的2D数值分析法:等值法。然后,进行数值计算,研究摩擦系数对试件加载滑动性能的影响以及试件的内部变形与内力分布情况。最后,利用参数研究法和实际经验更好地进行连接件设计。
An accurate and effective 2D nonlinear finite element model is established to study the mechanical properties of shear connectors between precast concrete slabs and steel beams in composite bridges. Considering the material nonlinear constitutive relationship, a 4-node planar element is adopted. The model also carries out the finite element analysis on the frictional contact surface between the beam flange and the concrete slab and the concrete studs at the bottom. The results of numerical analysis and test results were compared. Each specimen contains 4 or 9 studs. First of all, we give a 2D numerical analysis method that can accurately simulate the actual problems of classical 3D: the equivalent method. Then, the numerical calculation is carried out to study the influence of the friction coefficient on the sliding properties of the specimen and the internal deformation and internal force distribution of the specimen. Finally, the use of parameter research method and practical experience to better connector design.