钢管再生混凝土柱-钢梁节点抗震性能非线性有限元分析

Nonlinear Finite Element Analysis on Joints in Composite Frames with Recycled Concrete-filled Steel Tubular Column and Steel Beam

为了研究钢管再生混凝土柱-钢梁框架节点的抗震性能,基于已进行的试验,在选取合适的本构关系后,选用大型有限元软件ABAQUS对试验中的不同再生骨料取代率下框架节点进行非线性分析;并在已建立的模型的基础上,改变轴压比和梁柱线刚度比参数,探究不同试验参数对节点抗震性能的影响。研究结果表明,将理论计算得到的滞回曲线和实测滞回曲线对比后发现吻合较好,钢管再生混凝土柱-钢梁节点具有较好的耗能能力,不同骨料取代率对节点的抗震性能影响不明显;轴压比对节点弹性阶段无明显影响,增大轴压比不利于节点的后期承载力;梁柱线刚度比越大,有利于节点的初始刚度和承载能力的提高;研究成果可为该类节点的工程实际应用提供理论支撑。

In order to study the seismic behavior of joints in the composite frame with recycled concrete-filled steel tubular column and steel beam under cyclic reversed loading,based on experiment result,the rational constitutive relation of material is chosen,nonlinear finite element analysis of frame joint underdifferent recycled aggragate replacement rations is carried out by ABAQUS software.Based on the established model,the finite element software ABAQUS is employed to analyze the influence of the axial compression ratio and line stiffness ratio.The results indicate that the simulated hysteretic curves are well agreed with the experimental date.The joints in the composite frame with recycled concrete-filled steel tubular column and steel beam have a good energy dissipation capacity,and different recycled aggragate replacement rations have no significant effect on the seismic performance of joints.The axial compression ratio has no significant effect on the initial stiffness.With the increasing of axial compression ratio,but the capacity in the later become worse.With the increasing of line stiffness ratio,the capacity and initial stiffness would be improved obviously.The results provide reference for experimental and engineering design.