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为实现钢-混凝土组合简支梁滞回性能三维非线性有限元分析,该文提出混凝土在单轴拉、压应力下的损伤变量计算方法,给定了混凝土的卸载规则,完善并提出混凝土应力-应变滞回本构关系和钢材循环本构关系,应用ABAQUS有限元软件建立混凝土棱柱体试件、钢材试件和钢-混凝土组合简支梁有限元三维非线性有限元模型,对混凝土棱柱体试件在单轴受压和受拉反复荷载下的试验结果进行分析,对钢材试件在单轴拉压循环荷载下的试验结果进行分析,对钢-混凝土组合简支梁在循环荷载下的荷载-挠度滞回关系、梁端荷载-滑移滞回关系以及栓钉的荷载-侧向变形滞回关系曲线等试验结果进行分析,计算结果与试验结果符合较好。
In order to realize the three-dimensional nonlinear finite element analysis of hysteretic behavior of steel-concrete composite simple-supported beams, a method to calculate the damage variables of concrete under uniaxial tension and compressive stress is proposed. The rules of concrete unloading are given, and the concrete stress - Strain Hysteresis Constitutive Relationship and Steel Cycle Constitutive Relationship, a finite element model of three-dimensional finite element of finite element of concrete prism specimen, steel specimen and steel-concrete composite simply supported beam was established by using ABAQUS finite element software. The test results of the specimens under uniaxial compression and tensile load are analyzed. The test results of the steel specimens under uniaxial tension-compression cyclic loading are analyzed. For the steel-concrete composite simply supported beams under cyclic loading Load-deflection hysteresis relationship, load-slip hysteresis relationship of beam end and load-lateral deformation hysteretic curve of peg. The calculated results are in good agreement with the experimental results.