角钢连接的装配式混凝土梁柱节点塑性阶段力学性能研究

Study on mechanical properties of prefabricated concrete beam-column joints connected by angle steel in plastic stage

现有关于采用角钢和螺栓连接的干式拼装的装配式混凝土结构研究多集中在角钢的弹性阶段力学性能和节点的耗能能力上,而研究节点塑性阶段力学性能对研究其抗震性能也十分必要。采用试验和有限元模拟相结合的方法研究了角钢连接的装配式混凝土梁柱节点的塑性力学性能,通过1组试件的低周反复加载试验和60组试件的有限元模拟分析,得到了节点的荷载-位移滞回曲线。分析试验和有限元模拟结果,确定了弹性与塑性阶段的分界点,提出了塑性阶段等效转动刚度的表达式。研究结果表明,角钢采用双折线本构关系进行有限元模拟分析,其结果与试验结果吻合较好。

Most of the existing researches on dry assembling of the prefabricated concrete structure focused on energy dissipation capacity and mechanical properties of angle steel in elastic stage.It is necessary to study the mechanical properties of the joints in the plastic stage to study their seismic performance.The combination method of experiment and finite element simulation was used for studying the plastic mechanical properties in plastic stage of the prefabricated reinforced concrete beam-column joints with angle steel connection.The load-displacement hysteresis curves of the joins were obtained through a low reversed cyclic loading test on a specimen and a group of finite element simulation analysis on 60 specimens.The results of experiments and finite element simulations were analyzed, elastic and plastic stages determined in this paper and an expression for the equivalent rotational stiffness in the plastic stage was proposed.The research results showed that the finite element simulation analysis results of angle steel using the bifold line constitutive relation were in good agreement with the experimental results.