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为研究带楼板的外加强环式方钢管混凝土柱(CFSST)节点的弹塑性力学性能,以方钢管混凝土柱节点试验尺寸为参照,在总结相关文献试验结果的基础上,选取钢材和混凝土的本构关系模型,定义混凝土损伤塑性因子,以及混凝土压缩复原和拉伸恢复系数,对外加强环式方钢管混凝土柱节点进行单向加载及循环往复加载下的全过程力学分析,绘制荷载-位移曲线;同时对外加强环式节点进行参数分析,研究宽厚比、轴压比、混凝土楼板高度及核心混凝土强度对节点受力性能的影响。研究结果表明:相比混凝土楼板高度和核心混凝土强度,轴压比、宽厚比对此类节点的受力性能影响较大。
In order to study the elasto-plastic mechanical properties of concrete-filled CFST columns (CFSST) with floor slab, taking the test dimensions of concrete-filled square steel tubular columns as references and based on the results of relevant literature tests, The plasticity factor of concrete structure, the plasticity factor of concrete damage and the coefficient of compressive recovery and tensile recovery of concrete are defined. The whole process mechanical analysis of unidirectional loading and cyclic loading of externally reinforced circular CFST columns is performed to draw the load-displacement curve. At the same time, the parameters of the externally-reinforced ring node are analyzed, and the effects of aspect ratio, axial compression ratio, concrete floor height and core concrete strength on the stress behavior of the joint are studied. The results show that, compared with the concrete floor height and the strength of core concrete, the axial compression ratio and the aspect ratio have a significant influence on the mechanical properties of such joints.