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通过ABAQUS软件对15个T形钢管混凝土柱-混凝土梁外加强环板式节点抗震性能进行非线性分析。结果表明,节点模型均在核心区产生应力集中,不过参数的变化导致应力集中以及向四周扩散的程度有所差异。各节点模型的滞回曲线形状饱满,没有捏缩现象,滞回性能良好;位移延性系数均大于1.93,等效粘滞阻尼系数均大于0.180,能量耗散系数均大于1.134,这些抗震性能指标远远超过普通钢筋混凝土结构的要求,部分甚至超过型钢混凝土结构的要求。通过参数分析,了解节点抗震性能指标随参数的变化规律。框架梁配筋率增大不仅可以提高节点承载能力,而且对节点抗震性能提高也很有帮助;牛腿长度增大虽对节点承载力能力较为有利,但对抗震性能影响比较有限。
The seismic behavior of 15 T-shaped CFST-RC beams with strengthened ring-plate joints is analyzed nonlinearly by ABAQUS software. The results show that the node model has stress concentration in the core region, but the change of parameters leads to stress concentration and the degree of diffusion to the surroundings. The hysteresis curve of each node model is full and has no pinch-shrink phenomenon and good hysteretic performance. The displacement ductility coefficients are both greater than 1.93, the equivalent viscous damping coefficients are both greater than 0.180, and the energy dissipation coefficients are both greater than 1.134. These seismic performance indexes are far Far exceeding the requirements of ordinary reinforced concrete structures, some even exceeding the requirements of steel reinforced concrete structures. Through parametric analysis, we can know the change law of the seismic performance index of joints with parameters. The increase of the reinforcement ratio of frame beam can not only improve the bearing capacity of the node, but also improve the seismic performance of the node. Although the increase of the length of the cow leg is more favorable to the bearing capacity of the node, the impact on the seismic performance is relatively limited.