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完成3个方钢管混凝土柱-组合梁空间节点模型的抗震性能试验,重点研究不同加载路径下空间组合节点的受力特征、滞回性能和破坏机理,比较平面加载组合节点和空间加载组合节点的受力特征,分析双向加载作用的耦合关系。结果表明,双向受力对钢管混凝土柱-组合梁节点的承载力、变形、延性以及刚度、强度退化等性能有较大影响;与平面内加载的组合节点相比,双向加载条件下空间组合节点的承载力最多可降低20%,延性降低10%;由于双向荷载的相关作用,梁变形在总变形中所占的比例有所降低,而柱变形及节点域剪切变形所占的比例增大,在节点核心区受剪设计时应考虑双向受力的不利影响。
The seismic performance tests of the three-dimensional square-column concrete-filled steel-concrete column-composite beam space node model are carried out. The stress characteristics, hysteretic behavior and failure mechanism of the space combination node under different loading paths are mainly studied. The comparison between plane load combination node and space load combination node Force characteristics, analysis of the coupling effect of two-way loading. The results show that the bi-directional stress has a significant effect on the bearing capacity, deformation, ductility and stiffness and strength degradation of the concrete-filled steel tubular column-composite beam joints. Comparing with the in-plane loaded composite joints, , The bearing capacity can be reduced by up to 20% at most and the ductility reduced by 10%. Due to the effect of the two-way load, the proportion of beam deformation in the total deformation decreases, while the proportion of column deformation and node shear deformation increases , In the core area of the node shear design should consider the adverse effects of two-way force.