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以十字形截面钢管混凝土异形柱-钢梁框架中柱节点为研究对象,按1∶2比例设计了4个弱节点和强节点模型,通过施加恒定轴压比的竖向荷载和低周反复水平荷载,对节点模型进行了加载破坏试验。试验结果表明:弱节点试件破坏形态为节点核心区剪切破坏,随轴压比增大,试件受剪承载力提高,但其延性性能降低;强节点试件破坏形态为梁端受弯破坏,破坏前经历了较大的塑性变形,延性系数达到了5.65。由此可见,合理地设计钢管混凝土异形柱-钢梁框架中节点,可保证其延性破坏,实现“强柱弱梁,节点更强”的设计原则,满足抗震性能要求。
Taking the cross-section CFST special-shaped column-column joint of steel frame as the research object, four weak nodes and strong node models were designed according to the ratio of 1: 2. By applying the vertical load of constant axial compression ratio and the level of low- Load, the node model was loaded to destroy the test. The test results show that the failure mode of the weak joint specimen is the shear failure of the core region of the joint. As the axial compression ratio increases, the shear strength of the specimen increases, but the ductility of the specimen decreases. Damage, damage before undergoing a greater plastic deformation, ductility coefficient reached 5.65. Therefore, designing the joints of CFST special-shaped column-steel beam frame rationally can ensure the ductile failure and achieve the design principle of “strong column and weak beam with stronger joints” to meet the seismic performance requirements.