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通过3个全矩形钢管混凝土框架节点(外加强环)模型的拟静力试验,以轴压比和梁柱线刚度比为参数,研究了该类框架节点的滞回曲线、延性、强度与刚度退化、耗能能力、破坏机理及其破坏特征,考察了轴压比、梁柱线刚度比等参数对节点受力性能的影响规律。结论表明:全矩形钢管混凝土框架节点的滞回曲线饱满,耗能能力强;强度与刚度退化缓慢;在达到极限荷载后具有良好的延性和后期变形能力,满足延性节点的要求。经与钢筋混凝土框架、组合结构框架及钢框架节点抗震性能的比较可知,全钢管混凝土框架节点具有较好的受力性能和抗震能力,研究成果可用于指导钢管混凝土结构的工程实践。
Through the quasi-static tests of three full-rectangular CFST (externally-reinforced ring) model, the hysteresis curves, ductility, strength and stiffness of the joints were studied with the axial compression ratio and beam-column stiffness ratio as parameters Degradation, energy dissipation, failure mechanism and failure characteristics of the joints were investigated. The effects of axial compression ratio, stiffness ratio of beam and column on the mechanical behavior of joints were investigated. The results show that the hysteretic curves of full-rectangular CFST joints are full, and their energy dissipation capacity is strong. The strength and stiffness degenerate slowly. After reaching the ultimate load, they have good ductility and post-deformation capacity, meeting the requirements of ductile joints. Compared with the seismic performance of reinforced concrete frame, composite structural frame and steel frame joints, the concrete filled steel tubular frame joints have better mechanical properties and seismic resistance. The research results can be used to guide the engineering practice of CFST structure.