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为了研究方钢管混凝土柱-钢梁外加强环节点的抗震性能,进行了四个方钢管混凝土柱-钢梁外加强环节点的低周反复荷载试验,以轴压比和梁柱线刚度比为参数,研究分析了该类节点的滞回曲线、延性、刚度退化、耗能能力及其破坏特征。结论表明:方钢管混凝土柱-钢梁外加强环节点滞回曲线饱满,耗能能力强,刚度退化缓慢,达到极限荷载后具有良好的延性和后期承载能力。经与钢筋混凝土框架、型钢混凝土框架及钢框架节点比较可知,方钢管混凝土柱-钢梁外加强环节点具有较好的受力性能和抗震能力,本文的研究成果可用于指导钢管混凝土结构的工程实践。
In order to study the seismic behavior of concrete-filled steel tube column-steel beam plus reinforced ring joints, low-cycle cyclic loading tests of four concrete-filled square steel tube columns and steel beams with reinforced ring joints were carried out. The axial compression ratio and beam- Parameters, the hysteresis curve, ductility, stiffness degradation, energy dissipation capacity and failure characteristics of such nodes are studied. The conclusion shows that the hysteretic curve of the square steel tube concrete column-steel beam plus reinforced ring joints is full, the energy dissipation capacity is strong, the rigidity degeneration is slow, and has good ductility and later bearing capacity after reaching the ultimate load. Compared with the reinforced concrete frame, steel reinforced concrete frame and steel frame node, we can see that the concrete-filled steel tubular column-steel girder with reinforced ring joints has better mechanical properties and anti-seismic capacity. The research results of this paper can be used to guide the concrete-filled steel tubular structures practice.