方钢管混凝土柱内隔板贯通式节点核心区抗震性能的试验研究

Experimental study of connections of concrete-filled square steel tubular columns with continuous diaphragms

方钢管混凝土柱在建筑结构中已经得到越来越广泛的应用。为研究方钢管混凝土柱与钢-混凝土组合梁(钢梁)连接的内隔板贯通式节点的抗震性能,对10个节点试件进行低周反复荷载试验。在此基础上,对其核心区受力过程、破坏形态、滞回曲线、骨架曲线、延性、刚度退化、强度退化和耗能能力等抗震性能进行较为深入的研究与分析。研究结果表明:节点试件的滞回曲线呈明显的梭形,且非常丰满,耗能能力强;内隔板贯通式节点具有较好的延性和承载力,即使在发生节点破坏的时候,也为延性破坏;节点在整个加载过程中刚度退化明显,强度退化很小,可以在抗震设防地区推广使用。

Concrete-filled square steel tubular columns are more and more widely used in buildings. Ten joints specimens were tested under cyclic loads to investigate the seismic behavior of composite connections with diaphragms. Based on the experiments, the failure pattern, hysteresis curve, skeleton curve, rigidity d strength continuous egradation, degradation and energy dissipation capacity, etc. , were studied. The results showed that the energy dissipation capacity, strength and ductility of the connections with continuous diaphragms were sufficient and the hysteretic characteristics stable. Even if the connection fails, it should be in ductile mode. The seismic performance of the connection is adequate to be applied in seismic areas.