中文摘要：

该文以轴压比、含钢率和长细比为参数,进行了8根方钢管高强混凝土柱的低周反复荷载试验,研究分析了该类构件的滞回曲线、延性、刚度退化、耗能能力、破坏机理和特征;考察了轴压比、含钢率和长细比对试件受力性能及抗震性能的影响规律。研究表明,方钢管高强混凝土柱滞回曲线饱满,耗能能力强,达到极限荷载后具有良好的延性和较为稳定的后期承载能力,位移延性系数在3.05―4.07之间,满足延性构件的要求。柱轴压比对试件的承载力和抗震性能的影响最大,随着轴压比的增加,试件的承载力降低,位移延性减小,耗能能力降低,刚度退化的速度加快;随着含钢率的增加,试件的弹性阶段刚度和承载力提高,位移延性增加,耗能能力提高;随着长细比的增加,试件的承载力和弹性阶段刚度都明显降低。经与钢筋混凝土柱、型钢柱的对比分析可知,方钢管高强混凝土柱在受力、施工和经济性能等方面明显优于其他结构,有进一步研究和推广应用的价值。

英文摘要：

Through the low cyclic load test of eight high strength concrete-filled square steel tubular columns,considering the effect of the axial compression ratio,steel ratio and slenderness ratio,the hysteretic curve,ductility,degradation of stiffness,energy dissipation capacity,failure mechanism and characteristics of the specimens were researched.The influence law of the axial compression ratio,steel ratio and slenderness ratio on the mechanical and seismic behavior of these columns were analyzed.The results indicate that the high concrete-filled square steel tubular columns have plump hysteretic loops,stronger energy dissipation capacity,and good ductility after the specimens reach ultimate loads,that the displacement ductility coefficient is between 3.05 and 4.07,and that the columns can meet the requirement of ductile specimens.The axial compression ratio has larger influence on the load-carrying capacity and the seismic behavior,with the increment of the axial compression ratio,the load-carrying capacity decreases,the displacement ductility and energy dissipation capacity reduces,and the stiffness degradation is faster;with the increment of steel ratio,the load-carrying capacity and elastic stage stiffness increase,and the displacement ductility and energy dissipation capacity increase;with the increment of the slenderness ratio,the load-carrying capacity and elastic stage stiffness reduce obviously.