中文摘要：

为研究外方内圆复合钢管高强混凝土柱的累积损伤性能，完成6个试件在轴压力作用下、同一水平位移往复加载10次的拟静力试验。试验主要变化参数为轴压比，方钢管壁板厚度及其宽厚比，圆钢管直径及厚度。试件的破坏形态基本相同，为柱底约300mm高度范围内方钢管外鼓屈曲，方、圆钢管之间混凝土局部压碎，圆钢管底部外鼓。破坏程度比往复加载3次的试件略为严重。试件的水平力-位移滞回曲线饱满；名义屈服时，试件的位移角为1／154～1／124；达到最大水平力时，试件的位移角大于1／80；试件的极限位移角大于1／60。与往复加载3次的复合柱试件的抗震性能基本相同，复合柱的抗震性能稳定。水平位移角为1／150及1／100时，试件基本无累积损伤；水平位移角为1／75、1／50及1／33时，试件有累积损伤，但不严重。增大方钢管壁厚或圆钢管壁厚，可以减小同一位移多次往复加载累积损伤引起的试件承载能力退化的幅度。

英文摘要：

Quasi-static tests on six specimens were conducted to investigate the cumulative damage performance of composite-sectioned high strength concrete-filled steel tubular （CSCFT） columns. The column specimen was subjected to axial compressive force and lateral reversal loading with ten cycles at each drift level. The test indexes include the axial force ratio, thickness of square steel tube and its width-to-thickness ratio, diameter and thickness of circular steel tube. The failure modes of the six CSCFT column specimens are almost same. Local buckling of square steel tube, crushing of concrete between the two steel tubes, and local buckling of circular steel tube were occurred within a height of 300ram from the column base. The damage extent of specimens was a little bit severe than the specimens loaded with three cycles at each drift ratio. The lateral force-displacement hysteretic loops of all specimens were plump. The nominal yield drift ratio was 1/154 to 1/124, the peak drift ratio was over 1/80, and the ultimate drift ratio was greater than 1/60. The seismic behavior of the specimens was about the same as that of the specimens loaded with three cycles at each drift ratio. It means that the seismic behavior of the CSCFT column is stable. At the drift ratios of 1/150 and 1/100, cumulative damage of the specimens was minimal. At the drift ratios of 1/75, 1/50 and 1/33, the specimens experienced cumulative damage to which the extent was not significantly severe. Increasing the thickness of square steel tube and the thickness of circular steel tube would lead to a reduction of degeneration extent of load-carrying capacity of specimens caused by cumulative damage.