中空波纹夹层钢管混凝土柱抗震性能拟静力试验研究

Quasi-static experimental study on seismic performance of double-skinned composite tubular column with corrugated internal tube

为了研究中空波纹夹层钢管混凝土柱的抗震性能,以轴压比、空心率、长细比和截面形式为试验参数,开展了中空波纹夹层钢管混凝土柱的拟静力试验,分析了试件的破坏模式、承载能力、延性与耗能能力、刚度退化和强度退化等性能指标.结果表明:中空波纹夹层钢管混凝土柱的水平承载力较高,滞回曲线饱满,无明显捏缩现象,延性和耗能能力良好,同级循环荷载作用下性能稳定;试件的破坏模式为延性破坏,具体表现为柱底钢管鼓曲变形、混凝土压溃、局部缺陷处管壁撕裂;空心率较小的试件承载力较高,耗能能力较强;当长细比由20增至30时,试件位移延性系数降低了47.49%,承载力也明显下降;随着轴压比的增大,试件耗能能力逐渐降低.

To study the seismic performance of a double-skinned composite tubular column with corrugated internal tube(DSCTC),quasi-static tests were conducted on the specimens by taking the axial compression ratio,hollow ratio,slenderness ratio and section shape as the experimental parameters.The failure mode,bearing capacity,ductility and energy dissipation capacity,stiffness degradation and strength degradation of the specimens were analyzed.The results show that the DSCTC has a high lateral bearing capacity,a full hysteresis curve,no obvious pinch phenomenon,good ductility and energy dissipation capacity,and stable performance under the same level of cyclic loads.The failure mode of the specimens is ductile failure,which is manifested by bulging deformation of the steel tube at the bottom of the column,concrete crushing,and tearing of the tube wall at the local defects.The specimens with the smaller hollow ratio have higher bearing capacity and stronger energy dissipation capacity.When the slenderness ratio increases from 20 to 30,the displacement ductility coefficient of the specimens decreases by 47.49%,and the bearing capacity also decreases significantly.As the axial compression ratio increases,the energy dissipation performance of the specimens decreases.