矩形钢管约束钢筋混凝土超短柱滞回性能试验

Experiment on the rectangular tubed RC ultra short columns under axial compression and lateral cyclic load

为研究矩形钢管约束钢筋混凝土超短柱的滞回性能,进行了4个矩形钢管约束钢筋混凝土超短柱和2个普通钢筋混凝土对比试件的试验研究.主要参数为轴压比(0.3,0.5)和钢管宽厚比(111,166);6个试件的剪跨比均为1.0.试验结果表明:普通钢筋混凝土超短柱的破坏模式为剪切破坏,延性和耗能性能较差;钢管约束钢筋混凝土超短柱中,钢管对混凝土产生有效约束作用,因此构件未发生剪切破坏,延性、弹塑性变形能力和耗能性能显著高于钢筋混凝土对比试件;随轴压比提高,矩形钢管约束钢筋混凝土超短柱的承载力提高,但延性稍有降低.在本文试验研究范围内,钢管的宽厚比对矩形钢管约束混凝土超短柱的抗震性能无显著影响.

To study the seismic behavior of RCRC ultra short columns,the tests subjected to combined con-stant axial compression and cyclic lateral shear force of rectangular tubed RC（RTRC）columns including 4 RCRC and 2 common RC columns for comparison were carried out.The main parameters were axial load ratio（0.3 and 0.5）and width to thickness ratio（111 and 166）,and the shear span to depth ratio of all the tested columns was 1.0.The results indicated that the failure mode of common RC short columns was shear failure,therefore the RC columns showed little ductility and energy dissipating capacity.Under lateral shear force,RCRC short columns showed no shear failure due to the effective confinement from the outer tube to the core concrete.The RTRC columns showed higher ductility,elastic-plastic deformation capacity and energy dissipa-ting capacity than the common RC columns.The lateral load strength of RCRC short columns increased with the increment in axial load ratio,while the ductility decreased a little,and the width to thickness ratio affected little on the seismic behavior of RTRC ultra short columns.