低周反复荷载下弯剪破坏钢筋混凝土柱的变形性能  

Deformation performance of reinforced concrete columns failing in flexural-shear under cyclic loading

作　　者：张勤[1] 贡金鑫[1] 马颖[2] 

机构地区：[1]大连理工大学建设工程学部,大连116024 [2]华北水利水电大学水利学院,郑州450011

出　　处：《东南大学学报（自然科学版）》2014年第3期643-649,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51278081);国家自然科学基金重点资助项目(90815027)

摘　　要：为研究地震作用下弯剪破坏钢筋混凝土（RC）柱的变形性能，对24根不同剪跨比、轴压比及配箍率的RC柱进行了低周反复试验。分析了剪跨比、轴压比和配箍率对柱滞回曲线、骨架曲线及变形能力的影响，研究了RC柱的地震破坏模式以及不同破坏模式下柱的弯曲位移、剪切位移及滑移位移在总水平位移中所占比例和变化规律。结果表明，反复荷载下RC柱会发生弯曲、剪切及弯剪3种典型破坏。当剪跨比较小、轴压比较大且配箍率较小时，RC柱易发生弯剪破坏或剪切破坏，试件的耗能能力和延性较差，表现为滞回环面积和极限位移较小。当RC柱发生弯剪或剪切破坏时，弯曲位移在总水平位移中所占比例较小，剪切位移所占比例较大，钢筋拔出产生的滑移位移所占比例约为30％～40％。To investigate the deformation performance of reinforced concrete （RC）columns failing in flexural-shear failure under seismic loading,24 RC square columns with different axial load rati-os,aspect ratios and stirrup ratios were tested under cyclic horizontal loading.The influences of the axial load ratio,aspect ratio and stirrup ratio on the hysteresis loop,envelop curves and deformation capacity were analyzed.The failure modes and the ratios of the deformation components due to flex-ure,shear and anchorage slip to the total deformation of the RC columns in different failure modes were investigated.The results show that under the cyclic loading,the RC columns may exhibit flex-ure failure,shear failure and flexural-shear failure.The column with lower aspect ratio,higher axial load ratio and lower stirrup ratio may fail in brittle shear or flexural-shear,and the corresponding hysteretic energy dissipation capacity and ductility capacity are poor,which are characterized by smaller hysteresis loop area and ultimate displacement.For the column failed in flexural-shear or shear,the proportion of the flexure deformation component to the total deformation is small,while the proportion of the shear deformation component is relatively large.And the proportion of the an-chorage slip deformation component to the total deformation is about 30% to 40%.

关 键 词：钢筋混凝土 柱 低周反复试验 抗震性能 弯剪破坏 变形性能 

分 类 号：TU375.3[建筑科学—结构工程]