大跨连续刚构桥双肢薄壁墩抗震性能研究  

Aseismic performance of double-limb thin-walled piers of a large-span continuous rigid frame bridge

作　　者：陈爱军[1] 彭容新 王解军[1] 贺国京[1] CHEN Aijun;PENG Rongxin;WANG Jiejun;HE Guojing(College of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学土木工程学院

出　　处：《振动与冲击》2020年第1期1-7,共7页Journal of Vibration and Shock

摘　　要：为获得双肢薄壁墩在地震作用下的破坏形态与力学性能,采用低周反复荷载试验探讨了不同轴压比、主筋率及体积配箍率对该类型桥墩抗震性能的影响,得到了各试验墩的破坏特性、滞回曲线、位移延性与耗能性能。试验结果表明:各试验墩的破坏形态基本相似,大体可分为三个阶段:弹性阶段、弹塑性阶段、弯曲破坏阶段。试验墩在墩底及系梁处破坏严重,其中墩底与墩顶出现显著的弯曲破坏,系梁处出现“X形”裂缝。主筋率较高的双肢薄壁墩滞回曲线较为饱满,耗能性能良好,适当提高轴压比可显著提高该桥墩的延性性能。各试验墩的变形能力较好,位移延性在2.63~3.68,变化幅度较大,主筋率对延性影响显著。In order to obtain failure form and mechanical performance of double-limb thin-walled piers under action of earthquake,effects of axial compression ratio,main reinforcement ratio and volume stirrup ratio on aseismic performance of this kind of piers were investigated with low cycle repeated load tests to obtain failure characteristics,hysteretic curves,displacement ductility and energy dissipation performance of all tested piers.The test results showed that failure modes of all tested piers are basically similar and they can be divided into three stages including elastic stage,elastic-plastic one and bending failure one;tested piers are seriously damaged at their bottoms and places connected with beams,significant bending failures appear at pier bottoms and tops;“X”shape cracks appear at places tied with beams;hysteretic curves of piers with higher main reinforcement ratio are fuller and their energy dissipation performance is good;proper increase in axial compression ratio can significantly improve ductility performance of tested piers;the deformation ability of each tested pier is better,displacement ductility of tested piers is within the range of 2.63-3.68 and has larger variation amplitude,main reinforcement ratio significantly affects ductility.

关 键 词：抗震性能 双肢薄壁墩 低周反复荷载试验 延性性能 轴压比 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]