双肢薄壁大跨连续刚构桥抗震性能研究  

Study on seismic behavior of double thin-walled long-span continuous rgid frame bridge

作　　者：斯朗拥宗[1] 贾毅[2] 许智强[2] SILANG Yongzong;JIA Yi;XU Zhiqiang(Tibet University Institute of Technology,Lhasa 850000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西藏大学工学院,西藏拉萨850000 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《混凝土》2020年第9期41-45,共5页Concrete

基　　金：国家重点研发计划(2016YFC070045-01)。

摘　　要：为研究高烈度区双肢薄壁大跨连续刚构桥的抗震性能,以黄冈河大桥为工程背景,建立了考虑桩土共同作用的动力分析模型,应用反应谱法和非线性时程分析法研究桥梁下部结构在100年超越概率63%和50年超越概率2.5%两种地震水平下的响应,并结合桥墩截面的弯矩-曲率曲线对其进行抗震性能评估。分析结果表明:结构纵向刚度较小,纵向弯曲先于横向弯曲;主桥纵向振动与横向振动基本不耦合;非线性时程分析中双肢薄壁墩底弯矩比反应谱法计算结果增大4.64%、3.83%、4.42%、2.00%,墩顶位移减小34.8%;非线性时程分析考虑了摩擦摆支座的非线性,对于桥梁的抗震设计应以非线性时程分析结果为主;主桥在E1和E2地震作用下均处于弹性工作状态,满足结构抗震要求。For analyzing the seismic performance of double thin-walled long-span continuous rigid frame bridge in high intensity area,taking the Huanggang River Bridge as an example,the dynamic analysis model considering the interaction between pile and soil was established.The responses of the lower structure of the bridge under the 100-year transcendental probability of 63%and the 50-year overrun probability of 2.5%were studied by using response spectrum method and nonlinear time history analysis method.Besides,the seismic performance of the piers was evaluated by the bending moment-curvature curve.The results of the analysis demonstrate that the longitudinal stiffness of the structure is small,and the longitudinal bending is preceded by the transverse bending.The longitudinal vibration of the main bridge is basically not coupled with the lateral vibration.In the nonlinear time history analysis,the calculated results of the bending moment ratio of the double thin-wall pier are increased by 4.64%,3.83%,4.42%and 2.00%,and the displacement of the pier is reduced by 34.8%,and it is hence proposed that the results of the nonlinear time-history analysis should be taken as the seismic design.The main bridge is in the elastic working state under the action of E1 and E2,which satisfies the structural seismic fortification requirement.

关 键 词：桥梁工程 连续刚构桥 反应谱法 非线性时程分析法 弯矩-曲率分析 性能评估 

分 类 号：TU528.01[建筑科学—建筑技术科学]