某V形刚构连续梁拱组合桥隔震性能有限元分析  

Finite Element Analysis of Isolation Performance of a Hybrid SystemBridge of V-typeRigid-frame Continuous Girder and Arches

作　　者：张耀万 ZHANG Yao-wan(Lanzhou Railway Survey and Design Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州铁道设计院有限公司,甘肃兰州730000

出　　处：《兰州工业学院学报》2021年第3期25-30,共6页Journal of Lanzhou Institute of Technology

摘　　要：为研究大矢跨比连续梁拱组合桥的地震响应及隔震特性,以某V形刚构连续梁组合拱桥为工程背景,采用不同地震输入组合对该桥进行地震响应分析,并引入TFPS隔振系统分析其在三向地震输入模式下的隔震性能;建立全桥有限元模型,利用时程分析法对比分析该结构在不同地震输入模式下的地震响应及设置TFPS隔震支座后的抗震性能.结果表明:不考虑三向地震同时输入会明显低估连续梁拱组合桥的地震响应;在V形刚构制动墩底设置TFPS隔振系统,通过适度削减制动墩与主梁的约束,降低了作用于制动墩上的主梁与主拱质量,使各墩协同受力,从而减小制动墩上的地震响应.In order to study the seismic response and isolation characteristics of long-span ratio continuous beam-arch composite bridge,a hybrid system bridge of V-type rigid-frame continuous girder and arches on the railway line is taken as the engineering background.The seismic response of the bridge is studied by using different seis-mic input combinations,and the isolation performance of the bridge under the three-direction seismic input mode is analyzed by introducing the TFPS isolation system.The finite element model of the whole bridge is established,and the seismic response of the structure under different earthquake input modes and the seismic behavior of the structure with TFPS isolation support are compared with time history analysis method.The results show that the seismic response of continuous beam-arch composite bridge is obviously underestimated without considering the three-direction earthquake simultaneously,and the TFPS vibration isolation system reduces the mass of the main beam and arch acting on the brake pier by reducing the restraint between the brake pier and the main beam.In order to reduce the seismic response on the brake pier,the force of each pier is coordinated.

关 键 词：连续梁拱组合桥 TFPS支座 地震动输入模式 隔震性能 有限元法 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]