边墩约束对塔梁墩固结体系斜拉桥横桥向减震影响研究  

Research on Effect of Side-Pier Restraint on Transverse Seismicity of Cable-Stayed Bridge with a Pylon-Girder-Pier Fixity System

作　　者：万沐聪 宋随弟[1] 申庆灿 WAN Mucong;SONG Suidi;SHEN Qingcan(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《桥梁建设》2024年第4期106-111,共6页Bridge Construction

摘　　要：为了解塔梁墩固结体系斜拉桥的横桥向地震响应并选取合理的抗震结构体系,以主跨305 m的湖南帅乡特大桥为背景,采用MIDAS Civil软件建立不同边墩约束方案(7种常规支座边墩约束方案、1种摩擦摆球型支座边墩约束方案)的桥梁三维有限元模型,分析不同边墩约束条件对塔梁墩固结体系斜拉桥塔底横桥向弯矩及主梁梁端横桥向位移的影响。结果表明:相较于采用常规支座边墩约束方案,采用摩擦摆球型支座边墩约束方案不仅可以减小塔梁墩固结体系斜拉桥在地震作用下的塔底横桥向弯矩,还可以将主梁梁端横桥向位移控制在较小的数值内,显著提高了塔梁墩固结体系斜拉桥横桥向抗震性能;E2地震作用下,地震引起的结构响应普遍比静力计算结果小,主墩、桥塔及边墩均处于弹性状态,抗震不控制设计。湖南帅乡特大桥最终采用设置摩擦摆球型支座的边墩约束方案。This study investigates the transverse seismic performance of the cable-stayed bridge with a pylon-girder-pier fixity system and the selection of rational seismic mitigation system.The Shuaixiang Bridge in Hunan Province with a main span of 305 m is used as a case.Eight different types of side-pier restraint schemes were modelled in MIDAS Civil,including seven conventional bearing restraints and one friction pendulum spherical bearing restraint,to analyze the effects of different types of side-pier restraints on the transverse bending moments in pylon bottom and transverse displacements at main girder ends in the cable-stayed bridge with a pylon-girder-pier fixity system.It is shown that compared with the conventional side-pier restraints,the friction pendulum spherical bearing restraint can not only mitigate the pylon-bottom transverse bending moments of the pylon-girder-pier fixity system during a seismic event,but also control the girder-end transverse displacement within relatively smaller ranges,significantly improving the transverse seismic performance of the cable-stayed bridge with a pylon-girder-pier fixity system.Under E2 earthquakes,the structural responses are smaller than static calculation.The main piers,pylons and side piers are all at elastic stages,indicating that the seismicity does not control the design.The friction pendulum spherical bearings were finally selected as the side-pier restraint scheme.

关 键 词：斜拉桥 塔梁墩固结体系 边墩约束方案 摩擦摆球型支座 横桥向减震设计 有限元法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]