高烈度区系杆拱桥减隔震支座参数敏感性分析  

Sensitivity Analysis of Damping and Isolation Bearing Parameters for Tie-arch Bridges in High Intensity Zones

作　　者：罗建波 刘嘉兴 谢明志[2,3] 袁晶莲 LUO Jian-bo;LIU Jia-xing;XIE Ming-zhi;YUAN Jing-lian(Sichuan Tianshe Transportation Technology Co.Ltd.,Chengdu 610200,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]四川天设交通科技有限公司,成都市610200 [2]西南交通大学土木工程学院,成都市610031 [3]西南交通大学桥梁智能与绿色建造全国重点实验室,成都市611756

出　　处：《公路》2025年第4期78-85,共8页Highway

基　　金：国家自然科学基金项目,项目编号52322811;四川省科技计划资助项目,项目编号2020YJ0081。

摘　　要：为研究减隔震支座参数对高烈度区桥梁关键截面内力以及关键节点位移的影响规律,以主跨148m的金沙江系杆拱桥为工程背景,采用MIDAS建立全桥模型进行非线性时程分析,探究分别在摩擦摆支座和黏滞阻尼器单独作用下支座参数对桥梁响应的影响规律,并在此基础上将两类减隔震支座联合作用,进一步探明支座最优参数组合。结果表明,摩擦摆支座的摩擦系数增大会使弯矩与拱顶纵向位移增大,但相应轴力会有所减小;曲率半径增大会使各截面轴力增大,但同时弯矩有所降低;黏滞阻尼器的阻尼指数增大会使内力和拱顶位移减小,阻尼系数增大会使内力和拱顶位移增大;联合作用下各截面内力均稳定且均匀,与单独作用相比,能在降低桥梁内力响应的同时避免单独使用摩擦摆时位移过大的问题,能更好地发挥两类支座的优势。In order to study the influence of vibration isolation bearing parameters on the key crosssection internal force and the displacement of key nodes of bridges in the high intensity zone,the Jinsha River tied arch bridge with a main span of 148 m is taken as the engineering background,and MIDAS is used to establish the whole bridge model and carry out the nonlinear time analysis to investigate the influence of the bearing parameter degree on the response of the bridge under the action of friction pendulum and viscous damper alone,and on the basis of which the joint action of two types of vibration isolation bearings is used to further identify the optimal combination of the bearing parameters.On this basis,the two types of vibration isolation bearings are combined to further investigate the optimal parameter combination of the bearings.The results show that:the increase of friction coefficient of friction pendulum bearing will increase the bending moment and longitudinal displacement of the arch,but the corresponding axial force will be reduced;the increase of radius of curvature will increase the axial force of each cross-section,but at the same time,the bending moment will be reduced;the increase of damping index of viscous damper will reduce the internal force and arch displacement,and the increase of damping coefficient will increase the internal force and arch displacement;under the joint action of the various crosssections of the internal force is stable and uniform,compared with the separate action,it can reduce the internal force of the bridge in a more favorable way.Compared with the separate action,it can reduce the internal force response of the bridge while avoiding the problem of excessive displacement when the friction pendulum is used alone,and can better utilize the advantages of the two types of bearings.

关 键 词：桥梁工程 系杆拱桥 高烈度区 摩擦摆支座 黏滞阻尼器 

分 类 号：U443.36[建筑科学—桥梁与隧道工程]