双向隔震铁路桥梁与列车的耦合振动响应研究  

Investigation of the Coupling Dynamic Response between Bidirectional Seismic Isolated Railway Bridge and Train Load

作　　者：于芳[1] 周福霖[1,2,3] 苏键[2] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055 [2]湖南大学土木工程学院,湖南长沙410082 [3]广州大学工程抗震研究中心,广东广州510405

出　　处：《湖南大学学报（自然科学版）》2010年第6期17-21,45,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50608021);国家教育部博士点专项基金资助项目(20061078001)

摘　　要：为了研究铅芯橡胶双向隔震铁路桥梁在列车荷载作用下的动力性能,本文首先建立一座三跨隔震桥梁三维模型,然后对双向隔震铁路桥梁和列车组成的车桥系统耦合振动进行分析,研究其机理.结果表明,隔震桥梁在横桥向的隔震周期越大,桥梁梁体在列车荷载作用下横桥向位移越大,支座阻尼对桥梁梁体横桥向水平振动的衰减作用更加明显,对桥梁上部结构扭转角和竖向位移的影响可以忽略不计.桥梁横桥向的隔震周期的增大,使车体横摆、侧滚振动位移响应更加剧烈,对车体各个自由度的加速度响应影响可以忽略不计;隔震支座阻尼的增大对车体横摆、侧滚角、摇头角、沉浮和点头角位移响应以及对车体各自由度的加速度响应影响较小.In order to research the dynamic performance of a railway bridge with bidirectional lead rubber seismic isolation bearings under train load,a three spans bridge was established with ANSYS.The coupling vibration mechanism was studied between bridge and train.The results show that,the transverse displacement increases with the isolation period of transverse increase.The bearing damp attenuates the horizontal vibration and has little action on the tensional and vertical displacement.The transverse wiggle,side rolling and vertical displacement change little with the transverse seismic period increase.The bearing damping has little influence on the transverse wiggle,side rolling angle,shaking angle,up and down displacement,nodding angle displacement and acceleration response of each degree of freedom.

关 键 词：铅芯橡胶支座 双向隔震 铁路桥梁 车桥系统 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]