考虑阻尼装置的斜拉索车致非线性振动分析  

Analysis on Nonlinear Vibration of Cables with Dampers Under Train Load

作　　者：刘桢杰 李小珍[2] LIU Zhenjie;LI Xiaozhen(Zhejiang Provincial Institute of Communication Planning,Design&Research,Hangzhou 310000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]浙江省交通规划设计研究院有限公司,杭州310000 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道建筑》2020年第11期7-11,共5页Railway Engineering

基　　金：国家自然科学基金(U1434205);国家重点基础研究发展计划(973)课题(2013CB036301)。

摘　　要：为探讨列车荷载激励下阻尼器阻尼参数对斜拉索振动特性的影响,以一座主跨600 m的铁路斜拉桥为工程背景,通过列车-线路-桥梁耦合动力仿真分析求解桥梁主体结构动力响应,并将其作为斜拉索端部激励,采用大刚度法求解单根斜拉索的局部振动响应。结果表明,阻尼系数、阻尼器安装位置对斜拉索局部振动响应有较大影响。阻尼系数取值过大对减振贡献小,但斜拉索自振频率提高更明显;阻尼系数存在最优取值范围,该范围内阻尼器的减振效果最佳,且有助于减小斜拉索局部振动响应的高频成分比例;阻尼器安装位置离斜拉索端部越远,斜拉索1阶最优模态阻尼比越大,其对应的阻尼系数越小;对频率分布较集中的1阶主共振斜拉索进行减振分析,阻尼系数可以参考斜拉索1阶模态阻尼比计算结果选取。In order to investigate the influence of damper damping parameters on the vibration characteristics of cables under train load excitation,taking a railway cable-stayed bridge with a main span of 600 m as the engineering background,the dynamic response of the main structure of the bridge was solved through the train-railway-bridge coupling dynamic simulation analysis,which was used as the end excitation of stay cables,and the large stiffness method was used to solve the local vibration response of a single cable.The results show that the damping coefficient and damper installation position have great influence on the local vibration response of cables.The larger the damping coefficient,the smaller the contribution to vibration reduction,but the increase of natural frequency of cable is more obvious.There is an optimal range of damping coefficient,in which the damping effect of damper is the best,and the more helpful to reduce the proportion of high frequency components of local vibration response of cable.The farther the damper is from the end of cable,the greater the first-order optimal modal damping ratio is,the smaller the damping coefficient is.For the vibration reduction analysis of the first-order main resonance cable with concentrated frequency distribution,the damping coefficient can refer to the calculation results of the first-order modal damping ratio.

关 键 词：铁路斜拉桥 阻尼装置 大刚度法 车致振动 局部振动 阻尼系数 阻尼器安装位置 

分 类 号：U24[交通运输工程—道路与铁道工程] TB123[理学—工程力学]