斜拉索局部振动对斜拉桥动力响应的影响分析  

Analysis of the effects of local cable vibration on dynamic response of the cable-stayed bridge

作　　者：梁栋 夏宏达 刘菁 Liang Dong;Xia Hong-da;Liu Jing(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《工程抗震与加固改造》2019年第1期96-103,10,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(50808063)

摘　　要：建立了由SHELL单元模拟密集拉索的斜拉桥有限元模型,以减少大量拉索振型的干扰,用以探讨斜拉索局部振动对斜拉桥动力特性的影响,从而可以对斜拉桥整体振动控制提供参考意见。分析结果表明:利用SHELL单元模拟密集拉索是可行的;斜拉索局部振动在一定程度上减小了斜拉桥振型频率;增大了主梁在地震作用下的弯矩峰值,同时也增大了桥塔在地震作用下的弯矩峰值和位移峰值。对于存在索-塔耦合振动的斜拉索,若拉索与桥塔连接位置更接近塔顶,那么它对桥塔动力响应的影响也就越大。In order to investigate the influence of local vibration of cable on dynamic characteristics of cable-stayed bridge and provide a reference for the overall vibration control of cable-stayed bridges, finite element model of cable-stayed bridge with dense cable simulated by SHELL unit is established to reduce the interference of large number of cable modes.The results show that:it’s feasible to simulate dense cables with SHELL elements;the local vibration of the stay-cables reduces the cable-stayed bridge modal frequency, and increases the peak bending moment of the main girder, in the same time increases the peak moment and displacement peak of the tower. For the cables with cable-tower coupling vibration, if the connection location between cable and bridge tower is closer to the top of the tower, it will have a greater impact on the dynamic response of the bridge tower.

关 键 词：斜拉索 地震响应 局部振动 索-塔耦合振动 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]