外倾式双索面PC矮塔斜拉桥颤振稳定性分析  

Flutter Stability Analysis of Externally Inclined Double Cable Plane PC Low Tower Cable-Stayed Bridge

作　　者：李群锋 关伟 LI Qunfeng;GUAN Wei(Shanxi Transportation Planning Survey&Design Institute Co.,Ltd.,Taiyuan 030032,China)

机构地区：[1]山西省交通规划勘察设计院有限公司,山西太原030032

出　　处：《兰州工业学院学报》2024年第4期19-24,共6页Journal of Lanzhou Institute of Technology

基　　金：山西交通控股集团有限公司科技项目(20-JKKJ-38)。

摘　　要：基于浮山丞相河特大桥工程,对外倾式双索面PC矮塔斜拉桥主梁结构的颤振稳定性进行了分析。采用Midas Civil 2020有限元软件建立结构模型并分析结构动力特性,得到结构自振频率及振型,并分别对桥梁最大悬臂施工阶段和成桥阶段进行了颤振稳定性分析。通过新旧抗风规范对比分析,结果表明:该桥梁在2种工况下均具有较高的抗风稳定性,结构的颤振临界风速均远大于其颤振检验风速,结构安全,可供同类型桥梁在结构抗风设计时进行参考。Based on the Fushan Prime Minister River Bridge project,the flutter stability of the main beam structure of the externally inclined double cable plane PC low tower cable-stayed bridge is analyzed.Midas Civil 2020 finite element software is used to establish the structural model and the dynamic characteristics of the structure are analyzed.The natural frequency and mode of vibration of the structure are obtained,and flutter stability analysis is conducted under two working conditions:the maximum cantilever construction stage and the completion stage.Through comparative analysis of new and old wind resistance specifications,the results show that the bridge has high wind resistance stability under both operating conditions,and the critical flutter wind speed of the structure is much higher than its flutter inspection wind speed.The structure is safe and can be used as a reference for wind resistance design of similar bridges.

关 键 词：PC矮塔斜拉桥 外倾式双索面 动力特性 颤振稳定性 

分 类 号：U448.55[建筑科学—桥梁与隧道工程]