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
李群锋 1关伟1
作者信息
- 1. 山西省交通规划勘察设计院有限公司,山西 太原 030032
- 折叠
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.
Abstract
Based on the Fushan Prime Minister River Bridge project,the flutter stability of the main beam struc-ture 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 analy-sis 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 struc-ture 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Key words
PC low tower cable-stayed bridge/external inclined double cable surface/dynamic characteristics/flutter stability引用本文复制引用
基金项目
山西交通控股集团有限公司科技项目(20-JKKJ-38)
出版年
2024
NETL
NSTL
万方数据