结构关键参数对三塔悬索桥动力特性的影响  

Influences of Key Structural Parameters on Dynamic Characteristics of a Tripe-Tower Suspension Bridge

作　　者：王浩[1] 程怀宇[1] 陶天友[1] 邓稳平[1] 李爱群[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096

出　　处：《振动．测试与诊断》2014年第2期261-267,396,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51378111;51278104);教育部"新世纪优秀人才支持计划"资助项目(NCET-13-0128);江苏省交通科学研究计划资助项目(2011Y03);亚热带建筑科学国家重点实验室开放研究基金重点资助项目(2014KA04);中央高校基本科研业务费优秀青年教师专项资金资助项目(2242012R30002)

摘　　要：以世界第一大跨度三塔悬索桥——泰州长江公路大桥为研究对象,基于ANSYS建立了该桥的三维有限元模型,并采用子空间迭代法对其进行了模态分析,得到了该桥的相关动力特性参数并对其进行了分析。在此基础上根据该桥的结构型式和受力特点,重点研究了矢跨比、中塔刚度、中塔形式以及土-桩-结构作用等关键参数对结构动力特性的影响,深入分析了该桥动力特性随上述结构关键参数的变化趋势。结果表明,增大主缆矢跨比、提高中塔纵向刚度有利于改善大桥的颤振性能。所得结论可为大跨度三塔悬索桥的动力设计和研究工作提供参考。In this paper,the research object is the taizhou Yangtze River Highway Bridge,a triple-tower suspension bridge with the largest main span in this type.Firstly,a 3Dfinite element model for this bridge is established based on ANSYS software and its modal analysis is carried out through the subspace interaction method.The dynamic characteristics of this bridge are obtained and analyzed.Finally,the effects of the rise-span ratios,stiffness and configuration of middle tower,and the soil-pile-structure interaction on the dynamic characteristics of the triple-tower suspension bridge are investigated.The trend of the changes in dynamic characteristics with the above key parameters is analyzed.Results show that increasing the risespan ratios or the along-bridge stiffness of the middle tower can improve the bridge′s flutter performance. These results can provide references for the dynamic design and study of the triple-tower suspension bridge.

关 键 词：三塔悬索桥 动力特性 矢跨比 中塔刚度 中塔型式 土-桩-结构作用 

分 类 号：U442[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]