摘要
四渡河特大桥是一座山区大跨悬索桥,为高柔的风敏感结构。在分析抗风性能时,采用大型通用有限元软件ANSYS,建立了四渡河悬索桥的三维有限元模型,分析了模型的动力特性,根据Geodatis改进型的谱表示法模拟了桥梁的随机脉动风速场并进行了检验,然后基于准定常理论计算了作用在模型上的抖振力时程,最后由时程分析分别求得抖振时域分析的结果。分析结果为四渡河悬索桥的抗风设计提供了依据,可供同类桥梁设计参考。
Sidu River Bridge is a montane long-span suspension bridge.The structure of the bridge is super flexible and wind sensitive,so the wind-resistant capacity must be examined for the bridge.The 3D finite element model of the bridge was established by using general finite element analysis （FEA） software ANSYS,and its dynamic characteristics were obtained.By introducing the modified Geodatis spectral representation method,the turbulent stochastic wind-velocity field of the bridge was simulated and checked.Then,the time-history of buffeting force was calculated according to the quasi-steady theory.Finally,the results of the time domain buffeting analyses were obtained by conducting time history analysis.This study can provide reference for the wind-resistant design of similar bridges.
出处
《工程力学》
EI
CSCD
北大核心
2010年第A01期113-117,共5页
Engineering Mechanics
基金
湖北省自然科学基金项目(2009CDB418)
国家自然科学基金项目(50878093)
交通部西部交通建设科研项目(200431800024)
关键词
大跨悬索桥
风场模拟
动力特性
抖振
时域分析
long span suspension bridge
wind field simulation
dynamic characteristic
buffeting
time domain analysis
