龙潭河大桥风致抖振时域分析

龙潭河大桥是一座最高墩高为179m，总长为812m的混凝土连续刚构桥，为高柔的风敏感结构。在分析抗风性能时，使用大型通用有限元软件ANSYS。建立了龙潭河大桥成桥阶段和最高墩施工最大双悬臂阶段的有限元模型，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了两阶段抖振时域分析的结果。分析结果为龙潭河大桥的抗风设计提供了依据。可供同类桥梁设计参考。

Time Domain Analysis of Wind-Induced Buffeting of Longtan River Bridge

Longtan River Bridge is a rigid frame concrete bridge with length 812 m.Its highest pier is as high as 179 m.The structure of the bridge is super flexible and wind-sensitive structure so that the analysis of wind-resistant capacity must be performed on the bridge.The finite element models of the bridge both in the post-construction stage and in the longest twin-cantilever construction stage are established respectively by using general finite element analysis(FEA) software ANSYS.The dynamic characteristic analysis of the two models is done.By introducing the Geodatis-innovated spectral representation method,the turbulent stochastic wind-velocity field of the bridge is simulated and checked.Then,the time history of buffeting force,which will be applied on both models,is computed according to the quasi-steady theory.Finally,the results of the time-domain buffeting analyses of the two stages are gotten by carrying out time history analysis.The wind-resistant design of the bridge can be based on that results.