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龙潭河大桥是一座最高墩高为179 m,总长为812 m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AN SY S,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G eodatis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。
The Longtan River Bridge is a concrete continuous rigid frame bridge with the highest pier height of 179 m and the total length of 812 m. It is a high and soft wind-sensitive structure. When analyzing the wind resistance performance, large general finite element software AN SYS was used to establish The finite element model of the maximum double-cantilever phase in the bridge construction stage and the top pier construction of Longtanhe Bridge is analyzed. The dynamic characteristics of the model are analyzed. The stochastic pulsating wind speed field of the bridge is simulated and verified according to the improved G eodatis spectral representation. The quasi-constant theory is used to calculate the time-history of the buffeting force acting on the model. Finally, the results of two-stage buffeting time domain analysis are obtained respectively from the time history analysis. The analysis results provide a basis for wind-resistance design of Longtan River Bridge, which can be used as reference for similar bridge design.