赫章特大桥动力特性及风致抖振响应分析

Analysis of Dynamic Characteristics and Wind-Induced Buffeting Response of Hezhang Bridge

赫章特大桥是一座超高墩的混凝土连续刚构桥,最高墩达到197m,为研究该桥的抗风能力,采用ANSYS10.0建立最大悬臂施工阶段和成桥阶段的有限元模型,并研究动力特性,采用修正傅里叶谱法生成脉动风速时程,基于准定常理论,计算作用在模型上的抖振力时程,由时程分析法分别计算最大悬臂阶段和成桥阶段抖振时域响应。

Hezhang Bridge is a rigid frame concrete bridge with high pier. Its highest pier is as high as 197 m. In order to study the wind-resistant capacity,the finite element models of the bridge both in the longest in cantilever construction stage and in the post construction stage are established respectively by using ANSYS10. 0. The dynamic characteristics of the bridge model are performed by subspace iteration method. The turbulent stochastic wind-velocity field of the bridge is simulated and checked by adopting the modified fourier spectrum method. Based the quasi-steady theory, the time history of buffeting force is computed. Finally, the results of the time-domain buffeting both in the longest in cantilever construction stage and in the post construction stage are computed respectively by carrying out time history analysis,