Buffeting Analysis of a Cable-Stayed Bridge Using Three-Dimensional Computational Fluid Dynamics
Buffeting Analysis of a Cable-Stayed Bridge Using Three-Dimensional Computational Fluid Dynamics
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DOI：
10.1061/(asce)be.1943-5592.0000618
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发表时间：
2014-04
影响因子：
3.6
通讯作者：
Byeong-Cheol Kim;Sung-soon Yhim
中科院分区：
文献类型：
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作者：
Byeong-Cheol Kim;Sung-soon Yhim
近年来，人们利用计算流体动力学（CFD）对桥梁的风致振动进行了大量的研究。以前的研究仅限于分析二维截面，尚未对整座桥梁进行三维（3D）分析。本文以一座斜拉桥为研究对象，开发了一个考虑流固耦合作用的计算流体动力学程序，对斜拉桥进行抖振分析。采用Galerkin最小二乘法和任意拉格朗日-欧拉方法建立有限元模型，进行流固耦合计算。采用谱表示法生成时间序列湍流，并将其应用于进口边界条件。一台超级计算机被用来减少大量的计算时间。本文利用一座既有斜拉桥的分析模型，计算了桥梁的动力响应和详细的风场。将桥梁的三维CFD分析结果与常规频域抖振分析结果进行了比较。计算结果与常规分析结果基本一致。在这项研究中开发的数值方法将是一个有效的替代风洞试验验证风流量，风荷载，和结构振动。
In recent years, a number of studies have been conducted to analyze wind-induced vibrations of a bridge using computational fluid dynamics (CFD). Previous studies have been limited to analyzing two-dimensional sections only, and three-dimensional (3D) analyses of entire bridges have not yet been performed. In this study, a CFD program with fluid-structure interaction is developed to perform buffeting analysis of a 3D cable-stayed bridge. The FEM formulated by the Galerkin least-squares method and arbitrary Lagrangian-Eulerian method are used to perform fluid-structure interaction CFD. The spectral representation method is used to generate the time series turbulence, which is applied to the inlet boundary condition. A supercomputer is used to reduce the large computing time. The analysis model of an existing cable-stayed bridge, which contains an ambient atmospheric region, has been used to calculate the dynamic responses of bridges and the detailed flow of wind. The results of the 3D CFD analysis of the bridge are compared with the results of conventional frequency domain buffeting analysis. The results are essentially in good agreement with those of the conventional analysis. The numerical method developed in this study will be an efficient alternative to wind tunnel tests for verifying wind flow, wind loading, and structural vibrations.