自锚式悬索桥加劲梁颤振特性的CFD研究

CFD-Based Study of the Flutter Characteristics of the Stiffening Girder of Self-Anchored Suspension Bridge

采用任意拉格朗日-欧拉描述法、二阶Projection格式和有限体积空间离散方法,求解运动刚性桥梁断面绕流场得到气动力,由CFD(Computational Fluid Dynamics)输入和输出通过系统识别得到颤振导数．应用该方法进行了长沙湘江三汊矶自锚式悬索桥加劲梁颤振导数的识别,得到的颤振导数与节段模型风洞试验结果的一致性,证明了本文方法的正确性．

Based on arbitrary Lagrangian-Eulerian description combined with a second-order Projection scheme and finite volume discretization, this paper presents a CFD method to evaluate the fluid field around the bridge deck to obtain aerodynamic forces, followed by identifying the flutter derivatives through system identification. The proposed method has been applied to identify the flutter derivatives of the stiffening girder of the Sanchaji Bridge. The flutter derivatives obtained are compared with those obtained from sectional model wind tunnel test, and reasonable agreements between them have proved the effectiveness of present method.