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为了对桥梁结构的颤振稳定性能进行快速评价,基于频域分析法确定了三分力系数与颤振导数的关系,分析振动方程中的单元气动阻尼矩阵与气动刚度矩阵及弯扭耦合颤振驱动机理,将借助颤振导数研究颤振失稳问题转化为借助三分力系数研究颤振失稳。给出了基于三分力系数的颤振稳定性快速评价参数F。结合典型桥梁断面静力三分力与颤振稳定性风洞试验结果,验证了利用F参数快速评价桥梁断面颤振稳定性能的有效性。研究结果表明:通过建立三分力系数与颤振导数的联系,可以利用三分力系数快速评价桥梁结构颤振稳定性,颤振稳定性与升力系数C_L、阻力系数C-D、升力矩系数C_M绝对值负相关;|C_LC_M|越大,桥梁结构越容易发生颤振失稳;利用F参数快速评价颤振稳定性能方法可以快速对比不同方案的颤振稳定性,便于气动选型。
In order to evaluate the flutter stability of the bridge structure quickly, the relationship between the third component force and the flutter derivative was determined based on the frequency domain analysis. The aerodynamic damping matrix, the aerodynamic stiffness matrix and the torsional-torsional coupling flutter Driving mechanism, the flutter derivative will be used to study the problem of flutter instability with the help of the third component coefficient of flutter instability. A fast evaluation parameter F of flutter stability based on the third component force coefficient is given. Combined with the wind tunnel test results of static third component and flutter stability of the typical bridge section, the validity of using F parameter to verify the flutter stability of bridge section is verified. The results show that the flutter stability, the flutter stability and the lift coefficient C_L, the drag coefficient CD and the moment torque coefficient C_M absolute can be quickly evaluated by establishing the relationship between the third component force and the flutter derivative. The value of | C_LC_M | is larger, and the bridge structure is more prone to flutter instability. The fast evaluation of flutter stability by F-parameter method can quickly compare the flutter stability of different schemes and facilitate the aerodynamic selection.