桥梁颤振导数的耦合强迫振动仿真识别

Simulations for identification of flutter derivatives of bridge section using the coupled-forced-vibration method

提出了一种新的桥梁颤振导数识别方法——耦合强迫振动识别法,并采用CFD仿真桥梁节段模型的耦合强迫振动,通过数值计算节段模型上的颤振自激力,识别出节段模型的颤振导数。以丹麦的大带东桥为例,用仿真耦合强迫振动法识别了该桥梁节段模型的8个颤振导数,并计算了颤振临界风速,其计算结果与风洞试验结果一致,证明了所提出的耦合强迫振动识别法及数值仿真识别方法是可行的。

A new method, coupled-forced-vibration method, for the identification of flutter derivatives of 2-DOF section of bridge is developed in this paper. The dynamic mesh technology of CFD is used to simulate the coupled-forced vibration of the segmental model, and the flutter forces are identified through a calculation on its self-excited forces. Taking the segmental model of Great Belt Bridge as an example, via this method, eight flutter derivatives of the model are then obtained. The practicability of the method presented in this paper is proved through the consistency between the numerical results and the experimental results.