悬索桥颤振稳定性分析的精细时程积分法

研究精细时程积分法在悬索桥颤振稳定性分析中的应用,首先,将 气流整个作为一个系统,组集系统关于模态广义坐标的状态空间方程,然后,应用精细时程积分法计算状态的向量的时程响应,根据状态向量时程响应的对数衰减率判断系统的颤振稳定性,最后,以英国塞文悬索桥为数值算例,验证了本文方法的正确性。

Flutter stability analysis of suspension bridges by precise time-integration method

The application of the precise time-integration method in the flutter stability analysis of suspension bridges is studied. Firstly, the bridge structure is combined with wind as a whole system, and the system's state-space equation about the generalized coordinates of modes is assembled. Then, the time-history of the state-space vector is computed by the precise time-integration method. According to the logarithmic decrement of the time-history of the state-space vector, the stability of the system is estimate. Finally, the British Severn Bridge is analyzed to confirm the method.