悬索桥的风致振动分析

系统分析悬索桥的颤振稳定性，抖振响应和涡激共振，以Ｓｃａｎｌａｎ Ｒ Ｈ提出的分离流三维颤抖振理论和半经验非线性涡激力假设为基础，分别用频域和时域方法，建立气动弹性模型。频域中用Ｖ－ｇ法和统计方法求解颤抖振。时域中用根轨迹法确定颤振，用求解Ｌｙａｐｕｎｏｖ矩阵方程的方法确定抖振响应，通过对实际悬索桥的分析，两种方法得到了比较一致的结果。

ANALYSIS OF WIND INDUCED VIBRATION OF SUSPENSION BRIDGE

The wind induced vibrations such as flutter,buffeting and vortex induced response of suspension bridge were studied in a systematic way. Based on the 3 Dimensional flutter and buffeting analysis theory and the semi experience,nonlinear vortex induced excited force suposition,which were proposed by Scanlan R.H.,two aeroelastical models were seperately established in frequency domain and time domain.In frequency domain,flutter and buffeting response were solved by using V g method and statistical approach. In time domain,root locus method was developed for solving flutter,and the buffeting response was obtained by solving Lyapunov equation.Appling the above analytical method to a real suspension bridge,it shows that the results of flutter and buffeting of both domains are consistent.