风速变化对拉索风雨激振的影响

Influence of wind speed variation on rain-wind induced vibration of cables

斜拉索风雨激振受周边复杂的风雨环境影响,其中风速时刻变化,与以往研究中假定在某一工况下风速始终不变的情形有较大差异.通过采用基于悬链线静态线型的运动水线连续弹性拉索风雨激振理论模型及运动水线节段拉索风雨激振理论模型,研究了风速改变对拉索风雨激振的影响规律.研究结果表明:风速变化对拉索风雨激振振幅以及起振风速范围有较大影响,风速改变会使ψ值产生变化,ψ值变化决定着拉索振幅的变化规律.

The rain-wind induced vibration of cable is affected by the surrounding wind and rain environment. And the fact that the wind speed changes constantly is different from the assumption that the wind speed does not change in a certain condition in previous studies. Through establishing continuous elastic cable vibration theory model with moving rivulet based on catenary static linear motion and rigid segment cable vibration theory model with moving rivulet,the influence of wind speed changes on rain-wind induced vibration of cable was studied. The results show that the changes of wind speed has great influence on the amplitude of rain-wind induced vibration of cable and the range of rising wind speed,the wind speed change affects the psi value,and the change of the psi value determines the amplitude of cable.