【摘要】 为揭示斜拉索风-雨致振动机理,利用三维绕流空间模型测试的气动力系数,提出了斜拉索风-雨致振动的修正驰振模型;将基于该模型的计算结果与风洞试验结果进行比较,以验证分析模型的有效性,并从能量的角度对斜拉索风-雨致振动的特性进行了探讨.研究表明:斜拉索风-雨致振动本质上是由升力系数负斜率引起的准驰振类型的限幅振动,具有自激和限幅振动双重特性.更多还原

【Abstract】 In order to explore the mechanism of rain-wind-induced vibration of cables,a modified model for rain-wind-induced vibration of cables was proposed based on aerodynamic coefficients tested by a spatial model with three-dimensional ambient flows.Furthermore,the feasibility of the modified model was verified through a comparison between analytical results and the ones obtained by wind tunnel tests.The characteristics of rain-wind-induced vibration were explored from the aspect of vibration energy.The research indicates that the rain-wind-induced vibration of cables is a type of galloping with a limited amplitude induced by negative slopes of aerodynamic lift coefficients and has the properties of self-excitation and limited amplitude vibrations.更多还原