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实际斜拉索的振动可能是风-雨致振动和参数振动的组合,索端激励对斜拉索风-雨致振动性能有一定影响。将索端激励转化为作用在斜拉索上的弹性力和惯性力,建立了斜拉索风-雨致振动和参数振动的组合分析模型,在讨论了参数振动模型和斜拉索风-雨致振动的特性后,探讨了索端激励对风-雨致振动振幅、水路运动以及达到最大振幅所需时间的影响。结果表明:在一定的频率范围内,索端激励的存在会改变斜拉索风-雨致振动幅值和水路运动幅值随时间变化的特性,并能促进斜拉索风-雨致振动的发生。
The actual cable vibration may be a combination of wind-rain-induced vibration and parametric vibration. The cable-end excitation has some influence on the wind-rain induced vibration performance of the cable. The cable end excitation is transformed into the elastic force and inertial force acting on the stay cable. The combined analysis model of the wind-rain induced vibration and the parametric vibration of the stay cable is established. After discussing the parametric vibration model and the inclined cable wind-rain After the vibrational characteristics were discussed, the effect of cable end excitation on the wind-rain-induced vibration amplitude, waterway motion and the time required to reach the maximum amplitude was discussed. The results show that the existence of cable end excitation changes the wind-rain-induced vibration amplitude and the water movement amplitude with time in a certain frequency range, and can promote the wind-rain-induced vibration of the stay cable occur.