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 vibration of actual cables may be the combination of a wind-rain-induced vibration(WRIV) and a parametric vibration.The excitation at cable ends can change the characteristics of WRIV of stayed cables.Considered the effects of an excitation at cable ends,an integrated analytical model including a WRIV and a parametric vibration is developed.In this model,the excitations are transformed into an elastic force and an inertia force which are acted on cable firstly.Then the characteristics of the parametric vibration model and WRIV model are analyzed.And the amplitude,rivulet of motion and the time arrived largest amplitude are investigated to demonstrate the effects of the excitation at cable ends.It shows that the excitation within a range of frequencies at cable ends change the amplitude of WRIV and the time-changing characteristics of rivulet motion,and promote the occurrence of a WRIV.