The characteristics of wind- and rain-wind-induced vibrations of bridge stay cables are studied by using ambient vibrations records acquired on a cable-stayed bridge. Mean wind speed and wind-cable angle, as well as the occurrence of rainfalls, were investigated to diagnose a possible excitation mechanism promoting the onset of large heave amplitude oscillations, which were occasionally reported. Light rainfall, mean wind speed values between 8 ms${}^{-1}$ and 12 ms${}^{-1}$ and wind-cable angle ranging ${45}^{\circ }$ to ${65}^{\circ }$ were found to be critical conditions for the onset of large amplitude vibrations for the cases at hand. A single-mode response (eigenmode 3) associated with reduced velocities around 35 was generally activated during large cable oscillations (peak-to-peak amplitudes of twice the cable diameter) in wet conditions. The simultaneous video camera recordings also contributed to an improved understanding of the upper rainwater rivulet formation and the mechanism of stay cable vibrations in wet state.

利用在斜拉桥上获得的环境振动记录，研究了风阻和雨风引起的斜拉桥振动特性。研究了平均风速和风缆角度以及降雨的发生，以诊断可能引起大起伏振幅振荡发生的激发机制，但偶尔有报道。少雨，平均风速值在8毫秒之间${}^{-\mathrm{1个}}$ 和12毫秒${}^{-\mathrm{1个}}$ 和风缆角度范围 ${45}^{\circ }$ 至 ${\mathrm{65岁}}^{\circ }$被发现是在手情况下发生大振幅振动的关键条件。通常，在潮湿条件下，电缆发生较大振动（峰-峰振幅为电缆直径的两倍）时，会激活与35左右速度降低相关的单模响应（本征模式3）。摄像机同时录制也有助于更好地理解上部雨水小溪的形成以及在潮湿状态下拉索振动的机理。