中文摘要：

针对目前改变斜拉索表面形状来抑制斜拉索由风载荷引起的振动所遇到的问题,采用热线风速仪、激光位移器测量和烟线等实验方法,实验研究在Re =6 800～20 480 区域内波浪型斜拉索涡致耦合振动及频率“锁定”现象,并引入直斜拉索作为对比.实验表明：在相同的质量比和阻尼比下,波浪型斜拉索λ/D =2 和λ/D =6 同直斜拉索同样容易被诱导振动,波浪型λ/D =2 比波浪型λ/D =6 的减震效果要好,和直斜拉索相比,波浪型λ/D =2 的诱导振动时最大振幅减小10 %,锁定区间变短,主要是由于随着表面凹凸变化倾斜度较大,波浪型斜拉索表面的展向二次涡强度得以增强,一旦诱导振动,将干扰斜拉索的涡旋激励,从而达到减震的目的.

英文摘要：

Considering the existing challenges in wind-induced vibration control of flexible stay-cables, a new modified wavy stay-cable was proposed to suppress the vibration and reduce the cable drag. By using hot-wire anemometer, laser displacement sensor, pressure scanning valve, smoke wire and some other experimental methods, the vortex-induced vibration (VIV) and the frequency lock-in phenomenon of the wavy stay cables at Re=6800-20480 were studied. The results were compared with those of the regular stay cable. The experimental results indicated that similar to the straight stay cable, the wavy stay cable with λ/D=2 and λ/D=6 can be induced the vibration easily at the same mass ratio and damping ratio. However, the vibration suppression effect of the wavy stay cables still exists. The vibration suppression effect of the wavy stay cable withλ/D=2 is better than that of the wavy stay cable with λ/D=6 . Compared with the straight stay cable, the maximum amplitude of the vortex-induced vibration can be reduced by 10%for the wavy-stay-cable, and the lock-in region is shortened. One of the main reasons is that the large variation of the modified wavy stay-cable surface can enhance the secondary spanwise vortex. Once the vortex vibration is induced, the large variation of the modified wavy stay-cable surface will interfere the vortex excitation so that the vortex shedding is controlled and the lift fluctuation is suppressed.