Abstract In recent years, high-mode vortex-induced vibration (VIV) of stay cables has been observed in some cable-stayed bridges. It can cause undue stress and fatigue in the anchorages at the deck and/or pylons and in the cables themselves. In this study, experimental investigations were performed to characterise and control the high-mode VIV of stay cables by using horizontal- and inclined-rigid-stay-cable models. First, wind tunnel tests using the horizontal-rigid-dimpled-stay-cable model were performed to investigate the VIV characteristics of dimpled stay cables and effective VIV suppression measures. Wind tunnel tests were then conducted on an inclined rigid dimpled cylinder with and without helical fillets to investigate further the VIV characteristics of dimpled stay cables and effective suppression measures. Finally, stay-cable field measurements were made for comparison with the experimental results of the stay-cable model. The results show that stay-cable VIV can occur in cases of low damping, and the VIV of the stay cable can be effectively suppressed by increasing the damping ratio of the stay cable. Moreover, helical fillets with a diameter of d = 2.0 or 3.5 mm, which are usually used to control rain–wind induced vibration of stay cables in cable-stayed bridges, cannot effectively suppress the high-mode VIV responses of stay cables. The inclined-dimpled-stay-cable model with a damping ratio of 0.2 % at inclination angles of 25° and 40° exhibits significant VIV for the cases of wind yaw angles of 0°, 15°, -15°, and -30°. However, helical fillets with d = 10 mm (d = 0.07D, where D is the diameter of the stay cable) and pitch of 12D can effectively suppress the VIV responses of the stay cables.

中文翻译：

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斜拉索高模涡激振动试验研究及气动对策

摘要 近年来，在一些斜拉桥中观察到斜拉索的高模涡激振动（VIV）。它会在甲板和/或塔架的锚固处以及电缆本身中引起过度的应力和疲劳。在这项研究中，通过使用水平和倾斜刚性斜拉索模型，进行了实验研究，以表征和控制斜拉索的高模 VIV。首先，使用水平-刚性-凹痕-斜拉索模型进行风洞试验，以研究凹痕斜拉索的VIV特性和有效的VIV抑制措施。然后在带有和不带有螺旋圆角的倾斜刚性凹坑圆柱体上进行风洞试验，以进一步研究凹坑斜拉索的 VIV 特性和有效的抑制措施。最后，进行了斜拉索现场测量，以与斜拉索模型的实验结果进行比较。结果表明，低阻尼情况下会出现斜拉索VIV，通过增加斜拉索阻尼比可以有效抑制斜拉索VIV。此外，通常用于控制斜拉桥斜拉索雨-风致振动的直径为d=2.0或3.5mm的螺旋圆角不能有效抑制斜拉索的高模振动响应。在倾角为 25° 和 40° 时阻尼比为 0.2% 的斜凹坑拉索模型在风偏角为 0°、15°、-15° 和 -30° 的情况下表现出显着的 VI . 然而，d = 10 mm (d = 0.07D,