Wake galloping of staggered cables and its suppression measures

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (6) : 37-43.

CAI Chang1,2，HE Xuhui1,2，JING Haiquan1,2，QIN Chengwen3

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Abstract

The background of this study is a real cable-stayed bridge.A special support system was designed for wind tunnel tests.The effects of incidence angle and yaw angle on the wake induced vibration of two flexible staggered and unparalleled stay cables were investigated.Large wake galloping has been observed.The incidence angle and yaw angle of cables have significant impact on the amplitude and trajectory of the wake galloping.When the incidence angle equals 5° and the yaw angle equals 10°, the downstream cable is more prone to wake galloping.Therefore, this configuration is considered to be the most unfavorable case.Three suppression measures were applied to this unfavorable case.They are rigid connection rod, flexible connection rod, and additional damping.The results show that the rigid connection rod and the flexible connection rod successfully suppress the wake galloping of the downstream cable, while the effect of a little increase in additional damping is not apparent.

Key words

staggered cables / wind tunnel test / wake galloping / vibration suppressing measures

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CAI Chang1,2，HE Xuhui1,2，JING Haiquan1,2，QIN Chengwen3. Wake galloping of staggered cables and its suppression measures[J]. Journal of Vibration and Shock, 2020, 39(6): 37-43

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