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| A study on wind-induced vibration characteristics of stay cables under surface-damaged state |
| LIU Qingkuan1,2，SUN Yifei3，JIA Yaya1,2，ZHANG Leijie3，MA Wenyong1,2，LIU Xiaobing1,2 |
| 1.Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2.Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China;
3.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China |
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Abstract During production, transportation, installation and operation, stay cables may surfer scratches and cracks.Studying wind-induced vibration characteristics of stay cables under surface damage is of great significance for accurately evaluating the aerodynamic stability of stay cables during their service life.Through wind tunnel tests of a smooth model and other models with 2 sizes of dent, the influences on wind-induced vibration characteristics of Reynolds number, wind direction and the size of dents were studied.And the vibration state was initially judged.Results show that the vibration characteristics with Reynolds number curve of the dent cable model is similar to that of the smooth model, but the maximum amplitudes of the dent cable model are larger than that of the smooth model in the worst wind directions.At the same wind direction, there are lower starting Reynolds number and wider Reynolds number interval of wind-induced vibration of dent models.Also, the size of dent influences wind-induced vibration characteristics prominently during test Reynolds number range, not a simple monotonous relation, but related to wind direction closely.This wind-induced vibration is initially judged to be galloping, not vortex-induced vibration, based on vibration frequency and Den Hartog criterion.
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Received: 25 September 2018
Published: 15 April 2020
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