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Structural Engineering and Mechanics Volume 72, Number 2, October25 2019 , pages 169-180 DOI: https://doi.org/10.12989/sem.2019.72.2.169 |
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Wake-induced vibration of the hanger of a suspension bridge: Field measurements and theoretical modeling |
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Shouying Li, Yangchen Deng, Xu Lei, Teng Wu and Zhengqing Chen
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| Abstract | ||
| The underlying mechanism of the wind-induced vibration of the hangers of the suspension bridges is still not fully understood at present and hence is comprehensively examined in this study. More specifically, a series of field measurements on the No. 2 hanger of the Xihoumen Bridge was first carefully conducted. Large amplitude vibrations of the hanger were found and the oscillation amplitude of the leeward cable was obviously larger than that of the windward cables. Furthermore, the trajectory of the leeward cable was close to an ellipse, which agreed well with the major characteristics of wake-induced vibration. Then, a theoretical model for the wake-induced vibration based on a 3-D continuous cable was established. To obtain the responses of the leeward cable, the finite difference method (FDM) was adopted to numerically solve the established motion equation. Finally, numerical simulations by using the structural parameters of the No. 2 hanger of the Xihoumen Bridge were carried out within the spatial range of 4 4<=X<=10 and 0<=Y<=4 with a uniform interval of delta X= delta Y=0.25. The results obtained from numerical simulations agreed well with the main features obtained from the field observations on the Xihoumen Bridge. This observation indicates that the wake-induced vibration might be one of the reasons for the hanger oscillation of the suspension bridge. In addition, the effects of damping ratio and windward cable movement on the wake-induced vibration of the leeward cable were numerically investigated. | ||
| Key Words | ||
| hangers of suspension bridges, wake-induced vibration, field measurements, theoretical analyses, structural damping | ||
| Address | ||
| Shouying Li/Hunan University Yangchen Deng/Hunan University Xu Lei/Hunan University Teng Wu/University at Buffalo Zheng Qing Chen/Hunan University | ||