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http://dx.doi.org/10.12989/sem.2019.72.2.169

Wake-induced vibration of the hanger of a suspension bridge: Field measurements and theoretical modeling  

Li, Shouying (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University)
Deng, Yangchen (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University)
Lei, Xu (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University)
Wu, Teng (Department of Civil, Structural and Environmental Engineering, University at Buffalo)
Chen, Zhengqing (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University)
Publication Information
Structural Engineering and Mechanics / v.72, no.2, 2019 , pp. 169-180 More about this Journal
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 $4{\leq}X{\leq}10$ and $0{\leq}Y{\leq}4$ 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.
Keywords
hangers of suspension bridges; wake-induced vibration; field measurements; theoretical analyses; structural damping;
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