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Smart Structures and Systems Volume 22, Number 6, December 2018 , pages 727-741 DOI: https://doi.org/10.12989/sss.2018.22.6.727 |
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Mitigation of wind-induced vibrations of bridge hangers using tuned mass dampers with eddy current damping |
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Huawei Niu, Zhengqing Chen, Xugang Hua and Wei Zhang
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| Abstract | ||
| To mitigate vibrations, tuned mass dampers (TMD) are widely used for long span bridges or high-rise buildings. Due to some durability concerns, such as fluid degradation, oil leakage, etc., the alternative solutions, such as the non-contacted eddy current damping (ECD), are proposed for mechanical devices in small scales. In the present study, a new eddy current damping TMD (ECD-TMD) is proposed and developed for large scale civil infrastructure applications. Starting from parametric study on finite element analysis of the ECD-TMD, the new design is enhanced via using the permanent magnets to eliminate the power need and a combination of a copper plate and a steel plate to improve the energy dissipation efficiency. Additional special design includes installation of two permanent magnets at the same side above the copper plate to easily adjust the gap as well as the damping. In a case study, the proposed ECD-TMD is demonstrated in the application of a steel arch bridge to mitigate the wind-induced vibrations of the flexible hangers. After a brief introduction of the configuration and the installation process for the damper, the mitigation effects are measured for the ambient vibration and forced vibration scenarios. The results show that the damping ratios increase to 3% for the weak axis after the installation of the ECD-TMDs and the maximum vibration amplitudes can be reduced by 60%. | ||
| Key Words | ||
| eddy current damping tuned mass damper (ECD-TMD); arch bridges; hanger; tuned mass damper; wind-induced vibration; vibration control | ||
| Address | ||
| Huawei Niu, Zhengqing Chen and Xugang Hua: Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082,, Hunan, China Wei Zhang: Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA | ||