Buffeting Analysis of Long-Span Bridges under Typhoon Winds with Time-Varying Spectra and Coherences
Publication: Journal of Structural Engineering
Volume 146, Issue 12
Abstract
Typhoon winds near the external eye wall of a strong typhoon are extremely nonstationary and disastrous due to its vortex and convective origin as well as its high wind speeds. However, typhoon-induced nonstationary responses of long-span bridges are currently analyzed with the assumption of time-invariant wind coherence. By taking the Stonecutters cable-stayed bridge in Hong Kong under Typhoon Hato in 2017 as an example, this paper presents the time-varying wind spectra and coherences for the bridge based on the wind data recorded by the multiple anemometers installed on the bridge. The analytical framework for nonstationary buffeting analysis of long-span bridges under typhoon winds is enhanced by considering time-varying wind coherence and applied to the Stonecutters Bridge under Typhoon Hato. The computed responses are compared with the field measurement responses. The comparative results demonstrate the feasibility and accuracy of the enhanced framework for buffeting analysis of long-span bridges with time-varying wind spectra and coherences. Comparative results with the other two cases of time-invariant coherence functions also highlight the importance and necessity of considering the time-varying wind coherence in the nonstationary buffeting analysis of long-span bridges under typhoon winds.
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Data Availability Statement
Some or all data, models, or code used during the study were provided by a third party. Direct requests for these materials may be made to the provider as indicated in the Acknowledgements.
Acknowledgments
The authors would like to acknowledge the supports from The Hong Kong Polytechnic University (PolyU 4-ZVM9), the Natural Science Foundation of Jiangsu Province (Grant No. BK20190359), and the National Natural Science Foundation of China (Grant No. 51908125). The authors also want to thank the Hong Kong Highways Department for providing the authors with the monitoring data of the Stonecutters Bridge for academic research. Any opinions and conclusions presented in this paper are entirely those of the authors.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 12 • December 2020
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© 2020 American Society of Civil Engineers.
History
Received: Dec 25, 2019
Accepted: Jun 16, 2020
Published online: Sep 16, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 16, 2021
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