Buffeting-Induced Resonances of Hangers at a Long-Span Suspension Bridge and Mitigation Countermeasure
Publication: Journal of Bridge Engineering
Volume 26, Issue 9
Abstract
Buffeting-induced oscillations of hangers at a suspension bridge have been addressed in this work. The buffeting is obtained by a dynamic finite-element analysis procedure in the time domain, with simulated turbulent wind fields and experimentally obtained load parameters. Wind loadings inherent to the hangers are neglected intentionally to exclude potential interference. Dynamic properties of hangers are simulated by discretizing them into a number of elements. The numerical results show that a number of long hangers can experience large-amplitude oscillations due to the main structure’s buffeting at a moderate wind speed. Motions of the hangers are mainly contributed by their first-order modal shapes. The hangers oscillate in both directions in the horizontal plane, with motions in the longitudinal direction being more violent than in the lateral direction. Moreover, it is found that the dominant frequency of a single hanger in one direction differs slightly from that in the other, thereby causing an ever-changing phase angle between the two motions. Fourier transforms of the time series indicate that excitations resulting in the resonances are from the main cables. The functional motion component at cable-hanger intersections can be as small as a couple of millimeters, which can result in hangers’ motions as large as 300 mm. Replacement of steel wire hangers with carbon fiber-reinforced polymer (CFRP) ones can restrain effectively the resonance. However, replacements over an insufficient range of hangers may result in transferring of the resonance to neighboring ones, and a comprehensive mitigation necessitates replacements over quite a wide range along the bridge deck.
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Acknowledgments
For the work described in this paper, the authors express their gratitude for the financial support from the Hainan Provincial Natural Science Foundation of China (Grant No 520CXTD433). Authors are also indebted to the National Natural Science Foundation of China for research projects granted in recent years (Grant Nos. 51578233, 52068020, and 51938012).
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 11, 2021
Accepted: May 27, 2021
Published online: Jul 2, 2021
Published in print: Sep 1, 2021
Discussion open until: Dec 2, 2021
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Cited by
- Puja Haldar, Somnath Karmakar, State of the Art Review of Aerodynamic Effects on Bridges, Journal of The Institution of Engineers (India): Series A, 10.1007/s40030-022-00640-6, 103, 3, (943-960), (2022).
- Farhan Farid Reshi, Priyanka Singh, undefined Shivangil, Ravinder Kumar Tomar, S K Singh, Analysis and Design of Cable Stayed and Suspension Bridge Subjected to Wind Loading, IOP Conference Series: Earth and Environmental Science, 10.1088/1755-1315/889/1/012059, 889, 1, (012059), (2021).