Control of Human-Induced Vibrations of a Curved Cable-Stayed Bridge: Design, Implementation, and Field Validation
Publication: Journal of Bridge Engineering
Volume 21, Issue 7
Abstract
This article describes the research work relating to the assessment and control of human-induced vibration of an unusual curved cable-stayed bridge with separate road and pedestrian decks. Dynamic simulations of human-induced vibration were performed with a mode-by-mode approach, and the results showed that a total of eight lateral and vertical modes of the bridge may suffer from excessive vibrations at the design crowd density. A hybrid control scheme was developed for control of human-induced vibration, which consists of steel braces fitted between the road bridge deck and the pedestrian deck to improve structural stiffness and eddy current tuned mass dampers to enhance damping ratios of lively modes. The modal properties of the bridge with steel braces were experimentally obtained by dynamic tests and used for parameter tuning of mass dampers. The performance of the hybrid control strategy was evaluated by group tests of up to 400 pedestrians. It is shown that the critical number of pedestrians triggering synchronous lateral excitation is generally in good agreement with the empirical model developed from measurements on the London Millennium Bridge, but the measured vertical acceleration amplitude is only about 40% of the prediction under the same pedestrian density. The damping ratios for both the vertical and lateral modes increase appreciably after installation of tuned mass dampers and no evidence of large-amplitude vibrations has been observed.
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Acknowledgments
The authors would like to acknowledge support from the National Science Foundation of China (51278189, 51422806, and 91215302). The collaboration of the Bureau of Municipal and Rural Construction of Mianyang, in particular Dr. Xiao-Xian Kang, is of special mention. Our colleagues and Ph.D. students, Mr. J. H. Wang, Dr. Z. H. Wang, Mr. W. X. Wang, and Mr. T. F. Hu, provided great assistance during the field tests. The participation of more than 400 undergraduate students from the Southwest University of Science and Technology is also acknowledged.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 21 • Issue 7 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: May 19, 2015
Accepted: Nov 4, 2015
Published online: Feb 3, 2016
Published in print: Jul 1, 2016
Discussion open until: Jul 3, 2016
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