Flutter Mode Transition of a Double-Main-Span Suspension Bridge in Full Aeroelastic Model Testing
Publication: Journal of Bridge Engineering
Volume 19, Issue 7
Abstract
The Maanshan Bridge over the Yangtze River in China is a new long-span suspension bridge with double main spans of and a closed streamlined cross section of single box deck. The flutter performance of the bridge was investigated via a wind tunnel test of a full bridge aeroelastic model at a geometric scale of 1:211. The test was conducted in both smooth and simulated boundary layer wind fields with various combinations of wind yaw and inclination angles. A unique and interesting flutter-mode transition behavior was observed in smooth flow. As wind speed approaches the flutter threshold, the model oscillation with the first antisymmetric torsional mode (A-T-1) transfers to alternate torsional oscillation between double spans, then transfers to oscillation with the first symmetric torsional mode (S-T-1), and then violent oscillation occurs. The mechanism of the phenomenon is unknown, and there may be no numerical method to simulate it to date. One possible reason for the flutter-mode transition is that a nonlinear aerodynamic self-excited force acting on the middle pylon dragged the full aeroelastic model into soft-type flutter. The other inference is that internal resonance occurred, in which energy transforms between two spans and between modes A-T-1 and S-T-1 at the same time.
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Acknowledgments
The authors gratefully acknowledge the following organizations for their support of the work described in this paper: the National Natural Science Foundation of China under grant 51208104, a project supported by the Natural Science Foundation of Jiangsu Province (grant No. BK2012344), the Research Fund for the Doctoral Program of Higher Education of China (RFDP) under grant 20120092120018, and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 7 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 26, 2013
Accepted: Mar 18, 2014
Published online: Apr 17, 2014
Published in print: Jul 1, 2014
Discussion open until: Sep 17, 2014
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