Abstract
Five representative girder cross sections with various slot widths are utilized to analyze the effects of center slots on their aerodynamic performance, based on wind-tunnel tests and theoretical analyses. It is shown that the favorable aerodynamic effects of the center slot on bridge decks depend on the aerodynamic shape of the box girders and on the slot widths rather than unconditionally improving the aeroelastic stability. Further investigation of a streamlined box girder with various slot widths results in a modified Selberg formula to calculate the critical flutter wind speed for design purposes, wherein the Lorentz peak-value function is utilized. The flutter mechanism is illustrated utilizing a two-dimensional three-degrees-of-freedom (2D-3DOF) analysis scheme. The results indicate that the center slot changes the participation level of the heaving motion at the flutter onset, which is highly correlated with the critical flutter wind speed. In addition, particle image velocimetry (PIV) and proper orthogonal decomposition (POD) techniques are employed to assist in revealing the aerodynamic stabilization mechanism of the center slotting of box girders.
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Acknowledgments
The authors gratefully acknowledge the support for the research work jointly provided by the National Science Foundation of China (Grant No. 51078276) and U.S. National Science Foundation Grant CMMI 09-28282, as well as from the Ministry of Transportation (Grant No. KLWRBMT-04), the Ministry of Science and Technology (Grant No. SLDRCE 10-B-05), and the Open Project of the State Key Lab for Disaster Reduction in Civil Engineering (SLDRCE13-MB-02).
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 5, 2013
Accepted: Mar 28, 2014
Published online: Jun 2, 2014
Published in print: Mar 1, 2015
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