Buffeting Forces on Static Trains on a Truss Girder in Turbulent Crosswinds
Publication: Journal of Bridge Engineering
Volume 23, Issue 11
Abstract
Experiments were conducted in a wind tunnel with scaled models to investigate the aerodynamic characteristics of a train on a steel truss girder. Simultaneous surface pressure measurements were conducted under two turbulent flow fields. The aerodynamic-force coefficients, aerodynamic-admittance functions, and spanwise correlation characteristics of buffeting forces on the train were examined. A mean pressure coefficient suction peak was observed at the windward roof corner, and a fairly uniform pressure distribution was observed on the leeward surface of the train. The variation of the wind angle of attack (–3° to 3°) and turbulent flow field had minimal effects on the spanwise correlation of buffeting forces, whereas the effects of the train position on the truss girder and spanwise distance were significant. The aerodynamic admittances of the train were found to be a function of the train position on the truss girder and turbulent flow field. The effect of the wind angle of attack (–3° to 3°) on the aerodynamic admittances of the lateral and lift forces was mainly in the low-frequency region. Finally, empirical expressions were proposed to facilitate engineering applications.
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Acknowledgments
The work described in this paper was fully supported by the National Natural Science Foundation of China (Grant 51778545), Project of Science Technology Research and Development Program of China Railway Corporation (Grant 2010G004—I), and the Open Project of the State Key Laboratory of Disaster Reduction in Civil Engineering (Grant SLDRCE-MB-03).
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 11 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Aug 28, 2017
Accepted: May 25, 2018
Published online: Aug 30, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 30, 2019
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