Wind and Structures

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Aerodynamic properties of a streamlined bridge-girder under the interference of trains

  • Li, Huan (National Engineering research center for High Speed Railway construction, Central South University) ;
  • He, Xuhui (National Engineering research center for High Speed Railway construction, Central South University) ;
  • Hu, Liang (NatHaz Modeling Laboratory, University of Notre Dame) ;
  • Wei, Xiaojun (National Engineering research center for High Speed Railway construction, Central South University)
  • Received : 2021.11.15
  • Accepted : 2022.08.24
  • Published : 2022.09.25
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Abstract

Trains emerging on a streamlined bridge-girder may have salient interference effects on the aerodynamic properties of the bridge. The present paper aims at investigating these interferences by wind tunnel measurements, covering surface pressure distributions, near wake profiles, and flow visualizations. Experimental results show that the above interferences can be categorized into two primary effects, i.e., an additional angle of attack (AoA) and an enhancement in flow separation. The additional AoA effect is demonstrated by the upward-moved stagnation point of the oncoming flow, the up-shifted global symmetrical axis of flow around the bridge-girder, and the clockwise-deflected orientation of flow approaching the bridge-girder. Due to this additional AoA effect, the two critical AoAs, where flow around the bridge-girder transits from trailing-edge vortex shedding (TEVS) to impinging leading-edge vortices (ILEV) and from ILEV to leading-edge vortex shedding (LEVS) of the bridge-girder are increased by 4° with respect to the same bridge-girder without trains. On the other hand, the underlying flow physics of the enhancement in flow separation is the large-scale vortices shedding from trains instead of TEVS, ILEV, and LEVS governed the upper half bridge-girder without trains in different ranges of AoA. Because of this enhancement, the mean lift and moment force coefficients, all the three fluctuating force coefficients (drag, lift, and moment), and the aerodynamic span-wise correlation of the bridge-girder are more significant than those without trains.

Keywords

Acknowledgement

The support of the Natural Science Foundation of Hunan province (2021JJ40744), the Open Research Fund of State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures (KF2022-05), the National Natural Science Foundations of China (U1934209, 51925808), and Science and Technology Research and Development Program Project of China railway group limited (Major Special Project, 2021-Special-04-2) are gratefully acknowledged. Funding provided by the Moran Professorship in supporting this study at Notre Dame is gratefully acknowledged.

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