An Analytical Solution for Unsteady Aerodynamic Forces on Streamlined Box Girders with Coupled Vibration

Lianhuo Wu, Mingjin Zhang (), Fanying Jiang, Zelin Zhou and Yongle Li
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Lianhuo Wu: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Mingjin Zhang: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Fanying Jiang: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Zelin Zhou: China 19th Metallurgical Corporation, Chengdu 610031, China
Yongle Li: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China

Sustainability, 2023, vol. 15, issue 9, 1-14

Abstract: This paper is a contribution to analyzing the aerodynamic forces on a streamlined box girder (SBG) with coupled vibration in a potential flow. The key enabling step was to assume that the normal velocity of the airflow at an arbitrary point on the surface of the SBG was equal to the normal velocity of the surface motion. The aerodynamic drag force, lift force, and pitching moment were expressed as functions of the motion state of the SBG and the SBG’s shape-related parameters. To investigate the applicability of this force model, the analytical solution at various angles of attack was compared with a numerical simulation in a viscous flow. The results imply that the amplitude of the analytical lift force and pitching moment agree well with the numerical results under the angles of attack of 0° and ±3°. Furthermore, the analytical drag force effectively predicts the second-order phenomenon resulting from the multiplication of the vertical and torsional vibration velocities. As a consequence, the present analytical solution provides an effective method for analyzing the aerodynamic forces acting on SBGs with coupled vibration.

Keywords: aerodynamic forces; streamlined box girder; coupled vibration; potential flow; second-order component (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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