Effects of Inhomogeneous Wind Fields on the Aerostatic Stability of a Long-Span Cable-Stayed Bridge Located in a Mountain-Gorge Terrain
Publication: Journal of Aerospace Engineering
Volume 33, Issue 3
Abstract
This study investigates the effects of inhomogeneous wind fields on the aerostatic stability of a long-span cable-stayed bridge, which straddles a typical mountain-gorge terrain. Inhomogeneous wind fields, with featured wind speeds and wind attack angles, along the bridge’s main beam were firstly analyzed by using the computational fluid dynamics (CFD) approach. Then, a nonlinear methodology was implemented by adopting the ANSYS parametric design language (APDL) technology to analyze the aerostatic stability of long-span bridge under inhomogeneous wind speeds and inhomogeneous wind attack angles. The effects of inhomogeneous wind attack angles, inhomogeneous wind speeds, and both inhomogeneous wind speeds and inhomogeneous wind attack angles on the bridge’s aerostatic stability were comprehensively investigated. The aerostatic deformation of the bridge’s main beam and the variation of the cable’s axial force were also analyzed. The results show that the critical wind speed of the aerostatic instability under inhomogeneous wind attack angles is much smaller than that under homogeneous ones, and the performance of the aerostatic stability under inhomogeneous wind attack angles mainly depends on the peak wind attack angle rather than the average value of those inhomogeneous wind attack angles along the main beam. The wind-load effects acting on the main beam under inhomogeneous wind speeds are larger than those under homogeneous ones, and the critical wind speed of the aerostatic instability under inhomogeneous wind speeds is mainly determined by both the average and peak wind speeds along the main beam. The shapes of vertical displacements and torsion angles along the main beam are mainly dominated by the wind attack angles. However, the lateral displacements along the main beam are relatively independent, where the shapes are generally symmetrical to the midspan line and the values are mainly dominated by the oncoming wind speeds.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant Nos. 51878080, 51822803, 51778073, and 51408496, the Hunan Provincial Natural Science Foundation of China under Grant No. 2018JJ3538, the Educational Commission of Hunan Province of China under Grant No. 17C0056, the Open Fund of Hunan Province Key Laboratory of Bridge Engineering (Changsha University of Science and Technology) under Grant No. 18KD05, and the Innovative Project of Superiority Characteristic Key Discipline of Civil Engineering (Changsha University of Science and Technology) under Grant No. 18ZDXK10.
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Published In
Journal of Aerospace Engineering
Volume 33 • Issue 3 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 30, 2019
Accepted: Oct 15, 2019
Published online: Feb 25, 2020
Published in print: May 1, 2020
Discussion open until: Jul 25, 2020
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