Optimization for vertical stabilizers on flutter stability of streamlined box girders with mountainous environment

Guo, Junjie; Tang, Haojun; Li, Yongle; Wu, Lianhuo; Wang, Zewen

doi:10.1177/1369433219868077

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…As previous studies have described (Guo et al, 2020; Tang et al, 2018), the movement of vortex formed at the windward side toward the leeward side is the main cause of flutter. When the box girder moves clockwise, the vortex exists on the windward side of the box girder, and when the box girder moves counterclockwise, the vortex just moves to the leeward side of the box girder, and the vortex will promote the rotation of the box girder.…”

Section: Aerodynamic Mechanism Of Thenon-divergent Fluttermentioning

confidence: 59%

Effects of guardrails on wind environment for vehicles and aerodynamic stability for bridges with box girders

Guo

Tang

et al. 2020

Advances in Structural Engineering

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Normally strong winds in mountainous areas possess potential threats to the safety of vehicles travelling over the long-span bridges. Generally, decreasing the porosity of the guardrails could improve wind environment for vehicles, while the changed flow field around the bridge’s girder may weaken the structural aerodynamic stability simultaneously. To solve the two seemingly contradictory issues, such a long-span suspension bridge in mountainous areas is taken as the case study, and the guardrails are optimized with different schemes. The effects on wind environment for vehicles under normal traffic conditions are first studied by computational fluid dynamics (CFD) simulations. The further effects on the aerodynamic stability of the bridge under extreme winds are then determined by wind tunnel tests, and the observed non-divergent flutter is explainedbythe change in dynamic flow field. Results show that reducing the porosity of guardrails does improve the wind environment above the bridge deck, and the improvement on wind environment increases with the increase in angle of attack. After closing the guardrails completely, however, the girder appears non-divergent vibration different from the linear theoretical flutter when the critical wind speed is exceeded. The different post-flutter behaviors at different angles of attack are mainly related to the synchronization condition between the movement of vortex and the motion of the girder.

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Section: Aerodynamic Mechanism Of Thenon-divergent Fluttermentioning

confidence: 59%

Effects of guardrails on wind environment for vehicles and aerodynamic stability for bridges with box girders

Guo

Tang

et al. 2020

Advances in Structural Engineering

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“…Meanwhile, the simple bridge sections [44,45], such as box girder, are usually selected for the numerical simulation. However, most long-span high-speed railway bridges adopt plate-truss structure as the main girder, which has a very complex aerodynamic shape that the current numerical simulation techniques are usually incapable of yielding accurate prediction results [46].…”

Section: Static Wind Loadsmentioning

confidence: 99%

A comprehensive review on coupling vibrations of train–bridge systems under external excitations

Xiang

Wang

et al. 2022

Rail. Eng. Science

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In recent years, high-speed railways in China have developed very rapidly, and the number and span of the railway bridges are keeping increasing. Meanwhile, frequent extreme disasters, such as strong winds, earthquakes and floods, pose a significant threat to the safety of the train–bridge systems. Therefore, it is of paramount importance to evaluate the safety and comfort of trains when crossing a bridge under external excitations. In these aspects, there is abundant research but lacks a literature review. Therefore, this paper provides a comprehensive state-of-the-art review of research works on train–bridge systems under external excitations, which includes crosswinds, waves, collision loads and seismic loads. The characteristics of external excitations, the models of the train–bridge systems under external excitations, and the representative research results are summarized and analyzed. Finally, some suggestions for further research of the coupling vibration of train–bridge system under external excitations are presented.

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“…Through flutter derivatives and the motion state of the main girder, the aerodynamic drag force, lift force, and pitching moment can be determined. The flutter derivatives can be obtained by measuring the aerodynamic force at a limited number of wind speeds via the wind tunnel test [14][15][16] and a computational fluid dynamics (CFD) study [17][18][19][20]. The classical Scanlan model is linearized.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Jiang

et al. 2023

Sustainability

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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.

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Optimization for vertical stabilizers on flutter stability of streamlined box girders with mountainous environment

Cited by 7 publications

References 21 publications

Effects of guardrails on wind environment for vehicles and aerodynamic stability for bridges with box girders

Effects of guardrails on wind environment for vehicles and aerodynamic stability for bridges with box girders

A comprehensive review on coupling vibrations of train–bridge systems under external excitations

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

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