Wind and Structures

  • 제22권2호
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  • Pages.211-234
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  • 2016
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Transient aerodynamic forces of a vehicle passing through a bridge tower's wake region in crosswind environment

  • Ma, Lin (Department of Civil Engineering, University of Hohai) ;
  • Zhou, Dajun (Department of Civil Engineering, University of Hohai) ;
  • Han, Wanshui (Department of Bridge Engineering, University of Chang'an) ;
  • Wu, Jun (Department of Bridge Engineering, University of Chang'an) ;
  • Liu, Jianxin (Department of Bridge Engineering, University of Chang'an)
  • 투고 : 2015.03.30
  • 심사 : 2015.12.17
  • 발행 : 2016.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Super long-span bridges provide people with great convenience, but they also bring traffic safety problems caused by strong wind owing to their high decks. In this paper, the large eddy simulation together with dynamic mesh technology in computational fluid dynamics (CFD) is used to explore the mechanism of a moving vehicle's transient aerodynamic force in crosswind, the regularity and mechanism of the vehicle's aerodynamic forces when it passes through a bridge tower's wake zone in crosswind. By comparing the calculated results and those from wind tunnel tests, the reliability of the methods used in the paper is verified on a moving vehicle's aerodynamic forces in a bridge tower's wake region. A vehicle's aerodynamic force coefficient decreases sharply when it enters into the wake region, and reaches its minimum on the leeward of the bridge tower where exists a backflow region. When a vehicle moves on the outermost lane on the windward direction and just passes through the backflow region, it will suffer from negative lateral aerodynamic force and yaw moment in the bridge tower's wake zone. And the vehicle's passing ruins the original vortex structure there, resulting in that the lateral wind on the right side of the bridge tower does not change its direction but directly impact on the vehicle's windward. So when the vehicle leaves from the backflow region, it will suffer stronger aerodynamic than that borne by the vehicle when it just enters into the region. Other cases of vehicle moving on different lane and different directions were also discussed thoroughly. The results show that the vehicle's pneumatic safety performance is evidently better than that of a vehicle on the outermost lane on the windward.

키워드

과제정보

연구 과제 주관 기관 : China national natural science foundation

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피인용 문헌

  1. Aerodynamic Interference Mechanism of Moving Vehicles on a Bridge Deck in Crosswind Environment vol.23, pp.4, 2018, https://doi.org/10.1061/(ASCE)BE.1943-5592.0001194
  2. Safety Prediction Using Vehicle Safety Evaluation Model Passing on Long-Span Bridge with Fully Connected Neural Network vol.2019, pp.None, 2016, https://doi.org/10.1155/2019/8130240
  3. Driving risk of road vehicle shielded by bridge tower under strong crosswind vol.96, pp.1, 2016, https://doi.org/10.1007/s11069-018-3554-y