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Experimental investigation on the adjustable wind barrier for the long-span strait bridge

Research Project

Project/Area Number 22K14316
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionYokohama National University

Principal Investigator

王 嘉奇  横浜国立大学, 大学院都市イノベーション研究院, 助教 (20902274)

Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsWind barrier / Long-span bridge / Aerodynamic performance / Vortex-induced vibration / Vehicle safety / Bluff box girder / Aerodynamic stability / Travelling safety / Wind environment
Outline of Research at the Start

The safety of the vehicles on the long-span bridges against the strong winds has been the main concern. Even though traffic regulation is applied, wind-induced traffic accidents still frequently occur. The wind barrier is most effective to protect the vehicles by directly reducing their wind-induced forces, but it potentially results in the unallowable wind-induced vibrations of the bridge. Therefore, this research intends to develop the wind barrier that can guarantee the safety of the vehicles and stability of the bridge against wind-induced vibrations.

Outline of Annual Research Achievements

To develop the wind barrier to guarantee the aerodynamic stability of both the bridge and the running vehicle on it, the below research based on wind tunnel tests was carried out. 1) We investigated the effects of the wind barrier on the aerodynamic response and wind environment of a bluff box girder. The wind barrier made the girder a larger amplitude of vortex-induced vibration than the bare girder. 2) We further investigated the mechanism of the abovementioned response using a rectangular cylinder. The wind barrier of 50% porosity ratio and with a triangle-section bar successfully stabilized the aerodynamic response to be the same as the bare girder. Additionally, the important role of the upside and downside surfaces of the bluff girder in its response is clarified.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Through a series of wind tunnel tests, the effects of the wind-barrier parameters on the aerodynamic performance and wind environment of a streamlined box girder, two bluff box girders, and a rectangular cylinder were clarified. Especially, the proposed wind barrier can stabilize the wind-induced vibrations of the abovementioned girders. Additionally, different from the streamlined box girder, the important role of the upside and downside surface of the bluff box girder in stabilizing the wind-induced vibration is clarified. The whole research can be evaluated as ‘making good progress’.

Strategy for Future Research Activity

To further investigate the mechanism related to the effects of the wind barrier on the aerodynamic response of the streamlined and bluff box girders, the relationship between the wind-barrier parameters and the aerodynamic damping/work distribution of the vibrating girder will be investigated through pressure measurement of the girder in the wind tunnel.

Report

(2 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (9 results)

All 2024 2023 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effect of wind barriers on aerodynamic performance and wind environment of two box girders with different side ratios2024

    • Author(s)
      アノシット ヴィライボン、勝地弘、王嘉奇
    • Journal Title

      Journal of Structural Engineering, A

      Volume: 70A Issue: 0 Pages: 331-341

    • DOI

      10.11532/structcivil.70A.331

    • ISSN
      1881-820X
    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] A study on stabilizing mechanism of flap countermeasures mitigating VIV of a box girder bridge section2023

    • Author(s)
      Phan Duc Tam, Hiroshi Katsuchi, Wang Jiaqi, Hiroshi Tamura, Kensho Hirao
    • Journal Title

      IOP Conference Series: Materials Science and Engineering 1289

      Volume: 1289 Issue: 1 Pages: 0-0

    • DOI

      10.1088/1757-899x/1289/1/012008

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] EXPERIMENTAL INVESTIGATION ON EFFECTS OF WIND BARRIER ON AERODYNAMIC STABILITY OF BRIDGE AND VEHICLE ON BRIDGE2022

    • Author(s)
      王 嘉奇, 佐藤 真希, 勝地 弘, 田村 洋
    • Journal Title

      Wind Engineering Research

      Volume: 27 Issue: 0 Pages: 198-206

    • DOI

      10.14887/windengresearch.27.0_198

    • ISSN
      2435-4384, 2435-5429
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Wind Barrier Effects on Aerodynamic Performance of Bluff Girder2023

    • Author(s)
      Anousit VILAIVONG, Hiroshi KATSUCHI, Jiaqi Wang, Ryoko MITSUHASHI
    • Organizer
      令和5年度土木学会全国大会第78回年次学術講演会
    • Related Report
      2023 Research-status Report
  • [Presentation] Experimental investigation on effects of wind barrier on the aerodynamic performance of the bridge2023

    • Author(s)
      Jiaqi Wang, Hiroshi Katsuchi
    • Organizer
      16th International Conference on Wind Engineering
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Experimental investigation on effects of wind barrier on aerodynamic stability of the bridge and the wind velocity on the bridge2023

    • Author(s)
      Hiroshi Katsuchi, Jiaqi Wang
    • Organizer
      16th International Conference on Wind Engineering
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effects of Wind Shield Walls on Aerodynamic Stability of Bluff-type Bridge Girder and Crosswind Environment2023

    • Author(s)
      ビライボン アノウシット, 勝地 弘, 王 嘉奇, 三橋 諒子
    • Organizer
      2023年度日本風工学会年次研究発表会
    • Related Report
      2023 Research-status Report
  • [Presentation] Investigation on Effects of the Wind Barrier on the Aerodynamic Stability of the Bridge and the Vehicle on the Bridge2022

    • Author(s)
      王 嘉奇, 勝地 弘, 佐藤 真希, 田村 洋
    • Organizer
      2022年度風工学会年次会
    • Related Report
      2022 Research-status Report
  • [Presentation] 遮風壁が橋梁の空力安定性および橋梁上の横風特性に与える影響に関する研究2022

    • Author(s)
      佐藤 真希, 勝地 弘, 王 嘉奇, 田村 洋
    • Organizer
      2022年度土木学会年次会
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2024-12-25  

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