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Wind and Structures
  Volume 30, Number 2, February 2020 , pages 119-131
DOI: https://doi.org/10.12989/was.2020.30.2.119
 


Experimental studies on the aerodynamic performance of two box girders with side openings
Jiaqi Wang, Tomomi Yagi, Jun Ushioda, Kyohei Noguchi, Naoki Nagamoto and Hiroyuki Uchibori

 
Abstract
    A butterfly web girder is a box-shaped girder with discretely distributed side openings along the spanwise direction. Until now, there have been few studies related to the aerodynamic performance of the butterfly web bridge. The objective of the current study was to clarify the effects of the side openings on the aerodynamic performance of the girder. Two butterfly web girders with side ratios B/D = 3.24 and 5, where B is the girder width and D is the depth, were examined through a series of wind tunnel tests. A comparison of the results for butterfly web girders and conventional box girders of the same shape confirmed that the side openings stabilized the vortex-induced vibration and galloping when B/D = 3.24, whereas the vortex-induced vibration and torsional flutter were stabilized when B/D = 5. The change in the flow field due to the side openings contributed to the stabilization against the vibration. These findings not only confirmed the good aerodynamic performance of the butterfly web bridge but also provided a new method to stabilize the box girder against aerodynamic instabilities via discretely distributed side openings.
 
Key Words
    butterfly web bridge; galloping; torsional flutter; vortex-induced vibration; Kármán vortex
 
Address
Jiaqi Wang: Dept. of Civil and Earth Resources Engineering, Kyoto Univ., Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Tomomi Yagi:Dept. of Civil and Earth Resources Engineering, Kyoto Univ., Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Jun Ushioda:Dept. of Civil and Earth Resources Engineering, Kyoto Univ., Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Kyohei Noguchi:Dept. of Civil and Earth Resources Engineering, Kyoto Univ., Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Naoki Nagamoto:Structural Engineering Service Dept., Sumitomo Mitsui Construction co., ltd., Tsukuda, Chuou-ku, Tokyo 104-0051, Japan
Hiroyuki Uchibori:Structural Engineering Service Dept., Sumitomo Mitsui Construction co., ltd., Tsukuda, Chuou-ku, Tokyo 104-0051, Japan
 

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