Wind and Structures

Techno-Press (테크노프레스)
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Effects of deck's width-to-depth ratios and turbulent flows on the aerodynamic behaviors of long-span bridges

  • Lin, Yuh-Yi (Department of Civil Engineering, Tamkang University) ;
  • Cheng, Chii-Ming (Department of Civil Engineering, Tamkang University) ;
  • Lan, Chao-Yuan (Department of Civil Engineering, Tamkang University)
  • Received : 2002.12.20
  • Accepted : 2003.08.20
  • Published : 2003.08.25
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Abstract

This study investigates the effects of a bridge deck's width-to-depth (B/H) ratio and turbulence on buffeting response and flutter critical wind speed of long-span bridges by conducting section model tests. A streamlined box section and a plate girder section, each with four B/H ratios, were tested in smooth and turbulent flows. The results show that for the box girders, the response increases with the B/H ratio, especially in the vertical direction. For the plate girders, the vertical response also increases with the B/H ratio. However, the torsional response decreases as the B/H ratio increases. Increasing the B/H ratio and intensity of turbulence tends to improve the bridge's aerodynamic stability. Experimental results obtained from the section model tests agree reasonably with the calculated results obtained from a numerical analysis.

Keywords

Acknowledgement

Supported by : National Science Council (R. O. C.)

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