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Wind and Structures
  Volume 6, Number 4, July 2003 , pages 263-278

Effects of deck's width-to-depth ratios and turbulent flows on the aerodynamic behaviors of long-span bridges
Yuh-Yi Lin, Chii-Ming Cheng and Chao-Yuan Lan

    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.
Key Words
    width-to-depth ratio; turbulence; buffeting; flutter; section model; long-span bridge.
Department of Civil Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.

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