Wind and Structures

  • 제34권4호
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  • Pages.355-369
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  • 2022
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Reynolds number and scale effects on aerodynamic properties of streamlined bridge decks

  • Ma, Tingting (College of Ocean Science and Engineering, Shanghai Maritime University) ;
  • Feng, Chaotian (College of Ocean Science and Engineering, Shanghai Maritime University)
  • 투고 : 2021.10.19
  • 심사 : 2022.04.06
  • 발행 : 2022.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Section model test, as the most commonly used method to evaluate the aerostatic and aeroelastic performances of long-span bridges, may be carried out under different conditions of incoming wind speed, geometric scale and wind tunnel facilities, which may lead to potential Reynolds number (Re) effect, model scaling effect and wind tunnel scale effect, respectively. The Re effect and scale effect on aerostatic force coefficients and aeroelastic characteristics of streamlined bridge decks were investigated via 1:100 and 1:60 scale section model tests. The influence of auxiliary facilities was further investigated by comparative tests between a bare deck section and the deck section with auxiliary facilities. The force measurement results over a Re region from about 1×105 to 4×105 indicate that the drag coefficients of both deck sections show obvious Re effect, while the pitching moment coefficients have weak Re dependence. The lift coefficients of the smaller scale models have more significant Re effect. Comparative tests of different scale models under the same Re number indicate that the static force coefficients have obvious scale effect, which is even more prominent than the Re effect. Additionally, the scale effect induced by lower model length to wind tunnel height ratio may produce static force coefficients with smaller absolute values, which may be less conservative for structural design. The results with respect to flutter stability indicate that the aerodynamic-damping-related flutter derivatives 𝘈*2 and 𝐴*1𝐻*3 have opposite scale effect, which makes the overall scale effect on critical flutter wind speed greatly weakened. The most significant scale effect on critical flutter wind speed occurs at +3° wind angle of attack, which makes the small-scale section models give conservative predictions.

키워드

과제정보

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (grant number 52008240) and the Key Laboratory for Wind-Resistance Technology of Bridges, Ministry of Transport (grant number KLWRTBMC14-04).

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