Wind and Structures

  • 제10권5호
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  • Pages.463-479
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  • 2007
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Wind-induced self-excited vibrations of a twin-deck bridge and the effects of gap-width

  • Qin, X.R. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology, Institute of Mechanical Design and Its Theory, School of Mechanical Engineering, Tongji University) ;
  • Kwok, K.C.S. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology) ;
  • Fok, C.H. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology) ;
  • Hitchcock, P.A. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology) ;
  • Xu, Y.L. (Department of Civil and Structural Engineering, The Hong Kong Polytechnic University)
  • 투고 : 2006.03.29
  • 심사 : 2006.10.24
  • 발행 : 2007.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

A series of wind tunnel sectional model dynamic tests of a twin-deck bridge were conducted at the CLP Power Wind/Wave Tunnel Facility (WWTF) of The Hong Kong University of Science and Technology (HKUST) to investigate the effects of gap-width on the self-excited vibrations and the dynamic and aerodynamic characteristics of the bridge. Five 2.9 m long models with different gap-widths were fabricated and suspended in the wind tunnel to simulate a two-degrees-of-freedom (2DOF) bridge dynamic system, free to vibrate in both vertical and torsional directions. The mass, vertical frequency, and the torsional-to-vertical frequency ratio of the 2DOF systems were fixed to emphasize the effects of gap-width. A free-vibration test methodology was employed and the Eigensystem Realization Algorithm (ERA) was utilized to extract the eight flutter derivatives and the modal parameters from the coupled free-decay responses. The results of the zero gap-width configuration were in reasonable agreement with the theoretical values for an ideal thin flat plate in smooth flow and the published results of models with similar cross-sections, thus validating the experimental and analytical techniques utilized in this study. The methodology was further verified by the comparison between the measured and predicted free-decay responses. A comparison of results for different gap-widths revealed that variations of the gap-width mainly affect the torsional damping property, and that the configurations with greater gap-widths show a higher torsional damping ratio and hence stronger aerodynamic stability of the bridge.

키워드

참고문헌

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피인용 문헌

  1. Direct Approach to Extracting 18 Flutter Derivatives of Bridge Decks and Vulnerability Analysis on Identification Accuracy vol.28, pp.3, 2015, https://doi.org/10.1061/(ASCE)AS.1943-5525.0000413
  2. Effects of frequency ratio on bridge aerodynamics determined by free-decay sectional model tests vol.12, pp.5, 2007, https://doi.org/10.12989/was.2009.12.5.413
  3. Extraction of bridge aeroelastic parameters by one reference-based stochastic subspace technique vol.14, pp.5, 2007, https://doi.org/10.12989/was.2011.14.5.413
  4. Theoretical research on the identification method of bridge dynamic parameters using free decay response vol.38, pp.3, 2007, https://doi.org/10.12989/sem.2011.38.3.349
  5. Numerical study of wake and aerodynamic forces on a twin-box bridge deck with different gap ratios vol.30, pp.4, 2020, https://doi.org/10.12989/was.2020.30.4.367
  6. Aero-structural Optimization of Streamlined Twin-Box Deck Bridges with Short Gap Considering Flutter vol.26, pp.6, 2007, https://doi.org/10.1061/(asce)be.1943-5592.0001705