Measurements of flutter derivatives of a bridge deck sectional model

• Autorzy: Gunawan L. , Hafizh H. , Muhammad H.
• Języki publikacji: EN

Abstrakty

EN

Aeroelastic phenomena should be considered during the design phase of long span bridges. One of the aeroelastic problems is flutter, the dynamic instability that may cause structural failure at a wind speed called the flutter speed. The prediction of flutter speed of a bridge needs a thorough modelling of bridge stiffness, inertias, and especially its unsteady aerodynamic forces. The potential flow theory is not applicable to calculate unsteady aerodynamics of oscillating bridges due to their non-streamlined complex geometry, and the non-avoidable flow separation. For these reasons, a semi empirical model proposed by Scanlan is used to describe unsteady aerodynamic forces on an oscillating bridge deck. In this model, relation between unsteady aerodynamic forces and motion of the bridge is modelled using parameters known as flutter derivatives. The values of flutter derivatives can be identified from the free vibration responses of an elastic bridge at several wind-speeds. This paper presents wind tunnel tests and flutter derivatives identification of a sectional aeroelastic bridge model. Modified Ibrahim Time Domain method was applied to identify the eigenvalues and eigenvectors of the model at each wind speed, from which the flutter derivatives can be calculated. The results show that the measurement procedure is able produce flutter derivatives, which are in good agreement with those obtained by other researchers.

Słowa kluczowe

EN

transport; road transport

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2013
• Tom: Vol. 20, No. 4
• Strony: 107--116
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Gunawan L.

• Institut Teknologi Bandung Faculty of Mechanical and Aerospace Engineering Ganesa 10, Bandung 40132, Indonesia tel.: [phone], fax: [phone]

autor

Hafizh H.

• Institut Teknologi Bandung Faculty of Mechanical and Aerospace Engineering Ganesa 10, Bandung 40132, Indonesia tel.: [phone], fax: [phone]

autor

Muhammad H.

• Institut Teknologi Bandung Faculty of Mechanical and Aerospace Engineering Ganesa 10, Bandung 40132, Indonesia tel.: [phone], fax: [phone]

Bibliografia

• [1] Koughan, J., The Collapse of the Tacoma Narrows Bridge, Evaluation of Competing Theories of Its Demise, and the Effects of the Disaster of Succeeding Bridge Designs, The Univ. of Texas at Austin, Uniteed States 1996.
• [2] Billah, K. Y., Scanlan, R. H., Resonance, Tacoma Narrows Bridge Failure, and Under-Graduate Physics Textbooks, American Journal of Physics, Vol. 59, pp. 118-124, 1991.
• [3] Gunawan, L., Sangaji, S., Experimental Aeroelastic Study of a Cable Stayed Bridge, Proc. Experimental & Theoretical Mechanic 2002, Sanur, Bali, Indonesia 2002.
• [4] Fariduzzaman, Geometry and Wind Turbulence Effects on Vortex Induced Vibration of Long Span Bridge Deck, Ph.D. Dissertation, Dept. of Aero- and Astronautics, Institut Teknologi Bandung, Indonesia 2007.
• [5] Scanlan, R. H., Tomko, J. J., Airfoil and Bridge Deck Flutter Derivatives, Journal of the Engineering Mechanics Division, Vol. 97 (EM 6), pp. 1717-1737, 1971.
• [6] Theodorsen, T., General Theory of Aero-dynamic Instability and The Mechanism of Flutter, NACA Technical Report 496, 1935.
• [7] Sarkar, P. P., New Identification Methods Applied to the Response of Flexible Bridges to Wind, Ph.D. Dissertation, The John Hopkins University, Baltimore, MD, United States 1992.
• [8] Hafizh, H., Identification of Flutter Derivatives of Bridge Deck from Wind Tunnel Test Data, Master Thesis, Dept. of Aero-Astronautics, Institut Teknologi Bandung, Indonesia 2010.
• [9] Ibrahim, S. R., Mikulcik, E. C., A Method for the Direct Identification of Vibration Parameters from the Free Response, The Shock and Vibration Bulletin, Bulletin 47, Part 4, 1977.
• [10] Gu, M., Zhang, R., Xiang, H., Identification of Flutter Derivatives of Bridge Decks, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 84, pp. 151-162, 2000.
• [11] Li, Y., Liao, H., Qiang, S., Weighting Ensemble Least-Square Method for Flutter Derivatives of Bridge Decks, Journal of Wind Engineering & Industrial Aerodynamics, Vol. 91, pp. 713-721, 2003.