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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 173-179
Time-domain and frequency-domain approaches to identification of bridge flutter derivatives
Zhengqing CHEN()
Wind Engineering Research Center, Hunan University, Changsha 410083, China
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Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identified from the vibration testing data of a sectional model suspended in a wind tunnel. Making use of the forced vibration testing data of three sectional models, namely, a thin-plate model, a nearly streamlined model, and a bluff-body model, a comparative study was made to identify the flutter derivatives of each model by using a time-domain method and a frequency-domain method. It was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domain method and time-domain method, respectively, agree very well. Moreover, some of the flutter derivatives of each of the other two models identified with the two methods deviate to some extent. More precisely, the frequency-domain method usually results in smooth curves of the flutter derivatives. The formulation of time-domain method makes the identification results of flutter derivatives relatively sensitive to the signal phase lag between vibration state vector and aerodynamic forces and also prone to be disturbed by noise and nonlinearity.

Keywords long-span bridges      wind-induced vibration      flutter derivatives      forced vibration test      time-domain method      frequency-domain method     
Corresponding Authors: CHEN Zhengqing,   
Issue Date: 05 June 2009
 Cite this article:   
Zhengqing CHEN. Time-domain and frequency-domain approaches to identification of bridge flutter derivatives[J]. Front Arch Civil Eng Chin, 2009, 3(2): 173-179.
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Fig.1  Vibration excitation system in heave mode
Fig.2  Vibration excitation system in pitch mode
Fig.3  Cross section of experimental models. (a) TP22; (b) HM13; (c) DT09
Fig.4  Flutter derivatives for thin-plate sectional model BP22. (a) ; (b) ; (c) ; (d) ; (e) ; (f) ; (g) ; (h) . (angle of attack: 0°, frequency: 3 Hz, heaving amplitude: 14 mm, pitching amplitude: 2°)
Fig.5  Flutter derivatives for steel-box sectional model HM13. (a) ; (b) ; (c) ; (d) ; (e) ; (f) ; (g) ; (h) . (angle of attack: 0°, frequency: 3 Hz, heaving amplitude: 8 mm, pitching amplitude: 2°)
Fig.6  Flutter derivatives for bluff sectional model DT09. (a) ; (b) ; (c) ; (d) ; (e) ; (f) ; (g) ; (h) . (angle of attack: 0°, frequency: 2 Hz, heaving amplitude: 14 mm, pitching amplitude: 2°)
Fig.7  Global shift between results of two methods
Fig.8  Fitting failure for one experimental test in time domain method
1 Scanlan R H, Tomko J J. Airfoil and bridge deck flutter derivatives. Journal of the Engineering Mechanics Division, ASCE , 1971, 97: 1717-1737
2 Falco M, Curami A, Zasso A. Nonlinear effects in sectional model aeroelastic parameters identification. Journal of Wind Engineering and Industrial Aerodynamics , 1992, 42: 1321-1332
doi: 10.1016/0167-6105(92)90140-6
3 Chen Z Q, Yu X D, Yang G, Spencer B F, Jr. Wind-induced self-excited loads on bridges. Journal of Structural Engineering, ASCE , 2005, 131: 1783-1793
doi: 10.1061/(ASCE)0733-9445(2005)131:12(1783)
4 Larsen A, Walther J H. Aeroelastic analysis of bridge girder sections based on discrete vortex simulations. Journal of Wind Engineering and Industrial Aerodynamics , 1997, 67-68: 253-265
doi: 10.1016/S0167-6105(97)00077-9
5 Matsumoto M, Shiraishi N, Shirato H, Shigetaka K, Niihara Y. Aerodynamic derivatives of coupled/hybrid flutter of fundamental structural sections. Journal of Wind Engineering and Industrial Aerodynamics , 1993, 49: 575-584
doi: 10.1016/0167-6105(93)90051-O
6 Li Q C. Measuring flutter derivatives for bridge sectional models in water channel. Journal of Engineering Mechanics, ASCE , 1995, 121: 90-101
doi: 10.1061/(ASCE)0733-9399(1995)121:1(90)
7 Chen Zhengqing. Time domain method and error analysis to identify flutter derivatives of forced vibration. In: Proceedings of the 11th National Conference of Structural Wind Engineering , Sangya, China, 2003 (in Chinese)
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