Vortex induced vibration and flutter instability of two parallel cable-stayed bridges

다국어 초록 (Multilingual Abstract)

The objective of this work was to investigate the interference effects of two-parallel bridge decks on aerodynamic coefficients, vortex-induced vibration, flutter instability and flutter derivatives. The two bridges have significant difference in cross-sections, dynamic properties, and flutter speeds of each isolate bridge. The aerodynamic static tests and aeroelastic tests were performed in TU-AIT boundary layer wind tunnel in Thammasat University (Thailand) with sectional models in a 1:90 scale. Three configuration cases, including the new bridge stand-alone (case 1), the upstream new bridge and downstream existing bridge (case 2), and the downstream new bridge and the upstream existing bridge (case 3), were selected in this study. The covariance-driven stochastic subspace identification technique (SSI-COV) was applied to identify aerodynamic parameters (i.e., natural frequency, structural damping and state space matrix) of the decks. The results showed that, interference effects of two bridges decks on aerodynamic coefficients result in the slightly reduction of the drag coefficient of case 2 and 3 when compared with case 1. The two parallel configurations of the bridge result in vortex-induced vibrations (VIV) and significantly lower the flutter speed compared with the new bridge alone. The huge torsional motion from upstream new bridge (case 2) generated turbulent wakes flow and resulted in vertical aerodynamic damping H1* of existing bridge becomes zero at wind speed of 72.01 m/s. In this case, the downstream existing bridge was subjected to galloping oscillation induced by the turbulent wake of upstream new bridge. The new bridge also results in significant reduction of the flutter speed of existing bridge from the 128.29 m/s flutter speed of the isolated existing bridge to the 75.35 m/s flutter speed of downstream existing bridge.

참고문헌 (Reference)

1 Sato, H., "Wind-resistant design manual for highway bridges in Japan" 91 (91): 1499-1509, 2003

2 Boonyapinyo, V., "Wind-induced nonlinear lateral- torsional buckling of cable-stayed bridges" 120 (120): 486-506, 1994

3 Simiu, E., "Wind Effects on Structures" John Wiley 1996

4 Ehsan, F., "Vortex-induced vibrations of flexible bridges" 116 (116): 1392-1400, 1990

5 AES Group, "The Rama IX Bridge Tenth-Year Inspection"

6 Irwin, P., "Tacoma narrows 50 years later-wind engineering investigations for parallel bridges" 1 (1): 3-17, 2005

7 Zhang, Z. T., "Similarity of amplitude of sectional model to that of full bridge in the case of vortex-induced resonance" 44 (44): 77-82, 2011

8 Dallaire, P. O., "Sectional model tests of tandem bridge decks in dynamic suspension systems" 2016

9 Gu, M., "Parametric study on flutter derivatives of bridge decks" 23 (23): 1607-1613, 2001

10 Kim, S. J., "Operational field monitoring of interactive vortex-induced vibrations between two parallel cable-stayed bridges" 123 : 143-154, 2013

11 Shujin Laima, "Numerical study on Reynolds number effects on the aerodynamic characteristics of a twin-box girder" 한국풍공학회 28 (28): 285-298, 2019

12 Boonyapinyo, V., "Nonlinear aerostatic stability analysis of suspension bridges" 28 (28): 793-803, 2006

13 Zhu, L. D., "Mass simulation and amplitude conversion of bridge sectional model test for vortex-excited resonance" 22 (22): 204-208, 2005

14 Seo, J. W., "Interference effect on vortex-induced vibration in a parallel twin cable-stayed bridge" 116 : 7-20, 2013

15 Pospíšil, S., "Influence of stationary vehicles on bridge aerodynamic and aeroelastic coefficients" 22 (22): 05016012-, 2016

16 Boonyapinyo V., "Identification of flutter derivatives of bridge decks by stochastic subspace method" 2009

17 Kai Wang, "Flutter suppression of long-span suspension bridge with truss girder" 한국풍공학회 23 (23): 405-420, 2016

18 Andersen, S. A., "Flutter derivatives from free decay tests of a rectangular B/D=10 section estimated by optimized system identification methods" 156 : 284-293, 2018

19 Liu, Z., "Experimental study of aerodynamic interference effects on aerostatic coefficient of twin deck bridges" 3 (3): 292-298, 2009

20 Chuanxin Hu, "Effects of types of bridge decks on competitive relationships between aerostatic and flutter stability for a super long cable-stayed bridge" 한국풍공학회 28 (28): 255-270, 2019

21 Kimura, K., "Effects of separation distance on wind-induced response of parallel box girders" 96 (96): 954-962, 2008

22 Park, J., "Effect of the relative differences in the natural frequencies of parallel cable-stayed bridges during interactive vortex-induced vibration" 171 : 330-341, 2017

23 Park, J., "Effect of gap distance on vortex-induced vibration in two parallel cable-stayed bridges" 162 : 35-44, 2017

24 Epsilon Co. Ltd, "EXAT Bridge Project: Mode Shape of Structure"

25 Gu, M., "Direct identification of flutter derivatives and aerodynamic admittances of bridge decks" 26 (26): 2161-2172, 2004

26 Boonyapinyo, V., "Data-driven stochastic subspace identification of flutter derivatives of bridge decks" 98 (98): 784-799, 2010

27 Meng, X., "Aerodynamic interference effects and mitigation measures on vortex-induced vibrations of two adjacent cable-stayed bridges" 5 (5): 510-517, 2011

28 Larsen, S. V., "Aerodynamic interference between two closely spaced cable supported bridges" 2000

29 Argentini, T., "Aerodynamic interference and vortex-induced vibrations on parallel bridges: The Ewijk bridge during different stages of refurbishment" 147 : 276-282, 2015

30 Elena Dragomirescu, "Aerodynamic characteristics investigation of Megane multi-box bridge deck by CFD-LES simulations and experimental tests" 한국풍공학회 22 (22): 161-184, 2016

31 Boonyapinyo, V., "Advanced aerodynamic analysis of suspension bridges by state-space approach" 125 (125): 1357-1366, 1999