Experimental studies on the aerodynamic performance of two box girders with side openings

다국어 초록 (Multilingual Abstract)

A butterfly web girder is a box-shaped girder with discretely distributed side openings along the spanwise direction. Until now, there have been few studies related to the aerodynamic performance of the butterfly web bridge. The objective of the current study was to clarify the effects of the side openings on the aerodynamic performance of the girder. Two butterfly web girders with side ratios B/D = 3.24 and 5, where B is the girder width and D is the depth, were examined through a series of wind tunnel tests. A comparison of the results for butterfly web girders and conventional box girders of the same shape confirmed that the side openings stabilized the vortex-induced vibration and galloping when B/D = 3.24, whereas the vortex-induced vibration and torsional flutter were stabilized when B/D = 5. The change in the flow field due to the side openings contributed to the stabilization against the vibration. These findings not only confirmed the good aerodynamic performance of the butterfly web bridge but also provided a new method to stabilize the box girder against aerodynamic instabilities via discretely distributed side openings.

참고문헌 (Reference)

1 Nguyen, D. T., "Vortex-induced vibration of a 5:1 rectangular cylinder: A comparison of wind tunnel sectional model tests and computational simulations" 175 : 1-16, 2018

2 Matsumoto, M., "Vortex-induced vibration and its effect on torsional flutter instability in the case of B/D = 4 rectangular cylinder" 96 (96): 971-983, 2008

3 Komatsu, S., "Vortex-induced oscillation of bluff cylinders" 6 : 335-362, 1980

4 Nakamura, Y., "Vortex excitation of prisms with elongated rectangular, H and [vdash] cross-sections" 163 : 149-169, 1986

5 Matsumoto, M., "Torsional flutter of bluff bodies" 69-71 : 871-882, 1997

6 Parkinson, G. V., "The square prisms as an aeroelastic non-linear oscillator" 17 : 225-239, 1964

7 Kwok, K.C.S., "The effects of freestream turbulence on a galloping square tower" 1977

8 Nakamura, Y., "The aerodynamic mechanism of galloping" 36 : 257-269, 1994

9 Matsumoto, M., "Steady galloping/unsteady galloping and vortex-induced vibration of bluff bodies associated with mitigation of Kármán vortex" 2008

10 Li, M., "Spanwise correlation of aerodynamic forces on oscillating rectangular cylinder" 154 : 47-57, 2016

11 Hourigan, K., "Self-sustained oscillations in flows around long blunt plates" 15 : 387-398, 2001

12 Chen, X., "Revisiting Multimode Coupled Bridge Flutter: Some New Insights" 132 : 1115-1123, 2006

13 Billah, K. Y., "Resonance, Tacoma Narrows bridge failure, and undergraduate physics textbooks" 59 : 118-124, 1991

14 Knisely, B. C., "Rectangular cylinders in flows with harmonic perturbations" 112 : 690-704, 1987

15 Mills, R., "Particle image velocimetry and visualization of natural and forced flow around rectangular cylinders" 478 : 299-323, 2003

16 Deniz, S., "Oscillating rectangular and octagonal profiles: Interaction of leading- and trailing-edge vortex formation" 11 : 3-31, 1997

17 Shiraishi, N., "On classification of vortex-induced oscillation and its application for bridge structures" 14 (14): 419-430, 1983

18 Kasuga, A., "Multi-span extradosed bridge" 2015

19 Den Hartog and J.P., "Mechanical Vibrations" Dover Publication 1985

20 Laneville, A., "Mean flow patterns around two-dimensional rectangular cylinders and their interpretation" 14 : 387-398, 1983

21 Dong, H., "Large-eddy simulation of stably stratified flow past a rectangular cylinder in a channel of finite depth" 170 : 214-225, 2017

22 Matsumoto, M., "Karman vortex effect on the aerodynamic forces to rectangular cylinders" 2006

23 Yongxin Yang, "Investigation on flutter mechanism of long-span bridges with 2d-3DOF method" 한국풍공학회 10 (10): 421-435, 2007

24 Yagi, T., "Interferences of vortex sheddings in galloping instability of rectangular cylinders" 59A : 552-561, 2013

25 R. Ajith Kumar, "Influence of corner radius on the near wake structure of a transversely oscillating square cylinder" 대한기계학회 23 (23): 2390-2416, 2009

26 Parkinson, G. V., "Galloping response of towers" 4 : 253-260, 1979

27 Nakamura, Y., "Galloping of rectangular cylinders in the presence of a splitter plate" 5 (5): 521-549, 1991

28 Naudascher, E., "Flow-induced vibrations of prismatic bodies and grids of prisms" 7 : 341-373, 1993

29 Naudascher, E., "Exploratory study on damping of galloping vibrations" 8 : 211-222, 1981

30 Mizota, T., "Experimental studies of time mean flows around rectangular prisms" 312 : 39-47, 1981

31 Andrianne, T., "Experimental and numerical investigations of the torsional flutter oscillations of a 4:1 rectangular cylinder" 41 : 64-88, 2013

32 Ge, Y., "Energy conversion mechanism of aerodynamic flutter of a box girder" 2016

33 Kasuga, A., "Effects of butterfly web design on bridge construction" 18 (18): 128-142, 2017

34 Nakato, S., "Correlation of fluctuating velocity in the wake of an oscillating square cylinder with openings or appendages" 2016

35 Wu, T., "An overview of vortex-induced vibration (VIV) of bridge decks" 6 : 335-347, 2012

36 Bearman, P., "An investigation of the flow around rectangular cylinders" 23 (23): 229-237, 1972

37 Nakaguchi, H., "An experimental study on aerodynamic drag of rectangular cylinders" 16 : 1-5, 1968

38 Scanlan, R. H., "Air foil and bridge deck flutter derivatives" 97 (97): 1717-1937, 1971

39 Okajima, A., "Aeroelastic instability of two rectangular cylinders in a tandem arrangement" 36 (36): 859-864, 1990

40 Hu, G., "Aerodynamic mechanisms of galloping of an inclined square cylinder" 148 : 6-17, 2016

41 Matsumoto, M., "Aerodynamic damping of prisms" 59 : 159-175, 1996