Ground Effects on the Vortex-induced Vibration of Bridge Decks
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The present study investigated the ground effects on the VIV of a closed box girder based on wind tunnel tests and numerical methods. First, we presented a vibration measurement system for wind-tunnel test to simulate ground effects on the bridge girder. Second, we investigated the Strouhal number (St), the VIV lock-in phenomena over a range of wind velocities, and the maximum VIV amplitudes and their change laws in correlation with the height from the ground in two different ground conditions. The outcomes showed the following: that a low height from the ground can lead to high St numbers; that ground effects did not change the width of VIV lock-in range, but did impel VIVs to occur earlier in the uniform flow field; and that the maximum VIV amplitudes was reduced and the VIV lock-in range narrowed in the turbulent flow field. Finally, we conducted the numerical simulation method to study the ground effect mechanism on VIVs. The numerical results showed that the periodic vortex shedding will generate periodic forces on the structure, which leads to the occurrence of VIVs. Ground effects can speed up vortex shifting, whereas aerodynamic forces on the deck are weakened.
Keywordsground effects numerical simulation St number Vortex-Induced Vibration (VIV) wind tunnel test
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- Ge, Y. J., Yang, Y. X., and Cao, F. C. (2011). “VIV sectional model testing and field measurement of Xihoumen Suspension Bridge with twin box girder.” Proceedings of 13th International Conference on Wind Engineering, Netherlands, Amsterdam, pp. 11–15.Google Scholar
- Li, H., Laima, S., Ou, J., Zhao, X., Zhou, W., Yu, Y., Li, N., and Liu, Z. (2011). “Investigation of vortex-induced vibration of a suspension bridge with two separated steel box girders based on field measurements.” Engineering Structures, Vol. 33, No. 6, pp. 1894–1907, DOI: 10.1016/j.engstruct.2011.02.017.CrossRefGoogle Scholar
- Qin, Y., Qu, Q., Liu, P., Tian, Y., and Lu, Z. (2015). “DES study of the aerodynamic forces and flow physics of a delta wing in static ground effect.” Aerospace Science and Technology, Vol. 43, p. 423–436, DOI: 10.1016/j.ast.2015.04.004.Google Scholar
- Teng, W. U. and Ahsan Kareem. (2012). “An overview of Vortexinduced Vibration (VIV) of bridge decks.” Front. Struct. Civ. Eng., Vol. 6, No. 4, pp. 335–347, DOI: 10.1007/s11709-012-0179-1.Google Scholar
- Yang, W. and Yang, Z. G. (2014). “Aerodynamic investigation on design of tiltable end plate flow wingcraft.” Aircraft Enginnering and Aeros, Vol. 84, No. 1, pp. 4–12, DOI: 10.1108/00022661211194933.Google Scholar
- Zhou, S., Hua, X. G., Chen, Z. Q., and Chen, W. (2017). “Experimental investigation of correction factor for VIV amplitude of flexible bridges from an aeroelastic model and its 1:1 section model.” Engineering Structures, Vol. 141, pp. 263–271, DOI: 10.1016/j.engstruct.2017.03.023.CrossRefGoogle Scholar