A study of Reynolds number effect on vortex-induced vibrations of a flat streamline box girder
LIU Qingkuan1,2,3, REN Ruosong3, SUN Yifei3, LI Zhen3, ZHENG Yunfei4
1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2. Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China;
3. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
4. Department of Railway Engineering, Shijiazhuang Institute of Railway Technology, Shijiazhuang 050043, China
Abstract：Wind tunnel test, an important approach to investigate vortex-induced vibration, may lead to a Reynolds number effect due to the limitations in scale and wind velocity. Moreover, the Reynolds number effect would also cause the deviation between the test values and real values. To investigate the Reynolds number effect on vortex-induced vibration of the flat streamlined box girder, the girder of a long-span cable-stayed bridge is selected to be the subject. In the vibration test, by adjusting the natural frequency of the dynamic model, vortex-induced vibrations under different Reynolds numbers were obtained to achieve the vibration characteristics and related Reynolds number effects. The wind pressure distribution of the girder surface and its contribution to the vortex-induced vibration were obtained in the pressure test. The results show that the vortex-induced vibration of the flat streamlined box girder is intensively affected by the Reynolds number. The vibration amplitudes at higher Reynolds numbers are lower than those at lower Reynolds numbers. The contribution of the upper surface of the girder to the vortex-induced vibration is greater than that of the lower surface, especially the downstream area. Under different Reynolds numbers, the fluctuating pressure distributions of the girder are significantly different, and the variation of the fluctuating pressure coefficient with the Reynolds number may be the reason for the Reynolds number effect of the vortex-induced vibration.
刘庆宽1,2,3，任若松3，孙一飞3，李震3，郑云飞4. 扁平流线型箱梁涡激振动雷诺数效应研究[J]. 振动与冲击, 2022, 41(4): 117-123.
LIU Qingkuan1,2,3, REN Ruosong3, SUN Yifei3, LI Zhen3, ZHENG Yunfei4. A study of Reynolds number effect on vortex-induced vibrations of a flat streamline box girder. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(4): 117-123.
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