Spatial correlation of vortex-induced pressure of a square prism section model
ZHU Ledong 1,2,3 CHEN Xiuyu 1,2
1.State Key Laboratory of Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China；
2. College of Civil Engineering，Tongji University，Shanghai 200092，China；
3. Key Laboratory of Wind Resistance Technology of Bridges of Ministry of Transport，Tongji University，Shanghai 200092，China
Abstract：Vortex-induced vibration is a kind of wind-induced nonlinear self-limiting vibration with both forced and self-excited characteristics.Current research on vortex-induced vibration is mostly confined to the two-dimensional nonlinear mathematical model of vortex-induced force, and the span-wise correlation research is relatively less.In this paper, the square prismatic section model was used in the fixed and spring suspended wind tunnel test to analyze the span-wise correlation and chord-wise correlation of vortex-induced pressure in the static condition and vortex-induced resonance two cases.It was found that the span-wise correlation of the vortex-induced pressure is good when in resonance, it decays along the bridge span and is significantly increased with the amplitude.The correlation is much worse in static condition, the correlation coefficient decreases close to 0 with the increase of the span-wise distance.The correlation rule of vortex-induced pressure varies a lot in different points.
[1] 项海帆，葛耀君，朱乐东，等. 现代桥梁抗风理论与实践[M]. 北京：人民交通出版社，2005.
[2] Roshko A. On the development of turbulent wakes from vortex streets[R]. NACA REPORT 1191, 1954.
[3] E. Berger, R. Wille. Periodic flow phenomena[J]. Annual Review of Fluid Mechanics, 1972, 4: 313-340.
[4] C. H. K. Williamson. Defining a universal and continuous Strouhal-Reynolds number relationship for the laminar vortex shedding of a circular cylinder[J]. Physisc of Fluids, 1988, 31(10), 2742-2744.
[5] C. H. K. Williamson. Oblique and parallel modes of vortex shedding in the wake of a circular cylinder at low Reynolds numbers[J]. Journal of Fluid Mechanics, 1989, 206: 579-627.
[6]R. H. Wilkinson. Fluctuating pressures on an oscillating square prism. Part II. Spanwise correlation and loading[J]. Aero. Quarterly, 1981, 32(2): 111-125.
[7] 肖军.闭口流线型箱梁涡激力展向相关性研究:[硕士学位论文].长沙:湖南大学土木工程学院，2012.
[8] 黄来科.矩形断面涡激力展向相关性试验研究:[硕士学位论文].长沙:湖南大学土木工程学院，2013.
[9] 刘志文，黄来科，陈政清.矩形断面主梁涡激振动气动力展向相关性试验研究[J].振动工程学报，2017.
[10] 王孝楠.典型钝体断面涡激力特性及其跨向相关性研究:[硕士学位论文].成都:西南交通大学土木工程学院，2017.
[11] 孟晓亮.大跨度钢箱梁桥竖向涡激共振非线性特性和机理研究:[博士学位论文].上海:同济大学土木工程学院，2013.
[12] 杜林清.中央开槽箱梁涡激扭矩非线性机理和跨向相关性及其数学模型:[硕士学位论文].上海:同济大学土木工程学院，2014.
[13] Zhu Le-dong, Meng Xiao-liang, Xu You-lin. Spanwise correlation behaviors of vortex-shedding lift force on a flat closed box deck[C]. Proc.8th Asia-Pacific Conference on Wind Engineering, 2013, Chennai.
[14] Zhu Qing, Chen Bing-yao, Zhu Le-dong, Xu You-lin. Investigation on characteristics and span-wise correlation of vortex-induced forces on a twin-box deck using newly-developed wind-tunnel test technique[J]. Journal of Wind Engineering and Industrial Aerodynamics164 (2017) 69–81.
