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作 者:王磊[1,2] 璩华云[1] 邹良浩 梁枢果[2] 陈凯[3] WANG Lei;QU Huayun;ZOU Lianghao;LIANG Shuguo;CHEN Kai(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;School of Civil&Building Engineering,Wuhan University,Wuhan 430072,China;China Academy of Building Sciences,Beijing 100013,China)
机构地区:[1]河南理工大学土木工程学院,河南焦作454000 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]中国建筑科学研究院,北京100013
出 处:《建筑结构学报》2023年第5期78-88,共11页Journal of Building Structures
基 金:国家自然科学基金项目(51708186,51173859);建筑安全与环境国家重点实验室开放课题(2020BSBE-5)。
摘 要:为了研究圆截面细柔结构在高雷诺数下的升力系数和斯托罗哈数,对一座210 m高的混凝土烟囱进行了风压、风速现场实测。在该实测数据的基础上,统计总结已有现场实测结果,研究不同实测结果差异显著的原因,分析不同雷诺数和湍流度下升力系数和斯托罗哈数等参数的变化规律,建立了升力系数计算式。研究结果表明,在跨临界雷诺数范围内,湍流度引起的升力系数在数值上近似是纵向湍流度的40%,漩涡脱落升力系数随着雷诺数的增大依次呈稳定、增大、减小再稳定的变化趋势,而斯托罗哈数主要集中在0.22附近,不随雷诺数和湍流度变化。In order to study the lift coefficient and Strouhal number of high flexible structures with a circular-section under high Reynolds numbers,the wind pressure and wind speed of a 210 meter high concrete chimney were measured.On the basis of the field measured data of this study and the relevant existing research,the reasons for the significant differences in the field measured data by different scholars were compared and analyzed,the variation characteristics of parameters such as the RMS lift coefficient and Strouhal number under different Reynolds numbers and turbulence intensities were studied,and the empirical formula of lift coefficient was established.This study shows that the lift coefficient caused by turbulence is approximately 0.4 times that of along-wind turbulence destiny,and the lift coefficient caused by vortex shedding shows a trend of‘stable-rising-decreasing-stable'with the increase of Reynold number.The Strouhal number is mainly concentrated around 0.22 and generally independent of the turbulence intensity and the Reynold number.
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