(1 湖南省建筑设计院集团股份有限公司, 长沙 410012;2 湖南大学风工程与桥梁工程湖南省重点实验室, 长沙 410082)

摘要: 因高层建筑结构具有自振周期较长、阻尼低以及沿高度分布质量较轻的特点,风荷载往往成为高层建筑设计的主要控制荷载,而高层建筑的外形对结构的抗风性能影响显著,为研究不同横截面高层建筑的气动特性,采用数值模拟方法,对六种不同截面(方形、矩形及 10%修正率的削角、凹角截面)的气动特性进行了全风向下数值模拟计算,分析比较了不同截面的风压系数、气动力系数以及斯托罗哈数等参数。 结果表明:削角、凹角截面可以有效减小气动阻力,其中,削角截面减阻效果最为明显,在小风向角下阻力可以最大减小 30%。 但是,削角、凹角截面的角点上风压系数变化剧烈,其中最大可达到未修正截面的 14 倍之多,且相比于未修正截面,削角、凹角截面风压系数受紊流度影响较大。

关键词: 高层建筑; 削角截面; 凹角截面; 气动特性; 气动阻力

中图分类号:TU312,TU972 文献标志码:A 文章编号:1002-848X(2022)22-0095-06

DOI:10. 19701 / j. jzjg. ZJ220077

Study on aerodynamic characteristics of high-rise buildings with chamfered and concave corners

LIU Jianwen1, LIAO Zhaoyang2, DENG Yangchen2

(1 Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China; 2 Key Laboratory for Windand Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract: Due to the long natural vibration period, low damping and light distribution of mass along the height of high-risebuilding structures, wind load is often the main control load in high-rise building design. The shape of high-rise buildinghas a significant influence on the wind resistance of structures. In order to study the aerodynamic characteristics of high-risebuildings with different cross-sections, the numerical simulation method was used to simulate and calculate the aerodynamiccharacteristics of six different sections (square, rectangular, and chamfered and concave section with 10% correction rate)numerically in full wind down. The parameters such as wind pressure coefficient, aerodynamic coefficient and StrouhalNumber of different sections were analyzed and compared. The results show that the chamfered and concave sections caneffectively reduce the aerodynamic drag, among which the chamfered section has the most obvious drag reduction effect,and the drag can be reduced by 30% at a small wind direction angle. However, the wind pressure coefficients at the cornersof the chamfered and concave sections change drastically, and the maximum can be as much as 14 times that of theuncorrected sections. Compared with the uncorrected sections, the wind pressure coefficients of the chamfered and concavesections are largely affected by the turbulence intensity.

Keywords:high-rise building; chamfered section; concave section; aerodynamic characteristics; aerodynamic drag

∗大泽湖海归小镇国际社区配套设施研究(KY03-0000-2022-0011)。

第一作者:刘建文,硕士,正高级工程师,一级注册结构工程师,主要从事建筑结构设计,Email:570190762@ qq. com。

[引用本文] 刘建文,廖朝阳,邓羊晨. 削角、凹角截面高层建筑气动力研究[ J]. 建筑结构,2022,52(22):95-100.LIU Jianwen,LIAO Zhaoyang,DENG Yangchen. Study on aerodynamic characteristics of high-rise buildings with chamferedand concave corners[J]. Building Structure,2022,52(22):95-100.