Study of wind pressure distribution characteristics of large-span fan-shaped roof under downburst

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Nov.2025, Vol.48 No.11: 1556-1563

DOI: 10.3969/j.issn.1003-5060.2025.11.018

Authors

WANG Hui $ ^{1} $, TANG Zhiyuan $ ^{1} $, LI Jiangjiang $ ^{1} $, ZHONG Caimin $ ^{2} $, SANG Lijuan $ ^{2} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Shanghai Zhongsen Architectural and Engineering Designing Consultants Co., Ltd., Shanghai 200062, China)

Abstract and Keywords

Abstract: Downbursts have completely different wind field characteristics compared to normal winds and can be extremely damaging to large-span roofs. Based on the computational fluid dynamics (CFD) downburst analytical model, the RNG $ k\varepsilon $ turbulence model is used to simulate the wind pressure on the large-span fan-shaped roof. The wind pressure distribution characteristics and the effect of wind directions on the wind pressure on the fan-shaped roof under stationary and moving downbursts are analyzed, and the differences in wind effect between the downburst wind field and the normal wind field are compared. The results show that the wind pressure distribution trends of the fan-shaped roof under stationary and moving downbursts are different, and the wind pressure on the roof increases significantly under moving downburst, with the maximum value being double that under stationary downburst; unlike moving downburst, the change of airflow on the roof under stationary downburst will change the direction of pressure in the local area. The wind direction angle has a significant impact on the wind pressure distribution on the roof, with the most pronounced impact observed under moving downburst. The trends of wind pressure changes in the roof area under the three types of wind profiles remain the same, with the entire roof subjected to the greatest suction at a wind direction of $ 225^{\circ} $, and under moving downburst, the average wind pressure coefficient in the roof intersection area can reach up to -3.00. The roof wind pressure is similar under stationary downburst and normal wind. For engineering assessments of large-span roofs under stationary downburst wind loads, the normal wind field scenario can serve

Keywords: downburst; analytical model; large-span fan-shaped roof; wind pressure coefficient; numerical simulation

作者信息

王辉 $ ^{1} $，汤志远 $ ^{1} $，李将将 $ ^{1} $，钟才敏 $ ^{2} $，桑立娟 $ ^{2} $

(1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 上海中森建筑与工程设计顾问有限公司，上海 200062)

摘要和关键词

摘要: 下击暴流具有与常态风完全不同的风场特性, 对大跨屋盖破坏极大。文章基于计算流体力学暴流解析模型, 采用 RNG $ k-\varepsilon $ 湍流模型对大跨度扇形屋盖进行风压模拟研究, 分析静止暴流和移动暴流下扇形屋盖风压分布特性及风向对风压的影响, 并比较暴流场与常态风场之间风效应的差异特性。结果表明: 静止暴流和移动暴流作用下扇形屋面风压分布趋势不同, 移动暴流下屋盖风压显著增大, 最大可达 1 倍; 不同于移动暴流, 静止暴流下屋面气流变化会使局部区域压力方向改变。风向角对屋面风压分布影响显著, 其中移动暴流作用时风向影响最大, 3 类风剖面下屋面区域风压变化趋势一致, 均在风向 $ 225^{\circ} $ 时整体屋盖受吸力最大, 且在移动暴流下屋盖交接区平均风压系数最大可达 -3.00。静止暴流和常态风下屋盖风压接近, 工程上若需考虑大跨屋盖静止暴流风荷载作用, 可以参考良态风场情况, 而移动暴流下屋盖多数区域风压骤增, 在抗风研究时需重点关注。

关键词: 下击暴流；解析模型；大跨扇形屋盖；风压系数；数值模拟

Funding

安徽省自然科学基金资助项目(11040606M116);教育部留学回国人员科研启动基金资助项目(教外司留 $$ 2011 $$ 1568号)和亚热带建筑科学国家重点实验室开放课题资助项目(2020ZB24)

合肥工业大学学报(自然科学版)

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