摘要
采用基于Reynolds时均方法(RANS方法)模拟下击暴流风场,在与已有试验数据进行对比验证的基础上,模拟分析立面开洞对低层建筑内外风压分布的影响,侧重考虑建筑处于径向最大风速位置(r/D0=1.0),风向、开洞位置、开洞面数和开洞率的变化对内外风压分布的影响。分析结果表明:与封闭建筑相比,单面开洞建筑屋面内外合风压系数明显增大,在0°风向作用下,7.5%的开洞率引起开洞建筑屋面内外合风压系数的最大增幅,总体平均增幅约为300%;开洞面数的变化对建筑内风压有显著影响,在0°风向作用下,相对于单面开洞建筑,三面开洞建筑各分区内风压系数降低的幅度最大,降幅的最大值约为150%;在侧面开洞时,位置变化对建筑内外表面风压均有较大影响,对比同一分区处各工况间风压变化,最大外风压系数差为0.4左右,出现在侧面靠近迎风转角区域(D1、E1),各分区内风压系数差均约为0.4;风向变化对建筑内压也产生一定影响,可导致其值发生正负改变。当风向为30°时,相较于0°风向,双面开洞建筑侧面靠近背风转角区域(D4)内风压变化最大,内风压系数由-0.2变为0.32。
The downburst wind field is simulated by RANS time-averaged simulation method which is based on comparison and verification with existing test data,and facade opening effect on wind pressure distribution inside and outside low-rise building is simulated and analyzed.Focusing on considering that the building is in the radial maximum wind speed position(r/D_(0)=1.0),and effects of changes in wind direction,opening location,number of opening surfaces and opening rate on the distribution of inside and outside wind pressure.The analysis results show that,compared with closed buildings,the combined wind pressure coefficients of the inside and outside roof for single-sided opening buildings increased significantly.When wind direction is 0 degrees,the maximum increase is caused by the opening rate of 7.5%,with an overall average value about 300%.Changing of the number of opening surfaces also has a significant impact on wind pressure inside building.When wind direction is 0 degrees,compared with single-sided opening buildings,wind pressure coefficient of three-sided opening inside buildings decreases most,the maximum value is about 150%.The position changing has a great influence on wind pressure distribution inside and outside building when side opening,compared wind pressure changes between various working conditions in the same zone and the maximum difference of outside pressure coefficient is about 0.4,which occurs on the side near the windward corner area(D1、E1),and the difference of inside pressure coefficient for each zone is about 0.4.Changing of wind direction also has a certain influence on wind pressure distribution inside building,which can cause positive and negative changes of the value.Compared to 0°,when the wind direction is 30°,inside wind pressure changes the most in the area near the leeward corner(D4)on the side of the building with double-sided opening,and inside wind pressure coefficient changes from-0.2 to 0.32.
作者
王辉
周正
戴根
唐静
Wang Hui;Zhou Zheng;Dai Gen;Tang Jing(School of Civil and Hydraulic Engineering,Hefei University of Technology,230009,Hefei,China;South China University of Technology,State Key Lab of Subtropical Building Science,510640,Guangzhou,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2021年第5期1903-1909,共7页
Chinese Journal of Applied Mechanics
基金
亚热带建筑科学国家重点实验室开放课题(2020ZB24)
教育部留学回国人员科研启动基金(教外司留[2011]1568号)
安徽省自然科学基金(11040606M116)。
关键词
下击暴流
低层建筑
立面开洞
表面风压
数值模拟
downburst
low-rise buildings
facade opening
wind pressure on surface
numerical simulation
