坡角对双坡屋盖风荷载特性影响分析  

Influence of slope angle on wind load characteristics of gable roof

作　　者：王程 李方慧[2] 张杰 向本军 苏政忠 WANG Cheng;LI Fang-Hui;ZHANG Jie;XIANG Ben-Jun;SU Zheng-Zhong(Heilongjiang University School of Hydraulic and Electric Power,Harbin 150080,China;Heilongjiang University School of Civil and Engineering,Harbin 150080,China)

机构地区：[1]黑龙江大学水利电力学院,哈尔滨150080 [2]黑龙江大学建筑工程学院,哈尔滨150080

出　　处：《黑龙江大学工程学报》2022年第4期27-32,共6页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金面上项目(52078380)。

摘　　要：坡角变化对双坡屋盖表面风压的影响很大,采用Realizable k-ε湍流模型对典型双坡屋盖建筑的二维缩尺模型进行数值模拟。研究了不同坡角对屋面风压分布以及气动力系数变化的影响,并分析其对流场中湍流的形成与分离的变化规律。结果表明:屋脊处的极值吸力随着屋面坡度的增加而增大,而迎风屋檐处的极值吸力则随着屋面坡度的增加而减小。相比30°坡角,50°坡角背风面C P增加1.31倍,当坡角大于30°时,背风面离屋脊0.25 D处的风压增长较快,此处C P增加约50%/10°,可以确定30°为影响双坡屋盖风压分布的关键角度。The change of slope angle has a great influence on the wind pressure of the gable roof.The Realizable k-εturbulence model is used to numerically simulate two-dimensional scale model of a typical gable roof building.The influence of different slope angles on the wind pressure distribution and the changes in the aerodynamic coefficient on the roof are studied,and the changes of turbulence formation and separation in its convection field are also analyzed.The results show that the extreme suction at the ridge increases with the increase of the roof slope,while the extreme suction at the windward eaves decreases with the increase of the roof slope.Compared with the slope angle of 30°,the C P of the leeward surface of the 50°slope angle increased by 1.31 times,and when the slope angle was greater than 30°,the wind pressure near the leeward wall at 0.25 D away from the roof ridge increases sharply,where C P with an increase of about 50%every 10°.Then 30°is determined as the key angle affecting the wind pressure distribution of the gable roof.

关 键 词：双坡屋盖 平均风压 数值模拟 湍流模型 

分 类 号：TU312.1[建筑科学—结构工程]