下击暴流作用下低矮双坡建筑表面风压特性研究  

Study on Wind Pressure Characteristics of Low-rise Gable-roof Buildings Under Downburst

作　　者：吉柏锋[1] 邱鹏辉 柳广义 瞿伟廉[1] JI Baifeng;QIU Penghui;LIU Guangyi;QU Weilian(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]重庆大学土木工程学院,重庆400045

出　　处：《应用基础与工程科学学报》2023年第4期865-875,共11页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51308430);湖北省自然科学基金项目(2020CFB524)。

摘　　要：为研究下击暴流对低矮双坡建筑的影响,基于计算流体动力学方法模拟了下击暴流作用下低矮双坡建筑表面风压,分析了两种典型屋面坡角和湍流模型对下击暴流作用下低矮双坡建筑物的表面风压特性的影响.结果表明:下击暴流作用下,小坡角(16°)时迎风面上边缘的负压梯度较大,两侧屋面受到负压作用,大坡角(35°)时屋脊处的负压较大且更加集中,迎风面侧和背风侧屋面分别呈现正压分布和负压分布;在采用标准壁面函数处理近壁面粘性区域时,不同湍流模型的低矮双坡建筑风压分布的差别主要体现在迎风面、屋脊处以及两侧屋盖面上下边缘,剪切应力运输湍流模型更适合于模拟下击暴流作用下大坡角低矮双坡建筑物屋脊处风压以及处理小坡角低矮双坡建筑物沿来流方向屋面上下两边缘棱角处的强分离流动问题.To study the downburst impact on low-rise gable-roof buildings,the wind pressure of low-rise gable-roof buildings under downburst was simulated based on computational fluid dynamics,and the effects of two typical roof slope angles and turbulence models on wind pressure characteristics of low-rise gable-roof buildings were analyzed.The results indicate that the negative pressure gradient on the upper edge of the windward surface is relatively higher and the roofs on both sides are subjected to negative pressure when the slope angle is small(16°).When the slope angle is large(35°),the negative pressure at the roof ridge is relatively larger and more concentrated while the roofs close to the windward side and the leeward side are subjected to positive pressure and negative pressure respectively;When the standard wall function is used to process the viscous influence area of the near wall,the differences of the wind pressure distribution of low-rise gable-roof buildings obtained by different turbulence models are mainly reflected in the windward surface,the roof ridge and near the upper and lower edges of the roofs on both sides.Shear stress transport turbulence model is more suitable for simulating the wind pressure at the ridge of low-rise gable-roof building with large slope angle under downburst,and dealing with the strong separation flow at the corners of the upper and lower edges of the roofs of low-rise gable-roof building with small slope angle along the direction of incoming flow.

关 键 词：下击暴流 低矮建筑 双坡屋面 风压系数 湍流模型 计算流体动力学 

分 类 号：TU312.1[建筑科学—结构工程]