低矮房屋屋面局部平均风压数值模拟与分析  

Numerical simulation and analysis of local mean wind pressure on the low-rise building roof

作　　者：戴益民[1] 闫旭光[1] 

机构地区：[1]湖南科技大学土木工程学院,湘潭411201

出　　处：《建筑结构》2014年第19期34-39,56,共7页Building Structure

基　　金：国家自然科学基金项目(51248001);交通运输部科技项目(2011318824140);湖南科技大学项目(E51257;J11216)

摘　　要：为获得低矮房屋屋面局部平均风压的分布规律,将体型比为1.5∶1∶1的低矮房屋屋面划分成若干典型区域并进行数值模拟研究。数值模拟结果与风洞试验结果对比表明,采用两种研究手段分析的结果吻合较好,从而验证了数值模拟技术在分析低矮房屋表面风压的可靠性。基于数值模拟,分析了七类不同屋面坡角低矮房屋在典型风向角下屋面局部区域平均风压的分布规律。结果表明:屋面局部平均风压随风向角改变而变化明显,且表现出一定的规律性;0°风向角下,靠山墙B,E区域形成局部高吸力区;60°风向角下,迎风屋檐A区及屋角J区测点平均风压系数随坡角的增大有明显递减趋势,屋脊C,D区测点平均风压系数随坡角的增大呈现出先增大后递减的趋势;90°风向角下,迎风屋檐A区及屋角J区各测点平均风压在45°坡角时均为正压。研究结果可为我国沿海多发台风地区低矮房屋的抗台风设计提供依据。A comprehensive study of local mean wind pressure on the roof of the low-rise buildings with a 1.5：1：1 body type was performed by means of numerical simulation technique based on the roof dividing several typical zones.Compared with wind tunnel tests,the results obtained from the simulation matched well.The reliability of the numerical simulation in analysis wind pressures of a low-rise building was verified.Based on numerical simulation,the distributions of local mean wind pressure on the roof for 7 roof pitches at different azimuths were studied.Analysis results show that the variations of local mean wind pressure along with azimuths show some regularity.Local high suction regions are formed in B and E zones at azimuth 0°.For the azimuth 60°,the mean wind pressure coefficients of A and J zones decrease with the increase of roof pitch.And the mean wind pressures coefficients of C and D zones also first increase and after decrease with the increases of roof pitch.The mean wind pressures of A and J zones are positive in 45° roof pitch at azimuth 90°.The research provides a foundation for the anti-typhoon design of low-rise buildings in the coastal typhoon-prone regions in China.

关 键 词：风工程 低矮房屋 平均风压系数 风洞试验 湍流模型 

分 类 号：TU312.1[建筑科学—结构工程]