大跨平屋盖风致破坏开口附近的风压变化  

Analysis on Wind-induced Damage of Long-span Roof Structures

作　　者：田玉基[1] 杨娜[1] 杨阳[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《武汉理工大学学报》2012年第6期109-113,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(90815021;50938008;50978025);中央高校基本科研业务费专项资金(2010JBZ011;2012JBM007)

摘　　要：利用计算流体动力学(CFD)软件CFX11.0,采用基于雷诺平均(RANS)方法的SSTk-ω湍流模型对大跨度平屋盖风致破坏过程进行了二维数值模拟,研究了风致连续破坏过程中屋盖开口附近风压系数的变化规律。结果表明,大跨度屋盖迎风边缘部位的风吸力最大,屋盖的风致破坏往往由这些部位开始。屋盖破坏过程中破坏开口边缘处风压发生较大变化,这是屋盖风致连续破坏的主要原因。此外,结构前后入口的大小也对破坏开口外表面风压系数分布规律有较大影响。文中定性地对屋盖结构风致破坏过程进行了数值模拟分析,可为大跨度屋盖局部抗风设计提供参考。Using the SST k--w turbulence model, the numerical simulation of wind-induced continuous damage of a 2D long-span roof structure is conducted by CFX11. 0 to investigate the external and internal wind pressure coefficients near the opening hole. It is demonstrated that the wind-induced suctions at the upstream eaves and the corners are much larger and that the damage of the roof arises from these locations. During the failure process of the components, the wind pres- sure coefficients near the opening hole change dramatically while this is the main cause of the wind-induced continuous failure of the roof. In addition, the sizes of the entrances also influence the wind pressure coefficients on the upper surface of the roof. This research provides a qualitative reference of the win-resistant design for the cladding loads of a long-span structure.

关 键 词：大跨度屋盖 风致破坏 平均风压系数 计算流体动力学 数值模拟 

分 类 号：TU312.1[建筑科学—结构工程]