大跨度结构风荷载的风洞试验和CFD数值模拟研究  

WIND TUNNEL TEST AND CFD NUMERICAL SIMULATION OF WIND-INDUCED LOADS ON BIG SPAN STRUCTURES

作　　者：许伟[1] 黄啟明[1] 李庆祥[1] 杨仕超[1] 

机构地区：[1]广东省建筑科学研究院,广州510500

出　　处：《工业建筑》2009年第S1期394-398,401,共6页Industrial Construction

摘　　要：针对某大跨度结构,进行动态测压风洞试验和风荷载数值模拟研究。通过风洞试验,给出了该大跨度体育馆屋面及四周立面表面的风压系数,并分析了风压分布的特征,为该工程的主体和围护结构抗风设计提供详细的风荷载数据。通过数值模拟研究,探讨复杂体型建筑表面平均风压CFD数值模拟的可行性,提出了应用于复杂工程CFD数值模拟时的网格划分方法,有效地减少了多个风向角时的建模工作量。计算结果表明,体育馆表面的风压与风洞试验结果基本一致;在局部区域存在较大误差。最后比较了网格密度、湍流模型对数值计算精度的影响。CFD数值模拟简洁、高效,能获得丰富的数据成果,可以用于复杂工程的平均风荷载研究。Wind tunnel test and CFD numerical simulation of wind-induced loads have been performed on a big-span structure.Mean pressure coefficient on the roof and the side faces were gained in the test,which provided detail data on wind-resistant design of the main and the surrounding structures.Also,the features of the wind pressure distribution on the surfaces were anlysized.Meanwhile,the wind load distribution on the surfaces of this project has been numerically simulated.A mesh generation method for complex projects has been put forward,which could reduced the workload effectively for simulation model creation with many different wind directions.Compared with the wind tunnel test,the computational results have good agreement with experimental data,while a little bigger error exists in some zone locally.Finally,the effects of grid density and turbulence model on numerical accuracy were analyzed.It indicates that the numerical simulation technique can predict the mean wind pressure distribution on complex projects for practical purpose.

关 键 词：风洞试验 数值模拟 平均风压系数 复杂工程 

分 类 号：TU312.1[建筑科学—结构工程]