大跨度膜结构风压分布的风洞试验和数值模拟

Wind Tunnel Experiment and Numerical Simulation of Wind Pressure Distribution of Large-Span Membrane Structure

为确定浙江工商大学体育场屋盖结构的风压分布,进行风洞试验研究,并采用数值模拟方法进行了对比分析.采用缩尺比为1∶200的有机玻璃模型,在建筑串联回流式风洞中的大试验段进行了风洞试验,测得对应24个方向角的结构表面各点风压系数,采用标准k-ε,重正化群k-ε,可实现的k-ε和RSM四种湍流模型对屋面风压系数进行了数值模拟,将模拟结果与风洞试验数据进行了比较.结果表明,这种月牙形屋面的风压分布主要以吸力为主,迎风边缘及突出部位的风压系数较大,而在低凹处及尾流区域较小.数值模拟结果与风洞试验结果基本吻合,采用的四种湍流模型结果差异不明显.

To determinate the wind loads on the roof structure of stadium in Zhejiang Industry and Commerce University,the wind tunnel experiment is carried out and the numerical simulation of wind pressure is completed for comparison.The organic class model with aspect ratio of 1∶200 is made and located at the big section of the architectural regurgitant tunnel.Through the tunnel experiment the wind pressure coefficient of every measure point is obtained when the wind blow along 24 different orientations.The wind pressures on the roof are simulated using four turbulence models,standard k-ε,renormalization group k-ε,realizable k-ε and reynolds stress model（RSM）,and the comparison with the wind tunnel experimental results is archived.The results show that the wind loads on the roof structure are mainly suctions,and the coefficients on wind ward sides and projecting locations are big while the coefficients on the end of wind stream and concave locations are small.The results of numerical simulation are consistent with those of tunnel experiment and the differences among the results of four turbulence models are not notable.