大跨开合屋盖风荷载与风致响应试验与数值计算研究

Investigation on wind load and wind-induced response of the large-span retractable roof based on experiment and numerical calculation

为研究屋盖开孔对大跨结构风效应的影响,在边界层风洞中开展了大跨开合屋盖刚性模型风洞测压试验,分析了结构表面风荷载分布特征,基于时域分析法研究了屋盖开合对风致响应的影响。结果表明:大跨结构模态密集,第一阶模态能量最大,高阶成分的贡献不容忽视;屋盖开洞能有效的减小屋面风荷载,降低位移响应与加速度响应,减小风振系数。研究结果可为大跨开合屋盖风荷载设计提供参考。

To study the effect of roof opening on wind effect of large-span roof structure,wind tunnel tests on a large-span retractable roof were carried out in a boundary layer wind tunnel,then the characteristics of wind loads on the roof were studied,and the wind-induced responses influenced by the opening were investigated in time domain.The results induct that the models for the large-span structure are concentrated,the largest modal energy occurred in first model,and the contributions from higher order are not ignored.The wind loads reduced when the roof with opening,the same tendency was found for wind induced displacement response and acceleration response.The output will be a reference for wind load design of large-span retractable roof.