大跨屋盖风压场的本征正交分解与重构适应性研究  

Proper Orthogonal Decomposition and Reconstruction of Wind Field for Large-span Roofs

作　　者：李寿科[1] 李寿英[1] 陈政清[1] 黄韬[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2011年第6期20-26,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50708035)

摘　　要：对3类典型屋盖(封闭式方形平屋盖、封闭式曲面屋盖和开合式曲面屋盖)进行了刚性模型风洞测压试验,分析了典型风向角下的平均及脉动风压系数分布.利用POD方法对3类屋盖的风压场进行了分解,并对平屋盖风压场进行了POD重建.结果表明:斜风向封闭式平屋盖的POD分解性能最优,开合式曲面屋盖次之,封闭式曲面屋盖最差.3类屋盖的第1阶POD特征向量均反映平均风压系数分布,45°风向角下封闭式平屋盖的第2阶POD模态可以较好地反映锥形涡分量,而其他类型屋盖的高阶特征向量则反映风压场的局部分布.风压场的POD重建具有不平衡的性能,对于相同测点,模态数越多,其重建效果越好.对于不同测点相同模态数,测点脉动风压系数越大,其风压重建效果越好.Wind tunnel tests were carried out to measure the wind pressure on the closed flat roof,closed curved roof and retractable roof.The characteristics of mean and fluctuating wind pressure coefficients were particularly studied.The wind pressure fields of the roofs were decomposed in the proper orthogonal decomposition method,and the wind pressure field of flat roof was reconstructed.It has been shown that the performance of POD of oblique wind flat roof behaves best among all the three roofs,retractable roof is second,and closed curved roof is the worst;The overall distribution of mean wind pressure is reflected by the first dominant eigenvectors of POD.The POD reconstruction performance varies a lot among individual taps.The same taps have better performances for more eigenvectors.Different taps have better performances for higher variance taps.

关 键 词：风洞 封闭式平屋盖 封闭式曲面屋盖 开合式曲面屋盖 本征正交分解 

分 类 号：TU311.3[建筑科学—结构工程]