基于POD方法的高层建筑表面脉动风压场分解与重构  

Decomposition and reconstruction of fluctuating wind pressure fields on high-rise buildings based on POD method

作　　者：单文姗 杨庆山[1,2] 田村幸雄 金容徹 SHAN Wenshan;YANG Qingshan;TAMURA Yukio;KIM Youg Chul(School of Civil Engineering,Chongqing University,Chongqing 400044,China;Chongqing Key Laboratory of Wind Engineering and Wind Energy Utilization,Chongqing 400045,China;Department of Architecture,Tokyo Polytechnic University,Atsugi 243-0297,Japan)

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]风工程与风资源利用重庆市重点实验室,重庆400045 [3]东京工艺大学建筑学部,日本厚木243-0297

出　　处：《建筑结构学报》2023年第5期47-57,共11页Journal of Building Structures

基　　金：高等学校学科创新引智计划(B13002,B18062);国家自然科学基金项目(51720105005)。

摘　　要：对于风敏感建筑,其表面风压、风力场重构与预测在主体结构风致响应计算和围护结构风荷载设计时具有重要作用。为此,基于刚性模型测压风洞试验,采用本征正交分解(proper orthogonal decompositions,POD)方法,研究了方形截面高层建筑表面风压场在开阔和城市两种地貌下的作用机理及风压、风力重构与风压预测过程。通过分析主坐标和原始广义力的频谱特性并对比二者相关特性,定量分析了前三阶特征模态分别与顺、横风向广义风力的确定性联系。研究表明:在重构风压、风力时,可以采用低阶主坐标重构时程的均方值占试验时程均方值的占比确定参与重构的模态;重构所得点风压、层间风力和广义风力达到同样精度时参与模态数不断降低,且重构所得顺、横风向广义风力仅需单一主导模态参与;采用部分测点脉动风压对驻点高度典型风压进行预测,与测压试验时程、均方根和功率谱对比发现,预测精度较高。Reconstruction and prediction of wind pressure/force on wind sensitive buildings are very important to the wind-induced response calculation of the main structure and the wind loading design of the cladding structure.Based on the high-frequency pressure measurement of rigid models in the wind tunnel,the certain mechanism and wind pressure/force reconstruction process of the surface wind pressure field on square-section high-rise buildings in both open and urban terrains were studied by using the proper orthogonal decomposition(POD)method.By analyzing the spectral characteristics and correlation between principal coordinates and original generalized forces,the relationship between each dominant eigenmode and main physical mechanism was established.Then,it is clarified that the dominant eigenmode participating in the reconstruction process should be extracted in the variance proportion of the reconstructed time history and the measured time history when reconstructing wind pressure/force.The reconstructed wind pressure,local wind force and generalized wind force based on the dominant eigenmodes are discussed,and the involving mode number increases accordingly for reaching the same reconstructed accuracy.At last,the wind pressures at the stagnation point layer are predicted by reduced dimensional wind pressure fields,and the predicted results match well with the measured wind pressures.

关 键 词：高层建筑 脉动风压场 本征正交分解 风洞试验 风压场重构 风压预测 

分 类 号：TU973.213[建筑科学—结构工程]