大跨裙摆屋盖脉动风荷载特性数值模拟研究  

Numerical simulation study on fluctuating wind load characteristics of long-span skirted roof

作　　者：王辉[1,2] 张鑫[1] 胡正生 郑吉丰 王静峰 Wang Hui;ZhangXin;Hu Zhengsheng;Zheng Jifeng;Wang Jingfeng(School of Civil and Hydraulic Engineering,Hefei University of Technology,230009,Hefei,China;State Key Laboratory of Subtroptical Building Science,South China University of Technology,510640,Guangzhou,China;China Construction Third Engineering Bureau Co.,Ltd.,430000 Wuhan,China;Anhui Advanced Steel Structural Technology and Industrialization Collaborative Innovation Center,230009,Hefei,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [3]中建三局第二建设工程有限责任公司,武汉430000 [4]安徽先进钢结构技术与产业化协同创新中心,合肥230009

出　　处：《应用力学学报》2020年第5期1965-1971,I0009,共8页Chinese Journal of Applied Mechanics

基　　金：亚热带建筑科学国家重点实验室开放课题(2020ZB24);教育部新世纪优秀人才支持计划(2013JYXR0010);企业委托项目(W2017JSKF0154)。

摘　　要：以苏州太平金融中心大跨裙摆屋盖为对象,采用LES大涡模拟方法,模拟并分析屋盖表面脉动风压分布特性、脉动风压谱,以及脉动风压空间相干性等。结果表明:屋盖风压能量集中于迎风状态的低频部分,屋盖主体与主楼连接位置的角部区域在锥形涡的作用下会出现脉动风压增大现象;测点间脉动风压相干性随着频率及测点间空间距离的增大而减小,在高频处,其相干函数衰减到0.2以下,可近似认为不相干。The structural failure of the long-span roof is easily caused by the fluctuating wind loads, and research on the wind load distribution and fluctuating characteristics is a critical basis for wind-resistant design. Taking the long span skirted roof of Suzhou Taiping Financial Center as the engineering background, this paper uses the large eddy simulation(LES) method to simulate and analyze the distribution of fluctuating wind pressure on the roof surface, the power spectral density of fluctuating wind pressure, and the spatial coherence of the fluctuating wind pressure. The simulation results suggest that the wind pressure energy of the roof concentrates in the low frequency part of the windward state, and the corner area of the connection between the main body of the roof and the main building may increase the fluctuating wind pressure under the action of the conical vortex. The coherence of the fluctuating wind pressure between the measuring points decreases with the increase of the frequency and the distance between the measuring points. At high frequencies, the coherence function is attenuated to below 0.2 and can be considered as irrelevant.

关 键 词：大跨屋盖 大涡模拟 脉动风压 功率谱 相干性 

分 类 号：TU312.1[建筑科学—结构工程] V211.3[航空宇航科学与技术—航空宇航推进理论与工程]