大跨网架屋面建筑结构的风致振动.pdf

兰州大学学报: 自然科学版, 2016, 52(6) / 12 月 Journal of Lanzhou University ：Natural Sciences，2016 ，52(6) / December 大跨网架屋面建筑结构的风致振动 1 2 2 李 琛 , 杨 赐 , 李 宇 1. 长安大学 建筑学院, 西安 710064 2. 长安大学 公路学院, 旧桥检测与加固技术交通行业重点试验室, 西安 710064 摘 要：依托某工程实例, 通过风洞试验测得结构的风压系数时程, 利用ANSYS 参数化设计语言编 制了能够精确求解大跨柔性网架屋面的风振系数及等效静风荷载的程序, 将风压系数时程转化为相 应的面荷载向量并加载至有限元模型, 研究了大跨柔性网架屋面结构的风致振动. 结果表明, 60° 、 180°和270°为大跨网架屋面结构的最不利风向角, 应注意这几个风向角的抗风设计. 大跨网架屋面 的四周屋檐和两条相互垂直的中线,都是风致振动较大的位置, 应采取抗风加固措施. 关键词：大跨柔性网架; 风洞试验; 风致振动; 有限元 中图分类号：U442.5 文献标识码：A 文章编号: 0455-2059(2016)06-0838-06 DOI: 10.13885/j.issn.0455-2059.2016.06.018 Wind-induced vibration for long-span truss roof 1 2 2 Li Chen , Yang Ci , Li Yu 1. School of Architecture, Changan University, Xian 710064, China; 2. Key Laboratory of Ministry of Communications for Bridge Detection and Reinforcement Technology, School of Highway, Changan University, Xian 710064, China Abstract: Based on one engineering example, a wind tunnel test was carried out to obtain the wind pres- sure time-history curves. And ANSYS parametric design language was also used to compile one program to calculate the wind-induced vibration coefficients and static wind equivalent load. Thus, wind pressure could be converted into area load that was applied in finite element analysis model to study wind-induced vibration of a long-span truss roof. The following conclusions have been obtained: 60°, 180° and 270° are the worst wind attack angles attention to which should be paid to in a wind-resistant design. Great wind-in- duced vibration mostly occurs in the eave and two perpendicular midcourt lines which should be reinforced. Key words: long-span flexible rack; wind tunnel test