大跨度索-膜屋盖结构风振响应分析  

Wind-induced response analysis of a large-span cable-membrane roof

作　　者：罗俊杰[1,2] 韩大建[1,2] 

机构地区：[1]华南理工大学,广东广州510640 [2]亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《土木工程学报》2009年第10期15-21,共7页China Civil Engineering Journal

基　　金：国家科技支撑项目子课题(2006BAJ01B07-05)

摘　　要：大跨度索-膜屋盖是一种开敞的三维空间结构,要对之进行风荷载时程分析,为结构抗风设计提供相应的参数。此时,作用于结构的风荷载需要同时考虑来流向、横向和竖向脉动分量所引起的影响。首先介绍佛山世纪莲体育场索-膜屋盖结构的风洞试验情况和相应结果;然后利用考虑各方向间脉动分量空间相关性的谐波合成法模型来生成三向风荷载时程;最后对之进行动力特性分析,得到风振响应结果。在对结构各构件响应的结果处理后发现:风荷载在三个方向上的空间相关性不容忽视,由此所引起的结构响应,大于传统未考虑风荷载空间相关性的风振时程分析结果;另外,研究发现,该结构的各类构件在不同风向角下的响应风振系数变化不大,可以取相同值;但是,不同类型的响应风振系数会有一定差异,所以一般不能取统一的结构响应风振系数。Large-span cable-membrane roof is an open-space three-dimensional structure. Wind-induced time history analysis of the structure is necessary to provide proper response parameters for wind resistance design. At this juncture, three orthogonal turbulent components, which are the longitudinal wind, the lateral wind and the vertical wind should be taken into account. In this paper, a wind tunnel experiment and corresponding results of the cable-membrane roof of the Foshan Century Lotus Stadium are introduced. Then wind loads in the three directions are generated by using the Wave Superposition Method with correlations among the three wind components. Finally wind-induced responses of the structure are obtained by using time-history analysis. The results indicate that correlations of the three wind turbulent components cannot be negelected for a large-span structure, because the responses obtained from the proposed method are greater than those by the conventional methods. It is also found that the wind gust response factors for various structural components are similar to those gained by different wind actions with different wind direction angles. However, such response factors of different types of components are not identical to each other. That means, using a unique wind gust response factor for all responses is not reasonable for wind-resistant design of the cable-membrane structure.

关 键 词：大跨度结构 索-膜结构 时程分析 相干函数 响应风振系数 

分 类 号：TU318[建筑科学—结构工程] TU393.3