“四肢伸展型”大跨屋盖风致响应分析

摘要

Based on data of wind pressure measurement in wind tunnel test for its rigid model, the wind-induced responses of Shenzhen airport Terminal 3 ( T3 ) structurally similar to an extensional large roof were calculated with the CQC method, and then the characteristic of equivalent static wind load distributions was also discussed. The results showed that the aerodynamic interferences among different parts of an extensional large roof are very fierce and complex, they may increase the wind loads on the whole structure, so the displacements not only at the cantilever edge of the roof but also in its middle parts are needed to be paid attention when the structure is designed; the static part of the total wind-induced responses are dominant, however the resonant responses are usually bigger than the background responses in the dynamic response part. All the conclusions could provide some useful references for designing an extensional large roof structurally similar to T3 of Shenzhen airport.%基于刚性模型风洞测压试验结果,对深圳机场T3航站楼这一“四肢伸展型”大跨屋盖结构采用平稳激励下随机振动模态叠加法(CQC法)进行计算,分析了结构风致响应,并讨论了等效静力风荷载的分布特性.计算结果表明,“四肢伸展型”大跨屋盖各部分之间的气动干扰效应非常强烈且相当复杂,将增大整体结构上的风荷载；抗风设计时,不仅要注意屋盖边缘悬臂处的位移,还要关注结构中部的节点位移；风致响应以静力响应为主,但动力响应中,共振响应一般大于背景响应.以上分析可为类似大跨屋盖结构的抗风设计提供一定的参考.