建筑结构学报2011，Vol.32Issue(4)：9-16,8.
罩棚式低矮房屋屋面风荷载特性及气动抗风措施研究
Study on wind loads on flat roof of canopied low-rise building and aerodynamic strategy for wind load reduction
摘要
Abstract
The distributions of mean wind pressure and extreme wind pressure on flat roof of rectangular and circular canopy structure models were investigated in a boundary layer wind tunnel.The mechanism of wind-induced damages of the canopy roof was analyzed.Generally, the cladding design of those canopy structures is dominated by suction wind pressures.The results show that the maximum mean negative pressure coefficients on the rectangular and circular canopy reach -1.83 and -0.97, respectively, and the maximum peak negative pressure coefficients are found to be -5.41 and -3.11 which are much more than the values proposed by the gust factor approach of GB 50009.This indicates that the gust factor approach is not suitable for the calculation of roof pressure on the envelope structures.According to the characteristics of wind loads on the canopy, several aerodynamic strategies to reduce the maximum suction wind pressure at wind sensitive locations on the canopy by venting the leading edges and chamfering the roof edge were recommended.The experimental results show that the suggested strategies can make a reduction of 25％ ～ 35％ wind load on the roof s sensitive locations.Based on the analysis results, the local shape factors for the rectangular and circular canopy structures were recommended.关键词
罩棚式屋面/风荷载/风洞试验/平均风压/极值风压Key words
canopied low-rise building/ wind load/ wind tunnel test/ mean wind pressure/ extreme wind pressure分类
建筑与水利引用本文复制引用
刘帅,谢壮宁,石碧青..罩棚式低矮房屋屋面风荷载特性及气动抗风措施研究[J].建筑结构学报,2011,32(4):9-16,8.基金项目
国家自然科学基金项目(50778108),国家科技支撑计划项目(2006BAJ06B05-3). （50778108）
