开孔大跨屋盖结构的内部风效应研究  

Internal wind effect for long-span roof structure with openings

作　　者：余世策[1] 楼文娟[1] 孙炳楠[1] 杨仕超[2] 吴太成[2] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310027 [2]广东省建筑科学研究院,广东广州510500

出　　处：《浙江大学学报（工学版）》2005年第8期1206-1211,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50378085).

摘　　要：结合广州航空邮件处理中心风洞试验,研究了开孔大跨屋盖结构的内部风效应.分析了风致平均内压和脉动内压的特性及产生机理,给出了估算平均内压和脉动内压的理论方法,并对典型工况的平均内压进行了验算,试验结果与理论分析吻合较好.采用有限元时程分析方法对大跨网架进行了动力计算,探讨了墙面开孔对屋盖风振响应的影响.结果表明,墙面开孔会大幅增加屋盖的静动力风荷载,以风压指标的增幅来考虑开孔效应更具现实意义.Wind tunnel test of Guangzhou air-mail processing center was carried out to investigate the internal wind effect for long-span roof structure with openings. The characteristics and production mechanics of mean and fluctuating internal pressure were studied. Theoretical results of the mean and root-mean-square internal pressure coefficient agreed well with test results for typical work conditions. Finite element method was applied for time-history analysis of long-span grid structure, and the influence of windward openings on wind-induced dynamic response of long-span roof was analyzed. The results show that the openings on windward wall increase greatly the static-dynamic load on flexible roof; and that the increase of wind pressure index is more appropriate than wind load factor for evaluating the effect of windward openings on wind-induced dynamic response of long-span roof.

关 键 词：开孔 大跨屋盖 风致内压 风振系数 风压指标 

分 类 号：TU231[建筑科学—建筑设计及理论] TU312.1