开孔大跨屋盖结构的内部风效应研究

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。

Internal wind effect for long-span roof structure with openings

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.