基于风洞试验的大跨航站楼屋盖风振响应分析

大跨屋盖结构对风荷载十分敏感,但尚无统一的规范计算方法。因此,对某机场航站楼进行了刚性模型测压风洞试验,得到大跨航站楼屋盖表面的平均、脉动风压系数。对其分布特性进行了研究,并讨论了周边建筑对结构表面风压分布的影响。对屋盖进行了风振响应时程分析,得到了脉动风荷载作用下此类大跨度屋盖在各个风向角的响应规律。结果表明,屋盖各区域的最不利风向角是各自的迎风角度;上游周边建筑对屋盖有遮挡效应,会减小屋盖表面的平均风压;屋盖开洞周边的风振响应较大;为该类结构抗风设计提供了参考。

Wind-induced vibration response analysis for long-span terminal roof based on wind tunnel test

Long-span roof structure is very sensitive to wind load, but there is no uniform calculation method. So for an airport terminal project, a rigid model wind tunnel test was implemented. The test results of the mean and fluctuating wind pressure coefficients of the long-span terminal roof is presented, the characteristics of the wind pressure distributions are studied, and the influence of the surrounding buildings is discussed. Time history analysis is performed and the rule of the wind-induced vibration response in different wind angles is studied. The results imply that the most disadvantageous wind angle for each roof part is the corresponding windward angle. It is confirmed that the upstream surrounding buildings have shielding effect on the terminal roof, reducing the mean wind pressure. In addition, the wind vibration response of the areas around the opening is larger than the other areas. The conclusions can be taken as a reference for the wind-resistant design of similar structures.