高层结构群风压力分布与干扰效应  

Wind pressure distribution and interference effect on a tall building in group environment

作　　者：汪大洋[1] 张永山[1] 李庆祥[2] 袁玲[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广东省建筑科学研究院,广东广州510500

出　　处：《世界地震工程》2013年第1期27-33,共7页World Earthquake Engineering

基　　金：广东省自然科学基金项目(S20120400007215);中国博士后科学基金第52批项目(2012M521604);广东省教育厅科研项目(2012LYM-0104)

摘　　要：为研究群风环境中高层结构的风压分布特性与群风干扰效应,采用1:300缩尺刚性模型风洞试验,在24种风向角下分析了高层结构风荷载特性的群风效应,研究了结构的压分布特性与群风干扰效应。结果表明,现有《建筑结构荷载规范》的结构风压设计值不宜用于群风环境中高层结构抗风设计,而模型风洞试验可有效地反映群风环境中的结构风压特性;迎风面与背风面脉动压力系数较侧风面低,最大脉动压力出现在涡旋运动最强烈处,也是最大负压产生处;结构极值风压可以通过脉动风压的概率特性识别,进而对结构采取相应的加强措施。试验研究技术可靠,结果可用于该工程及类似工程的抗风设计参考。Wind pressure characteristics and interference effect of a high-rise building in group environment were investigated in detail by wind tunnel tests with 1：300 scale rigid model in 24 wind directions. Wind tunnel test was suggested to be adopted to implement reliable structural wind-resistant design in group environment so as to avoid some shortcomings of the ＂load code for the design of building structures＂ used nowadays.the resuls show that the fluctuating pressure coefficients on windward and lee sides are generally less than that on sidewind faces because of stronger vortex motion near the sidewind faces. The maximum fluctuating pressure appears where the strongest vortex motion and also the maximum negative pressure appear. Structural extreme wind pressure can be well identified by probabilitstic characteristics of fluctuating wind pressure and then corresponding structure-enhancing measures can be adopted.The technigue used in this paper is reliable and the results can be used as a reference to wind-resistant design of nuclear engineering and other similar projects.

关 键 词：高层结构 风洞试验 平均风压特性 脉动风压特性 群体建筑环境 

分 类 号：TU973.23[建筑科学—结构工程]