长沙星城光塔风荷载特性试验

Experimental Study on the Wind Load Characteristics of Changsha Light Tower

对设有多种气动措施的高层建筑进行刚性模型测压风洞试验,采用模态叠加法计算该建筑在风荷载作用下的响应,得到与主体结构设计风荷载相关的风振系数和整体体型系数,以及围护结构的设计风荷载.结果表明:该建筑的风振系数试验值比规范值大,但结构形式较为有利,整体体型系数最大值为1.04;围护结构设计风荷载的最大正极值风压出现在建筑顶部透风幕墙处,而最大负极值风压出现在凹角区域.从加速度响应来看,该建筑的振动以横风向振动为主.

A rigid model pressure measurement wind tunnel test is carried out on a high-rise building with multiple aerodynamic measures.The modal superposition method is used to calculate the response of the building under wind load.The dynamic response factor and the comprehensive shape coefficient,which is related to the main structure design wind load,and the design wind load of the retaining structure are derived.Results show that the dynamic response factor educed from the test is larger than the code value,but the structure shape is advisable,with a maximum comprehensive shape coefficient is 1.04.On the ventilated curtain wall assigned at the top of the building,there is the ultimate positive peak wind pressure for the design wind load of retaining structure,while the ultimate negative peak wind pressure occurs in the corner recession area.The acceleration response turns out that the vibration of the building is dominated by cross-wind vibration.