济南奥体馆屋盖结构风振响应和等效静力风荷载

Wind-induced response and equivalent static wind load for suspended dome roof structure of Jinan Olympic Sports Hall

在模态加速度法和荷载-响应相关法基础上,推导出结构脉动风总响应的实际理论组合公式,首次提出用于补偿背景和共振分量之间耦合项的一致耦合方法(CCM)来求解结构的风致响应,并严格推导出各分量相应的等效静风荷载。将该方法应用于中国最大跨度弦支穹顶屋盖结构——济南奥体馆,通过同步测压试验确定表面风荷载,对其自振特性、风振响应、振型间的耦合项、位移风振系数,以及背景、共振和交叉项的等效静风荷载分布规律进行了研究。结果表明:风振响应呈现显著的多模态耦合、多振型响应特征;背景和共振分量之间的交叉项影响不能忽略、共振分量相比背景和交叉项分量起主导作用;CCM方法可作为此类结构风振精细化分析的有效方法。

The theoretical combination formulas of fluctuating win＆induced structural responses were derived based on mode acceralation and load-response correlation. The consistent coupling method （CCM） for analyzing wind-induced structural re- sponses was firstly presented to compensate the coupling components between background and resonance modes and the equiva- lent static wind load corresponding to these components was rigorously deduced. The method was employed to analyze wind-in- duced responses for suspended dome roof structure of Jinan Olympic Sports Hall with the largest span in China. Simultaneous pressure measurements in wind tunnel were done to obtain fluctuating wind loads on the building surface. Main characteristics of wind-induced response of the structure were analyzed, including structural natural frequency, power spectrum of win＆in- duced response, modal participation in the response, coupling effects among modes, and equivalent static wind load distribution rule of background, resonance and their cross components. Results show that there exist apparent characteristics with multi- modal coupling and response in wind-induced responses. The cross effects between background and resonance components can＇ t be ignored and resonant component has more contribution to wind-induced response. CCM can be used as a kind of fine and effective method for analyzing wind-induced responses of such structure.