在屋盖同步测压风洞实验的基础上,该文采用CQC法对沈阳综合体育馆大跨屋盖进行了较为准确的空间风振分析,重点分析了多个空间振型对屋盖有代表结点动位移根方差响应的贡献,得到该体育馆的最大参振振型为40阶;并连同SRSS方法一起,详细讨论了振型交叉项对动位移根方差响应的影响,对屋盖结构不同的结点和不同的参振振型,振型交叉项可使响应增加或减少,在考虑足够多的参振振型数以后,振型交叉项对动位移较大的结点影响很小。 On the basis of roof wind tunnel test, this paper uses CQC method to conduct a more accurate analysis of space wind vibration of long-span roof of Shenyang Gymnasium. The maximum vibration mode of the gymnasium is 40th order. Along with the SRSS method, the influence of the modal cross term on the variance response of the moving root is discussed in detail. For the different structure of the roof Nodes and different modes and mode shapes can increase or decrease the response. After considering enough number of modes, the modal cross term has little effect on the nodes with larger moving displacements.