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利用CQC算法,分析双层大跨网壳风振位移响应。分析表明:高阶模态贡献不可忽略;网壳位移响应可以分解为横向振动和竖向振动,利用模态广义位移协方差矩阵分析模态耦合效应,竖向振动模态耦合效应大,而横向振动模态效应较小,整体振动模态耦合效应不可忽略。绘出网壳上部节点位移风振系数等值图,风振系数分布不对称,最大值区域在跨度的1/3处。
The CQC algorithm is used to analyze the wind vibration displacement response of the double-decker large-span reticulated shell. The analysis shows that the contribution of high-order modes can not be neglected. The displacement response of latticed shell can be decomposed into horizontal vibration and vertical vibration. The mode coupling effect is analyzed by modal generalized displacement covariance matrix. The coupling effect of vertical vibration mode is large, while the lateral vibration mode State effect is small, the overall vibration mode coupling effect can not be ignored. Draw the equivalent displacement map of the wind-induced vibration coefficient of the upper node of the shell. The wind-induced vibration coefficient is asymmetric. The maximum value is 1/3 of the span.