考虑多模态效应的双层柱面网壳风振响应计算

Calculation of wind-reduced vibration response of double-deck cylindrical latticed shell with multi-mode effect

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 wind vibration response of double-deck large span latticed shell was analyzed by using the random vibration frequency domain calculation methods. The results show that, the high-order mode contribution cannot be ignored, and the shell displacement response can break up into horizontal vibration and vertical vi- bration. The modal coupling effect was analyzed by using generalized modal displacement covariance matrix, and the results show that, the modal coupling effect occurs mainly in the vertical vibration, whereas the lateral vibration has smaller modal coupling effect, and the overall vibration modal coupling effects cannot be ignored. The contour diagram of wind vibration coefficient of upper joint displacement of the latticed shell was mapped, the wind vibration coefficient distribution is asymmetric, and the maximum value region is at the one-third of the span.