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双层球面网壳是一种缺陷敏感型结构,影响结构稳定性的初始缺陷主要有杆件的初弯曲、杆件的残余应力和结构节点的初始安装偏差三种.本文首先利用有初始弯曲的杆件的平衡微分方程推导得到了杆单元的初始弯曲影响系数,利用CRC模型考虑了杆件残余应力的影响,并且利用有限元软件ANSYS的UPFs程序接口,开发了可以考虑残余应力和初始弯曲的杆单元;然后对原有仅能考虑节点安装偏差的随机缺陷模态法进行了改进和补充,最后提出了一种能够同时考虑三种缺陷的双层球面网壳的稳定分析方法.该法与一致缺陷模态法相比,具有更高的精度.
The double-layer spherical reticulated shell is a kind of defect-sensitive structure, and the initial defects that affect the structural stability are mainly the initial bending of the rod, the residual stress of the rod and the initial installation deviation of the structure node.In this paper, The initial bending influence coefficient of the rod element is deduced by using the equilibrium differential equation of the rod. The influence of the residual stress of the rod element is taken into account by using the CRC model. By using the UPFs program interface of the finite element software ANSYS, the influence of the residual stress and the initial bending Then, the stochastic defect modal method, which can only consider the installation deviation of the nodes, is improved and supplemented. Finally, a stable analytical method of double-layer spherical reticulated shells that can consider three defects simultaneously is proposed. Compared with the consistent defect mode method, with higher accuracy.