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利用ANSYS有限元软件建立了半刚性节点单元模型,对四边支承单层柱面网壳进行了几何非线性全过程分析,主要考察考虑初始几何缺陷和荷载不对称分布情况下,节点刚度变化对柱面网壳稳定性的影响规律.研究结果表明,四边支承单层柱面网壳当缺陷相同时,刚度减弱,极限荷载下降,且抗弯刚度的影响较强;缺陷增大,扭转刚度对四边支承柱面网壳的影响增强;同一刚度下,随着缺陷的扩大,极限荷载呈下降趋势,随着刚度的减小,缺陷对网壳极限荷载的影响程度减弱;荷载不对称分布导致四边支承柱面网壳结构极限荷载降低至对称荷载作用情况的80%左右,缺陷变化使得节点刚度对极限荷载的影响程度有所改变,但对承载力终值影响不大.
The finite element software ANSYS is used to establish the semi-rigid node element model. The geometrically nonlinear whole-process analysis of the single-layer cylindrical reticulated shell with four sides is carried out. The main consideration is that considering the initial geometric defects and asymmetric load distribution, The results show that the stiffness of single-layer cylindrical reticulated shell with four-sided support is reduced, the ultimate load is decreased, and the influence of bending stiffness is strong. The defects increase and the torsional stiffness of four-sided Under the same stiffness, the ultimate load declines with the increase of the defect. With the decrease of the stiffness, the influence of the defect on the ultimate load of the reticulated shell decreases. The unbalanced load distribution leads to the four-sided support The ultimate load of cylindrical reticulated shell structure decreases to about 80% of that of symmetrical load. The change of defect makes the influence of node stiffness to ultimate load changed, but it has little effect on the final bearing capacity.