Study on the influence of geometric imperfections and welding deformation on the global stability of orthogonal mixed with oblique single-layer reticulated shell

Abstract

Using finite element method to study the influence of geometric imperfections and welding deformation on the global stability of orthogonal mixed with oblique single-layer reticulated shells. The initial imperfection values of different geometries and the effects of welding residual deformation on the global stability of the ultimate bearing capacity of the structure are compared, and the difference between the instability modes of the two kinds of reticulated shells in the structure is analysed. It is shown that the residual welding deformation almost has no impact on the ultimate bearing capacity of the structure, and the initial geometric imperfections with the first buckling mode have a more obvious effect on the stability of the shell. The rigidity of the orthogonal single-layer reticulated shell is greater than that of the oblique. The deformation of the oblique single-layer reticulated shell is always greater than that of the orthogonal shell in the middle of the shell span or the position of the support.