Study On The Non-linearity Stability Of Single-layer Spherical Lattice Shells

The stability behavior is the most important respect of the design of the spherical lattice shell (especial for single-layer spherical lattice shell). The stability of the lattice shell can be analyzed by load-displacement post buckling curve. Structure's load-displacement curve can display the whole stages of the strength stiffness and stability clearly. We can research other factors (such as initial shortage and load apply) having the influence on actual lattice shell's stability through the load-displacement curve.The non-linearity of lattice shell usually is divided into 2 respects: geometric non-linearity and material non-linearity. Because the computational thickness of single-layer spherical lattice shells much smaller than the span, the geometric non-linearity post buckling stable analysis of single-layer spherical lattice shell is mainly resolved in this paper.On the basis of various current non-linearity stable track method, this paper discusses the theory and methods of the non-linear post buckling analysis on lattice shell structure ,disserts the geometric nonlinear stiffness of the non-linear space beam element. This paper researches the stability of the single-layer spherical lattice shell by load-displacement post buckling analysis, discusses the post buckling analysis method of the lattice shell structure, disserts the computational model of the single-layer spherical lattice shell and the computational method of load-displacement post buckling track.The paper models and resolves the single-layer spherical lattice shell by ANSYS...a large-scale current finite element analytical program. The unstable state and the stability of the single-layer spherical lattice shell has been fully researched by analyzing the load-displacement curve of single-layer spherical lattice shell. Many stable factors having influence on the single-layer spherical lattice shell have been analyzed and concluded. Several main stable factors which have influence on single-layer spherical lattice shell have been pointed .The work of the paper have some meaning to the stability behavior and the design of single-layer spherical lattice shell.