Analysis On Stability Of Compounding Lattice Shell

The stability behavior is the most important respect of the design of the thin spherical lattice shell (especial for single-layer spherical lattice shell). The stability of the lattice shell can be analyzed by load-displacement whole buckling 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 compound spherical lattice shell is much smaller than the span, and the stress of spars is very small, the geometric non-linearity whole buckling stable analysis of compound spherical lattice shell is mainly resolved in this paper.The paper studies a kind of compound spherical lattice shell which is made of single-layer in center and double-layer around. It models and resolves the compound spherical lattice shell by ANSYS. It mainly extends in the following aspects: (1) The unstable state and the stability of the compound spherical lattice shell have been fully researched from initial to final stage; (2) It studies the merit of compound structure and their operating principle (3) It studies the stability sensibility to both node location deviation and the section of spar; (4) It studies the lawyer of buckling loads with double-layer area expansion and the thickness changing; (5) It studies the spherical lattice shell sensibility to support condition;(6) Several other stable factors which have influence on compound spherical lattice shell have been pointed.This research discovered: compared with the single-layer shell, compound spherical lattice shell have raised material strenuously and simplified the support. This research has some reference value for real design and building of this compound shell.