Global Interactive Buckling Behaviour of K6 Single-layer Spherical Reticulated Shells

Abstract:

Using finite element modelling， this paper investigates the buckling and post-buckling behavior of K6 single-layer spherical reticulated shells. Based on the proposed criterion to distinguish global buckling modes， the mechanism and load-carrying capacity reduction of global two-modal interaction is revealed from the perspective of deformation. The results show that the stability of K6 single-layer spherical reticulated shells is vulnerable to global interactive buckling， which may lead to significant load-carrying capacity reduction and unstable post-buckling behavior because of the deformation transition from first global eigenmode dominance at the buckling stage to global interactive mode dominance and second global eigenmode dominance at the initial and final post-buckling stages respectively. Imperfection amplitudes can affect the dominance of global interactive buckling for the ultimate behavior.

Key words:spatial structures;reticulated shells;finite element modelling;interactive buckling;nonlinear stability