Stability Analysis Of A Large Span Single - Layer Aluminum Alloy Reticulated Roof

Large span single layer reticulated shell roof structure is widely used in large-scale single building, such a structure has a strong geometric nonlinearity, stability issues outstanding. High strength aluminum alloy material is a low modulus of elasticity, it will be applied to large span single layer latticed shell, the material nonlinearity may come out, and therefore it is necessary to discuss them more stable issues. This paper mainly aluminum greatly span single layer lattice stability study made the following points:1) The load distribution on its stability; 2) study the advisability of the separator for a separate analysis of the network shell. To these two points there is a clear understanding of the article actual project-a swimming fencing hall roof made the following specific tasks:1、To establish the actual project corresponding finite element model, and remove the spacer type model based on the actual constraints of the network shell structure and the overall structure of the eigenvalues do four load cases Distribution buckling analysis, they found four types of load cases By characteristic value of the coefficient difference is not large, the buckling load distribution in the form of not particularly sensitive, and found a central location regardless of the kind of load distribution buckling load distribution are from the beginning, with the buckling modes of increasing the diffusion to both sides open.2、Taken in isolation body and the overall structure of the same load, static analysis, modal analysis and elasticity eigenvalue buckling analysis, knowing the same weaknesses in both cases, are supporting steel columns around, possible compressionThey are big parts of the same cross-network shell intermediate portion, and the separator and the overall structure of the characteristic value of the coefficient is not very different, the same bent position.3、Spacer double nonlinearity (nonlinear material and geometric nonlinear) analysis, taking maximum points extracted displacement load-displacement curve analysis, in order to assess the performance of the large span stable aluminum shell single network.