Stability Theories And Nonlinear Analysis Method Of Single-Layer Latticed Domes

Space latticed dome is a type of structural system whose major character is three-dimensional shape and three-dimensional loaded. The rationally loaded character, great stiffness, lightweight, low fabrication cost, novel and lively pattern, beauty and great expression art measuring are features of this type of structure. Therefore the latticed domes are widely used abroad and home.Total trend in development of latticed domes is that the span of latticed dome becomes more and more large, as well as the material used becomes more and more economic with the development of building materials, computer technique and structural theory. So, the stability is the key problem on the structural design of latticed domes. Only by the load-displacement nonlinear analysis during the whole process of the structure, the stability capability of the single-layer unite latticed domes can be estimated correctly. Therefore, based on the nonlinear whole process analysis of structure, the paper studies on the stability capability of latticed domes systematically and deeply.Based on FEM analysis software ANSYS, the nonlinear whole process analysis of stability behavior of single-layer latticed domes with different span and different ratio of rise to span and different section are carried out. The effect of the symmetrical load and unsymmetrical load and initial imperfection behavior of single-layer latticed domes with various parameters changes is also analyzed. A lot of stability regularities are found through the deduction and analysis of these obtained curves of whole course. At last, the empirical formula of load capacity of single-layer latticed domes is obtained through fitting. Some important conclusions are acquired and can be used to guide engineering design.