Nonlinear analysis of steel structure in 3-D space considering the plate local buckling

This paper assembled 16-nodes relative degree shell elements into thin-wall elements sub-structure, which is used to considering the influence of local buckling on whole steel frame structures. The elements rigid matrix of 16-nodes relative degree shell elements is deduced considering the geometry and material nonlinear. The material non-linearity is modeled through the Von Mises yield criterion in conjunction with associated flow rule and Zeigler mixed hard model. The general approach to the solution of the problem is based on the finite-element method and iterate-incremental solution techniques. The compiled elastoplastic analysis program of 3-D steel structure based on the theory of this paper,which can be used to analyze the local buckling of any member's any intersection and joint panel zone shear-de formation of steel frame in three-dimension space,and can be used to analysis the stress development-of-elastoplastic distribution of 3-D steel structure. The computing efficiency and accuracy of theory for the steel frame local buckling analysis in the whole structures is illustrated from the benchmark example.