A local-global fe model for non-linear analysis of column-supported shells of revolution

摘要

A local-global finite element model suitable for the analysis of column-supported shells of revolution is presented. The model combines, in a single analysis, axisymmetric shell elements, general shell elements, and column elements. Axisymmetric or rotational shell elements which can accomodate geometric nonlinearities are employed in the axisymmetric portion of the shell. In this region, the nonaxisymmetric behavior in loading and deformation is accounted for by including appropriate Fourier harmonics. The column-supported area is mdoeled using individual column elements. The local zone is identified as the region consisting of the column elements and the physically and geometrically nonlinear general shell elements inserted between the column-support area and the axisymmetric shell portion. In addition, any deviation from the axisymmetric geometry of the shell, such as imperfections or cut-outs, can be easily included in the local zone. Example which illustrate the proposed procedure are presented.