Approaches to the Improvement of the Applicability of the Idealized Structural Unit Method for Collapse Analysis of Plate Structures

摘要

The Idealized Structural Unit Method (ISUM) is a simplified matrix method for the collapse analysis of large structures. The geometrical and the material nonlinearities are included inside the newest ISUM element formulation. In this paper, possible modifications of the special shape functions especially for high plate slenderness ratios will be discussed. To embed ISUM in a commercial finite element software package the degrees of freedom have to be reduced to nodal degrees of freedom. Therefore the internal degrees of freedom are condensed out before the iterative solution of governing equations starts. The applicability and accuracy of the condensation procedure is presented.