Rigid-plastic finite element analysis of steel plates, structural girders and connections

摘要

The performance of three triangular plate elements for rigid-plastic finite element analysis of steel plates is evaluated. The element types considered are two variants of the constant stress triangle, the first one with no prescribed stress continuity at all and the second one with prescribed stress continuity in inter-element normal stresses. The third element type is an element with linearly varying stresses with complete inter-element stress continuity. The von Mise yield surface for steel plates is linearised, whereby the rigid-plastic analysis is formulated as a linearly constrained optimization problem, which is solved by a very effective internal point method.