A Triangular Finite Element for the Study of the Post-Critical Behaviour of Shells

摘要

The numerical solution of the limit analysis problem has experienced a growing interestrnin recent years. Methods developed in this context can be employed also to obtainrnindications on the structural response subsequent to collapse, which is required in severalrnsituations, such as for shells employed as shock absorbers or energy dissipators.rnThe procedure is known as sequential limit analysis and, as its name suggests, is basedrnon a sequence of limit analysis solutions referring to progressively updated conu0002gurations.rnIn this paper, the limit analysis procedure proposed in [6] is employed to thisrnpurpose in conjunction with the TRIC shell element developed by Argyris and coworkersrnin [16], which is modiu0002ed to some extent to adapt to the rigid-plastic context.rnSome examples show the effectiveness and the accuracy of the method, which comparesrnwell with results obtained from complete, although computationally demanding,rnincremental elastic-plastic approaches.