Cyclic behaviour of partly plastic pinned circular tubes: I. Analytical model

This paper is a presentation of an analytical model for the elastic-partly plastic behaviour of circular hollow steel struts subjected to static cycli c axial loading. The material follows a quasi-kinematic hardening hysteresi s path. The assumed shape of the elastic and permanent deformations of the axis of the strut satisfies the boundary conditions. Elastic deformation is derived including large deflection. The variation of parameters of partial plastic deformations of the yielded zone are determined by interpolation i n terms of those at mid-span, at the support and at two intermediate points along the partly plastic zone. The permanent deformations of the partly pl astic region about mid-span are computed and used to update the shape of th e unloaded strut. (C) 1999 Elsevier Science Ltd. All rights reserved.