Abstract
In this work, non-uniform steel members with or without initial geometrical or loading imperfections, that are loaded by axial forces applied concentrically or eccentrically and by concentrated moments applied at the ends or at intermediate points, are studied. More specifically, steel members with varying cross-sections, tapered or stepped or members consisting by two different tapered parts are considered. The formulation presented in this work is based on solving the governing equation of the problem through a numerical method where the eigenshapes of the member are employed. A failure plasticity criterion is introduced for members especially the short ones that will never reach the elastic critical buckling load. Although only the simply supported beam-column case is studied herein, it is obvious that the method can be extended to multi-span beams and frames, by employing the corresponding eigenshapes. Useful diagrams are presented for both the critical buckling loads and the equilibrium paths showing the influence of the main characteristics of the beam-column.
Highlights
The use of steel members with non-uniform crosssections either as columns or as distressed parts of a structure with or without bending moments is very common in steel constructions
1874-8368/12 non-uniform steel members with or without imperfections, loaded by axial forces and by concentrated moments applied at its ends or intermediate points are studied
In order to study the buckling behavior of steel members with non-uniform cross section, we will use members having at x=0 the characteristic properties given by the following Tables 1 and 2 which refer to IPE and HEB standard profiles, respectively, according to European Norms for characterization of standard steel sections
Summary
The use of steel members with non-uniform crosssections either as columns or as distressed parts of a structure with or without bending moments is very common in steel constructions. 1874-8368/12 non-uniform steel members with or without imperfections (of any form), loaded by axial forces (concentrically or eccentrically applied) and by concentrated moments applied at its ends or intermediate points are studied.
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