Abstract

In this paper, the results of an extensive numerical analysis devoted to the evaluation of the inelastic behaviour of the I-shaped aluminium alloy beams are presented. By using a numerical model implemented in the implicit FEM code ABAQUS/Standard and largely calibrated against experimental tests, the main geometrical and mechanical parameters influencing the rotational capacity of I-beams subject to non-uniform bending are investigated. The study outlines the important role of the material hardening that, in addition to the local slenderness of compressed elements, has a strong influence on both moment capacity and ductility of the member. Moreover, it has been shown that, if interactive buckling phenomena are avoided, the influence of the other parameters (namely flange-to-web slenderness ratio, moment gradient, web slenderness and sectional area ratio) on the stable part of rotational capacity is of a secondary importance.

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