The Influence of the Material Properties on the Ultimate Behaviour of Aluminium H-shaped Beams

Rosario Montuori1, Elide Nastri2, Vincenzo Piluso2, *, Alessandro Pisapia2
1 Department of Pharmacy, University of Salerno, Fisciano, Italy
2 Department of Civil Engineering, University of Salerno, Fisciano, Italy

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© 2021 Montuori et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Civil Engineering, University of Salerno, Fisciano, Italy; E-mail:



In this paper, the influence of the Ramberg-Osgood exponent on the ultimate behaviour of the H-shaped (or I-shaped) aluminium beams subjected to non-uniform bending moment is investigated.


In particular, the results of a wide parametric analysis recently carried out by the authors are herein exploited to point out the influence of the material properties. The flange slenderness, the flange-to-web slenderness ratio, and the non-dimensional shear length, accounting for the moment gradient, are the main non-dimensional parameters governing the ultimate resistance and the rotation capacity of H-shaped aluminium beams.


The influence of these parameters was investigated considering four different materials covering both low yielding-high hardening alloys and high yielding-low hardening alloys, which are characterised by significant differences in the values of the Ramberg-Osgood exponent of the stress-strain constitutive law of the material.


Finally, empirical formulations for predicting the non-dimensional ultimate flexural strength and the plastic rotation capacity of H-section aluminium beams under moment gradient have been provided as a function of the Ramberg-Osgood exponent and all the above non-dimensional parameters.

Keywords: Aluminium alloys, Rotation capacity, H-shaped sections, FEM simulation, Empirical formulations, Local buckling.