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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 75
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar
Paper 27
Inelastic Behaviour of I-Shaped Aluminium Beams G. De Matteis+, R. Landolfo*, M. Manganiello* and F.M. Mazzolani+
+Department of Structural Analysis and Design, University of Naples Federico II, Naples, Italy
Full Bibliographic Reference for this paper
G. De Matteis, R. Landolfo, M. Manganiello, F.M. Mazzolani, "Inelastic Behaviour of I-Shaped Aluminium Beams", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 27, 2002. doi:10.4203/ccp.75.27
Keywords: aluminium alloys, rotational capacity, cross-sectional classification, local slenderness, strain hardening, local buckling.
Summary
The rotational capacity is one of the most important parameters characterising the
inelastic behaviour of metallic members. In particular, it is required when inelastic
calculation methods are employed, allowing for the development of complete plastic
mechanisms of the whole structure. Besides, high rotational capacity is required
when plastic strain-concentration occurs as well as when a high-energy dissipation
capability of the structure is necessary. The evaluation of rotational capacity has
been extensively studied, especially in the field of steel structures. On the basis of
such studies, modern design codes provide simplified rules for assessing the
capability of cross sections to behave inelastically. Classification systems for cross
sections are therefore proposed, based upon fixing suitable slenderness limits for
plate elements composing the cross-section. In particular, the width-to-thickness
ratio
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Aiming at improved knowledge of inelastic behaviour of aluminium beams, a
general research project has been recently undertaken. In particular, an experimental
investigation dealing with several extruded aluminium profiles subjected to moment
gradient loading has been carried out at the Norwegian University of Science and
Technology [1,2]. Subsequently, a numerical investigation concerning the
assessment of rotational capacity of aluminium rectangular hollow cross-sections
has been worked out at the University of Naples Federico II in cooperation with the
University of Chieti [3]. It has been concluded that the influence of above factors,
which are disregarded in the codified approach, is not always negligible. In
particular, material strain hardening provides a remarkable effect producing
variations of rotational capacity in a similar range of local slenderness.
The current paper focuses on the determination of the influence of each one of the
abovementioned parameters (local slenderness
Anyway, it seems that a simplified classification system for cross-sections based
on the relevant slenderness of compressed elements and the hardening properties of
the material could be of concern for codification purpose, especially when account is
made for the sole stable part of the rotational capacity provided that the hardening
effect is accounted for correctly. Therefore, a simplified method for the evaluation
of the rotational capacity of aluminium members, accounting for material hardening
and local slenderness variation, is proposed. The comparison with numerical results
obtained by means of the FEM model shows that, if the secondary parameters
(
References
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