Abstract
Background: 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. Methods: 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. Results: 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. Conclusion: 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.
Highlights
The success of aluminium alloys as constructional material in civil engineering structural applications is based on some prerequisites
This paper aims to point out the role of Ramberg-Osgood Model (R-O) exponent n
Observing the trend of curves, it is evident that for each fixed value of bƒ/2tƒ, the moment ratio Mmax/M0.2 decreases when the R-O exponent n increases; this means that, even though aluminium alloys EN-AW6082 T6 and EN-AW6061 T6 are characterized by high yielding values, the plastic overstrength capacity is limited by the high values of the R-O exponent
Summary
The success of aluminium alloys as constructional material in civil engineering structural applications is based on some prerequisites. They are connected with the physical and mechanical properties, the production process, and technological features. The main properties of this material are: the lightness: its specific weight is 2700 kg/m3, which is equal to one-third that of steel; the corrosion resistance: (except for some specific alloys) thanks to the formation of a thin inert aluminium oxide film, which blocks further oxidation; the functionality of the structural shapes: due to the extrusion fabrication process, allowing the design of tai-. Some aluminium alloys have low-yielding and high hardening characteristics that make these materials suitable as hysteretic dampers and lightweight shear panel to be used for seismic protection of buildings [3 - 8]. High-yielding low-hardening aluminium alloys are preferred for normal structural elements. 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
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