Constitutive Model of Aluminum under Variable-Amplitude Cyclic Loading and Its Application to Buckling-Restrained Braces
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 3
Abstract
Aluminum has been increasingly used in space, building, and other structures owing to its light weight and high durability. The cyclic plasticity of aluminum is of great importance for the design of aluminum structures in regions with high seismic risk, where extremely large plastic strain loading is involved. For seismic loading, strain amplitudes can vary in a wide range, which makes it necessary to calibrate the plasticity model at the full strain range. This paper aims to present a straightforward approach to accurately evaluating hysteretic properties of aluminum material and structures under variable-amplitude cyclic loading within the full strain range until fracture. In this paper, a new method is proposed to calibrate the generalized Armstrong-Frederick model at the full strain range using only representative mechanical variables of structural aluminum such as yield strength and tensile strength. The newly proposed method is validated at both the material and member levels, respectively, through quasistatic cyclic experiments on double-edge notched specimens and aluminum buckling restrained braces. The validation results show that the proposed method can well describe the cyclic plasticity of aluminum members at the full strain range.
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Acknowledgments
The study is partially supported by National Natural Science Foundation of China (51508401 and 51608391) and Fundamental Research Funds for the Central Universities, which are greatly appreciated. Great thanks go to Prof. Chun-Lin Wang and Mr. Ye Liu for providing the experimental results of the aluminum BRBs and other support for this study. Thanks also go to Miss Zi-Fei Qing for the experimental supports.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 3 • March 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 15, 2017
Accepted: Sep 1, 2017
Published online: Dec 23, 2017
Published in print: Mar 1, 2018
Discussion open until: May 23, 2018
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