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Behaviour of circular SMA-confined reinforced concrete columns subjected to eccentric loading
Highlights Strength and deformability of the actively SMA-confined columns increased significanlty. The axial strength capacity of the CFRP and the SMA-confined columns were comparable. Ductility of the SMA-confined columns was improved significantly than the CFRP-confined columns.
Abstract Shape Memory Alloys (SMA) are recently utilized for strengthening/repair of concrete structures. Commonly used SMA wires used for concrete confinement applications are those in Nickel-Titanium (NiTi), because they possess unique thermo-mechanical properties such as shape memory effect (SME) along with high recovery stress (up to 600 MPa) and strain (up to 8%). Initial investigations reported in the literature show actively confining concrete columns with SMA wires can enhance the strength and the ductility of concrete. To date, vast majority of experiments on SMA-confined concrete have considered short, unreinforced, small-scale concrete cylinders subjected to concentric axial loading. The objective of this study is to present a systematic study of circular SMA-confined reinforced concrete (RC) columns subjected to eccentric loading. Test data are compared against identical unconfined RC columns, and RC columns confined passively using conventional CFRP sheets. The results of this study show the RC columns confined with active SMA spirals exhibited significant enhancement in strength and ductility compared to unconfined RC columns subjected to varying load eccentricity. Additionally, the SMA-confined RC columns demonstrated superior overall performance when compared to the conventional passive CFRP-confined RC columns.
Behaviour of circular SMA-confined reinforced concrete columns subjected to eccentric loading
Highlights Strength and deformability of the actively SMA-confined columns increased significanlty. The axial strength capacity of the CFRP and the SMA-confined columns were comparable. Ductility of the SMA-confined columns was improved significantly than the CFRP-confined columns.
Abstract Shape Memory Alloys (SMA) are recently utilized for strengthening/repair of concrete structures. Commonly used SMA wires used for concrete confinement applications are those in Nickel-Titanium (NiTi), because they possess unique thermo-mechanical properties such as shape memory effect (SME) along with high recovery stress (up to 600 MPa) and strain (up to 8%). Initial investigations reported in the literature show actively confining concrete columns with SMA wires can enhance the strength and the ductility of concrete. To date, vast majority of experiments on SMA-confined concrete have considered short, unreinforced, small-scale concrete cylinders subjected to concentric axial loading. The objective of this study is to present a systematic study of circular SMA-confined reinforced concrete (RC) columns subjected to eccentric loading. Test data are compared against identical unconfined RC columns, and RC columns confined passively using conventional CFRP sheets. The results of this study show the RC columns confined with active SMA spirals exhibited significant enhancement in strength and ductility compared to unconfined RC columns subjected to varying load eccentricity. Additionally, the SMA-confined RC columns demonstrated superior overall performance when compared to the conventional passive CFRP-confined RC columns.
Behaviour of circular SMA-confined reinforced concrete columns subjected to eccentric loading
El-Hacha, Raafat (author) / Abdelrahman, Khaled (author)
Engineering Structures ; 215
2020-02-26
Article (Journal)
Electronic Resource
English
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