Experimental study on bond of ribbed Fe-SMA bars in concrete
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Tipus de documentText en actes de congrés
Data publicació2022
EditorUniversität Stuttgart
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Abstract
This paper presents an experimental study on the bond strength and bond-slip behavior of ribbed Fe-SMA bars embedded in concrete. A total of 19 pullout tests were conducted on 16-mm Fe-SMA bars embedded in concrete specimens fabricated with different levels of passive confinement. The bars had been pre-strained at 4% or 8% and were activated by resistive heating 28 days after concrete casting. Different activation temperature conditions were studied: 160℃, 300℃, and no heating. A limited number of pullout tests were also conducted on conventional steel bars for comparison. Pullout specimens with low confinement failed by splitting of concrete, while well-confined specimens presented pullout failures and higher bond strengths. Fe-SMA bars activated at 160℃ in well-confined specimens had a bond strength 15% lower than that of the control steel bars and a very similar bond stress-slip response. The bond strength of Fe-SMA bars embedded in low-confined specimens was significantly reduced with heat activation. It is concluded that with sufficient passive confinement, the overall bond performance of the Fe-SMA bars is adequate and comparable to that of conventional steel bars.
CitacióFawaz, G.; Murcia-Delso, J. Experimental study on bond of ribbed Fe-SMA bars in concrete. A: International Conference Bond in Concrete. "Bond in Concrete: Bond, Anchorage, Detailing: 5th International Conference, Stuttgart, Germany, 25th-27th July 2022: proceedings". Stuttgart: Universität Stuttgart, 2022, p. 270-278. DOI 10.18419/opus-12271.
Versió de l'editorhttps://elib.uni-stuttgart.de/handle/11682/12288
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