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Title: Bond Behavior of Ribbed Iron-Based Shape Memory Alloy Bars Embedded in Concrete

Author(s): Ghassan Fawaz

Publication: Web Session



Appears on pages(s):



Date: 6/1/2020

Iron‐based shape memory alloys (Fe‐SMA) have shown promising properties that can be used in reinforced concrete structures. Their shape‐memory effect and relatively high stiffness make them suitable for self‐prestressing strengthening applications. This presentation will provide an overview of an experimental study on the bond strength and bond‐slip behavior of ribbed Fe‐SMA bars in concrete. A total of twenty‐seven pullout tests were conducted on 16‐mm (#5) Fe‐SMA bars embedded in concrete specimens with different levels of passive confinement. The bars, which had been pre‐strained at 4% prior to specimen fabrication, were activated by resistive heating at 28 days after casting. Different activation temperature conditions were studied (160?, 300?, and no heating). Pullout specimens with low confinement failed by splitting of concrete, while well‐confined specimens presented pullout failures and higher bond strengths. Test results show that the bond strength of low‐confined specimens was affected by the activation temperature. Finally, bond stress‐slip curves have been obtained and compared to those of conventional steel bars.