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<p>This study numerically investigates the monotonic response of exterior reinforced-concrete (RC) beam–column joints strengthened by iron-based shape-memory alloy (Fe-SMA) as longitudinal reinforcement in the beam. Three-dimensional finite-element models were developed in ABAQUS using C3D8R concrete elements and embedded truss elements for steel/Fe-SMA reinforcement; concrete nonlinearity was captured using the Concrete Damage Plasticity (CDP) framework. Fe-SMA strengthening was considered in an inactivated state and in activated (pre-strained) states, where recovery stress was introduced to represent thermally triggered prestress. A monotonic displacement procedure was applied at the beam tip under constant column axial load. A parametric matrix covering Fe-SMA pre-strain levels (2–8%) and activation temperatures (130 °C–190&#xa0;°C) was evaluated. Relative to the conventional steel-reinforced joint, activated Fe-SMA configurations increased peak resistance (typically by ~ 10–15% for the most effective cases) and substantially delayed the onset of severe joint tensile damage, reflected by an approximately two-fold increase in the numerically defined cracking indicator. In addition, activated Fe-SMA reduced CDP damage dissipation outputs, consistent with prestress-induced suppression of tensile damage accumulation under monotonic loading. The results quantify how recovery-stress magnitude governs strength enhancement and damage-mitigation trends, providing a reproducible modelling baseline for future cyclic assessments.</p>

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Self-adaptive superelastic shape-memory alloy reinforcement for damage-resilient and self-centering RC beam–column joints

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • G. M. Basavanagowda,
  • G. S. Abhilash,
  • G. B. Deepak,
  • Prashant Sunagar,
  • Manish S. Dharek,
  • P. Sughosh

摘要

This study numerically investigates the monotonic response of exterior reinforced-concrete (RC) beam–column joints strengthened by iron-based shape-memory alloy (Fe-SMA) as longitudinal reinforcement in the beam. Three-dimensional finite-element models were developed in ABAQUS using C3D8R concrete elements and embedded truss elements for steel/Fe-SMA reinforcement; concrete nonlinearity was captured using the Concrete Damage Plasticity (CDP) framework. Fe-SMA strengthening was considered in an inactivated state and in activated (pre-strained) states, where recovery stress was introduced to represent thermally triggered prestress. A monotonic displacement procedure was applied at the beam tip under constant column axial load. A parametric matrix covering Fe-SMA pre-strain levels (2–8%) and activation temperatures (130 °C–190 °C) was evaluated. Relative to the conventional steel-reinforced joint, activated Fe-SMA configurations increased peak resistance (typically by ~ 10–15% for the most effective cases) and substantially delayed the onset of severe joint tensile damage, reflected by an approximately two-fold increase in the numerically defined cracking indicator. In addition, activated Fe-SMA reduced CDP damage dissipation outputs, consistent with prestress-induced suppression of tensile damage accumulation under monotonic loading. The results quantify how recovery-stress magnitude governs strength enhancement and damage-mitigation trends, providing a reproducible modelling baseline for future cyclic assessments.