Abstract Several confinement methods using concrete casing, steel jacketing, and wrapping with Fibre Reinforced Polymer (FRP) sheets are widely implemented to enhance the strength and ductility of reinforced concrete (RC) columns. Recently, smart materials such as Shape Memory Alloys (SMA) are utilized for repair and strengthening of RC columns. The SMA’s exhibit unique thermo-mechanical properties such as shape memory effect (SME) that enables the material to achieve high recovery stress (up to 600 MPa) and strain (up to 8%). Recent findings in the literature show the SME and high recovery stress of the SMA wires used to confine concrete columns significantly enhanced the strength and ductility performance of concrete. Realizing the potential of the SMA-confinement technique, this paper aims to present an analytical model to describe the behaviour of SMA-confined RC columns subjected to uni-axial compressive loads. Experimental data are compared against theoretically predicted results to validate the proposed analytical model. Results show the proposed analytical model predictions are in good agreement with the experimentally observed axial compressive response of SMA-confined RC columns.

中文翻译：

---

圆形SMA约束钢筋混凝土柱解析预测模型

摘要 使用混凝土套管、钢护套和纤维增强聚合物 (FRP) 板包裹的几种约束方法被广泛实施，以提高钢筋混凝土 (RC) 柱的强度和延性。最近，形状记忆合金 (SMA) 等智能材料被用于修复和加强 RC 柱。SMA 表现出独特的热机械特性，例如形状记忆效应 (SME)，使材料能够实现高恢复应力（高达 600 MPa）和应变（高达 8%）。文献中的最新发现表明，用于约束混凝土柱的 SMA 线的 SME 和高恢复应力显着提高了混凝土的强度和延展性。意识到 SMA 约束技术的潜力，本文旨在提出一个分析模型来描述 SMA 约束 RC 柱在单轴压缩载荷下的行为。将实验数据与理论预测结果进行比较，以验证所提出的分析模型。结果表明，所提出的分析模型预测与实验观察到的 SMA 约束 RC 柱的轴向压缩响应非常一致。