Aluminum alloys (AAs) possess various advantageous properties such as good corrosion resistance and high ductility and have recently gained interest in strengthening reinforced concrete (RC) structures. This paper investigates the potential application of AA bars as the near‐surface mounted (NSM) reinforcement in flexure strengthening of RC beams. A total of seven RC beams including one reference specimen and six specimens strengthened with NSM AA bars were designed and loaded monotonically up to failure. The tensile steel reinforcement ratio, NSM reinforcement ratio, precracking load, and bonding area of NSM reinforcement were selected as the main test variables. Results suggest that both the flexural capacity and stiffness of the strengthened beams improved with the use of NSM AA bars compared to the reference beam, and all the strengthened concrete beams exhibited a ductile failure mode. Nevertheless, increases in flexural load carrying capacities were modest when the AA bars were used as NSM reinforcement. Furthermore, an analytical model, which combined the sectional analysis method and interfacial stress analysis model, was developed to predict the load versus mid‐span deflection relationship of the concrete beams strengthened with NSM AA bars. The developed model was also capable of predicting the load–strain relationships in AA reinforcement. Good agreements were achieved between the analytical results and experimental results.

中文翻译：

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使用铝合金钢筋作为近表面安装的钢筋来抗弯钢筋混凝土梁的可行性

铝合金（AA）具有各种有利的特性，例如良好的耐腐蚀性和高延展性，并且最近对增强钢筋混凝土（RC）结构引起了兴趣。本文研究了AA筋作为近表面安装（NSM）钢筋在钢筋混凝土梁抗弯加固中的潜在应用。总共设计了七个RC梁，包括一个参考样本和六个用NSM AA筋加固的样本，并单调加载直至破坏。选择拉伸强度，NSM增强比，预裂载荷和NSM增强粘结面积作为主要测试变量。结果表明，与参考梁相比，使用NSM AA筋可以提高加固梁的抗弯能力和刚度，所有钢筋混凝土梁均表现出延性破坏模式。然而，当将AA筋用作NSM钢筋时，挠曲承载能力的增加是适度的。此外，建立了将截面分析方法和界面应力分析模型相结合的分析模型，以预测用NSM AA筋加固的混凝土梁的荷载与中跨挠度的关系。所开发的模型还能够预测AA钢筋中的载荷-应变关系。在分析结果和实验结果之间达成了良好的协议。开发了将截面分析方法和界面应力分析模型相结合的模型，以预测使用NSM AA筋加固的混凝土梁的荷载与中跨挠度的关系。所开发的模型还能够预测AA钢筋中的载荷-应变关系。在分析结果和实验结果之间达成了良好的协议。开发了将截面分析方法和界面应力分析模型相结合的模型，以预测使用NSM AA筋加固的混凝土梁的荷载与中跨挠度的关系。所开发的模型还能够预测AA钢筋中的载荷-应变关系。在分析结果和实验结果之间达成了良好的协议。