This research describes the results of an experimental work that aimed to investigate the flexural capacity of RC columns with low longitudinal reinforcement ratio that was strengthened with near surface mounted GFRP bars. The experimental program consisted of four square reinforced concrete columns, including one control specimen that were designed with a longitudinal reinforcement ratio below the minimum required ratio of 1% specified by RC design codes. Three of the four specimens were strengthened with different ratios NSM GFRP bar. The specimens were tested under a combined axial compressive load and lateral cyclic displacement to evaluate this retrofit method for the flexural improvement of RC columns. The efficacy of the proposed strengthening method on the flexural capacity, failure modes, hysteretic curves, energy dissipation capacity, and stiffness are discussed on the basis of the test results. The experimental results demonstrated that the contribution of GFRP bars to the flexural capacity of RC columns was significant. Also, an analytical procedure for calculating the bending moment capacity of RC columns strengthened with GFRP bars subjected to axial and lateral is proposed. The model accuracy is demonstrated by comparing the model predictions with the experimental results. The flexural capacity calculated by this method were in good agreement with the experimental results.

中文翻译：

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使用GFRP钢筋对低纵钢比RC柱进行抗弯加固

本研究描述了一项试验工作的结果，该工作旨在研究用近表面安装的 GFRP 钢筋加固的纵向配筋率低的 RC 柱的抗弯能力。实验程序由四个方形钢筋混凝土柱组成，包括一个控制试件，其纵向配筋率低于 RC 设计规范规定的最低要求 1%。四个试样中的三个用不同比率的 NSM GFRP 钢筋加固。试样在轴向压缩载荷和横向循环位移的组合下进行测试，以评估这种改造方法对 RC 柱的抗弯改进。所提出的加固方法对抗弯能力、失效模式、滞后曲线、能量耗散能力的有效性，和刚度根据试验结果进行讨论。实验结果表明，GFRP 钢筋对钢筋混凝土柱的抗弯承载力的贡献是显着的。此外，还提出了一种计算用 GFRP 钢筋加固的 RC 柱的弯矩承载力的分析程序。通过将模型预测与实验结果进行比较来证明模型的准确性。该方法计算的抗弯承载力与实验结果吻合较好。提出了一种计算用 GFRP 钢筋加固的 RC 柱的弯矩承载力的分析程序。通过将模型预测与实验结果进行比较来证明模型的准确性。该方法计算的抗弯承载力与实验结果吻合较好。提出了一种计算用 GFRP 钢筋加固的 RC 柱的弯矩承载力的分析程序。通过将模型预测与实验结果进行比较来证明模型的准确性。该方法计算的抗弯承载力与实验结果吻合较好。