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Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

机译：近表面安装的复合材料用于钢筋混凝土梁的抗弯加固

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摘要

Existing structural components require strengthening after a certain period of time due to increases in service loads, errors in design, mechanical damage, and the need to extend the service period. Externally-bonded reinforcement (EBR) and near-surface mounted (NSM) reinforcement are two preferred strengthening approach. This paper presents a NSM technique incorporating NSM composites, namely steel and carbon fiber-reinforced polymer (CFRP) bars, as reinforcement. Experimental and analytical studies carried out to explore the performance of reinforced concrete (RC) members strengthened with the NSM composites. Analytical models were developed in predicting the maximum crack spacing and width, concrete cover separation failure loads, and deflection. A four-point bending test was applied on beams strengthened with different types and ratios of NSM reinforcement. The failure characteristics, yield, and ultimate capacities, deflection, strain, and cracking behavior of the beams were evaluated based on the experimental output. The test results indicate an increase in the cracking load of 69% and an increase in the ultimate load of 92% compared with the control beam. The predicted result from the analytical model shows good agreement with the experimental result, which ensures the competent implementation of the present NSM-steel and CFRP technique.
机译：现有的结构部件在一定时间段后需要加强，这是由于使用载荷增加，设计错误，机械损坏以及需要延长使用期限。外部粘结加固（EBR）和近表面安装（NSM）加固是两种首选的加固方法。本文提出了一种NSM技术，该技术结合了NSM复合材料，即钢和碳纤维增强的聚合物（CFRP）筋，作为增强材料。进行了实验和分析研究，以探索使用NSM复合材料增强的钢筋混凝土（RC）构件的性能。开发了预测最大裂缝间距和宽度，混凝土覆盖层分离破坏载荷和挠度的分析模型。对采用不同类型和比例的NSM加固的梁进行了四点弯曲试验。根据实验输出评估梁的破坏特性，屈服强度和极限承载力，挠度，应变和开裂行为。测试结果表明，与控制梁相比，裂纹载荷增加了69％，极限载荷增加了92％。分析模型的预测结果与实验结果吻合良好，从而确保了现有NSM钢和CFRP技术的有效实施。

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