This study represents the results of an empirical program investigating the behavior of square reinforced concrete (RC) columns retrofitted using longitudinal carbon fiber‐reinforced polymer (CFRP) composites under simulated seismic loading. The main challenges to tackle are the premature buckling and the debonding of the longitudinal FRP composites on the tension and compression sides of the columns, respectively. To postpone both, the two versions of the grooving methods (GM), that is, the externally bonded reinforcement on grooves (EBROG) and the externally bonded reinforcement in grooves (EBRIG), were employed and the results were compared with those obtained under the traditional externally bonded reinforcement (EBR) procedure. Another aspect of the study involves investigating the influence of the recently developed corner strip‐batten (CSB) method on confining column specimens. For these purposes, seven half‐scale RC columns strengthened using FRP sheets were subjected to reversal cyclic loading. Experimental results exhibited that using the EBRIG and EBROG methods simultaneously with CSB technique could prevent altogether the debonding and buckling of longitudinal CFRP sheets. It was also found that the application of FRP strips utilizing the GM and CSB methods could produce an important increment in the performance of the RC columns in different terms such as ductility and lateral strength.

中文翻译：

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使用开槽和角钢条形加固技术对纤维增强聚合物复合材料的方形钢筋混凝土柱进行抗震加固

这项研究代表了一个实验计划的结果，该计划研究了在模拟地震荷载下使用纵向碳纤维增强聚合物（CFRP）复合材料翻新的方形钢筋混凝土（RC）柱的性能。要解决的主要挑战分别是纵向FRP复合材料在立柱的受压侧和受压侧过早屈曲和脱粘。为了同时推迟这两种情况，采用了两种开槽方法（GM），即沟槽上的外部粘结加强筋（EBROG）和沟槽上的外部粘结加强筋（EBRIG），并将结果与​​在传统的外部粘结加固（EBR）程序。研究的另一个方面涉及调查最近开发的角钢条板压条（CSB）方法对约束柱样本的影响。为此，对7个用FRP板加固的半尺寸RC柱进行了反向循环荷载。实验结果表明，同时使用EBRIG和EBROG方法以及CSB技术可以完全防止纵向CFRP片材的剥离和屈曲。还发现利用GM和CSB方法的FRP条带的应用可以在延展性和侧向强度等不同方面显着提高RC柱的性能。实验结果表明，同时使用EBRIG和EBROG方法以及CSB技术可以完全防止纵向CFRP片材的剥离和屈曲。还发现利用GM和CSB方法的FRP条带的应用可以在延展性和侧向强度等不同方面显着提高RC柱的性能。实验结果表明，同时使用EBRIG和EBROG方法以及CSB技术可以完全防止纵向CFRP板的剥离和屈曲。还发现利用GM和CSB方法的FRP条带的应用可以在延展性和侧向强度等不同方面显着提高RC柱的性能。