Anchorage systems have been proven to efficiently prevent or postpone debonding of reinforced concrete structures strengthened in flexure with fiber‐reinforced polymer (FRP) laminate or sheet. Although extensive studies on the effect of anchorage systems on intermediate crack debonding and end debonding of strengthened members have been performed, the effect of U‐shaped anchorages on commonly faced concrete cover separation remains unclear, and a corresponding design proposal has not been completed, which limits the practical use of anchorage systems for strengthening. In this study, carbon fiber‐reinforced polymer (CFRP)‐strengthened beams with notches at the sheet end and CFRP U‐shaped anchorages of various widths and heights were specially designed to investigate the effects of anchorages on strength of concrete cover separation. The height of the U‐shaped anchorage was proved more important than its width to improve concrete cover separation strength, and the related mechanism was discussed. Furthermore, an analytical model was developed to predict the initial and full separation load of concrete cover with U‐shaped anchorages. The reliability and accuracy of the proposed analytical procedure were verified against the test results.

中文翻译：

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U型锚固对板端有缺口的碳纤维增强聚合物加强梁中混凝土表层分离的影响

锚固系统已被证明可以有效防止或推迟使用纤维增强聚合物（FRP）层压板或板材加固的挠曲钢筋混凝土结构的脱胶。尽管已对锚固系统对加固构件的中间裂缝脱粘和端部脱粘的影响进行了广泛的研究，但U型锚固对常用面混凝土盖层分离的影响尚不清楚，因此尚未完成相应的设计方案。限制了锚固系统在加固中的实际使用。在这项研究中，专门设计了碳纤维增强聚合物（CFRP）增强梁，该梁在板端有缺口，并设计了各种宽度和高度的U型CFRP U型锚固，以研究锚固对混凝土覆盖层分离强度的影响。事实证明，U型锚固的高度比其宽度更重要，以提高混凝土表层的分离强度，并讨论了相关的机理。此外，开发了一个分析模型来预测具有U形锚固的混凝土覆盖层的初始和完全分离载荷。相对于测试结果，验证了所提出分析方法的可靠性和准确性。