Abstract This paper presents an experimental investigation on the flexural behaviour of corroded reinforced concrete (RC) continuous beams strengthened by carbon fabric-reinforced cementitious matrix (C-FRCM). A total of ten specimens with different degrees of corrosion were tested under in-plane bending. The strengthening C-FRCM plates were prefabricated with different layers of carbon fabric meshes for reinforcement, while some specimens were further strengthened by U-shaped wrapping for C-FRCM plates as the end anchorage. The flexural behaviour including failure modes, load-carrying capacities, deflections and redistribution of bending moment were carefully studied. The test results show that the load-carrying capacities of RC continuous beams were enhanced by the prefabricated C-FRCM plates and the enhancement further increased with the increase of the layer of carbon fabric meshes, in particular the specimens strengthened by U-shaped wrapping that effectively inhibited the debonding of C-FRCM plates. However, the redistribution capacities of the bending moment of RC continuous beams were weakened by the prefabricated C-FRCM plates. The design flexural strengths calculated using the design formulae given in ACI 440.2R-08, ACI 549.4R-13, AC434-0616-R1, FIB Bulletin 14 and CECS 146-2003 (2007) are also compared with the test flexural strengths, in which ACI 549.4R-13 and AC434-0616-R1 are the identical design guidelines for FRCM system, while the other three design guidelines are specific to FRP system. It is shown that the current design guidelines are all conservative for C-FRCM strengthened RC continuous beams, especially the specimens further strengthened by U-shaped wrapping, in which FIB Bulletin 14 provides the best predictions with the smallest value of COV.

中文翻译：

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C-FRCM加强锈蚀钢筋混凝土连续梁的抗弯性能

摘要 本文对碳纤维增强水泥基体（C-FRCM）加固的腐蚀钢筋混凝土（RC）连续梁的弯曲行为进行了试验研究。在面内弯曲下测试了总共十个具有不同腐蚀程度的试样。加固C-FRCM板预制不同层数的碳纤维网进行加固，部分试件采用U形缠绕C-FRCM板作为端部锚固进一步加固。弯曲行为包括失效模式、承载能力、挠度和弯矩的重新分布进行了仔细研究。试验结果表明，预制C-FRCM板增强了RC连续梁的承载能力，并且随着碳纤维网层数的增加，增强程度进一步增强，特别是U形包裹加强的试件，有效地抑制了 C-FRCM 板的脱粘。然而，预制的 C-FRCM 板削弱了 RC 连续梁的弯矩再分配能力。使用 ACI 440.2R-08、ACI 549.4R-13、AC434-0616-R1、FIB Bulletin 14 和 CECS 146-2003 (2007) 中给出的设计公式计算的设计弯曲强度也与测试弯曲强度进行了比较，在其中 ACI 549.4R-13 和 AC434-0616-R1 是 FRCM 系统的相同设计指南，而其他三个设计指南是特定于 FRP 系统的。