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Experimental analysis of corroded RC continuous beams rehabilitated by ICCP-SS under unsymmetrical loading

Feng, Ran; He, Xuanrui; Wang, Fangying; Zeng, Jun Jie; Zhu, Ji Hua

Experimental analysis of corroded RC continuous beams rehabilitated by ICCP-SS under unsymmetrical loading Thumbnail


Authors

Ran Feng

Xuanrui He

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FANGYING WANG FANGYING.WANG@NOTTINGHAM.AC.UK
Assistant Professor in Structural Engineering

Jun Jie Zeng

Ji Hua Zhu



Abstract

In this study, a total of 14 corroded reinforced concrete (RC) continuous beams rehabilitated by a dual function system—Impressed Current Cathodic Protection-Structural Strengthening (ICCP-SS) with carbon-fabric reinforced cementitious matrix (C-FRCM), were tested under in-plane bending (resulted from unsymmetrical loading) to investigate the influences of corrosion rate, layer of carbon fabric mesh, complete wrapping as the end anchorage and loading scheme. The flexural behaviour including failure modes, load-carrying capacities, load-deflection curves and ductilities of the specimens were carefully studied. The design flexural strengths were calculated based on the current design guidelines, which were compared with the experimental results. It's shown from the experimental data of five-point bending tests that beams strengthened with C-FRCM had higher yielding loads and ultimate loads than corroded beams without rehabilitation. However, the ductility of RC continuous beams was weakened by the C-FRCM strengthening method and its anodic polarization process, in particular for the specimens with more layers of carbon fabric meshes in prefabricated C-FRCM plates and complete wrapping as the end anchorage. Under unsymmetrical loading scheme, the delamination failure of concrete cover was observed and the application of complete wrappings was found to improve the ductility of the specimen. Comparison of the measured and predicted moment capacities showed that the current design guidelines generally underestimate the moment capacities of C-FRCM strengthened RC continuous beams, especially the specimens further strengthened by complete wrapping.

Citation

Feng, R., He, X., Wang, F., Zeng, J. J., & Zhu, J. H. (2022). Experimental analysis of corroded RC continuous beams rehabilitated by ICCP-SS under unsymmetrical loading. Structures, 46, 1171-1188. https://doi.org/10.1016/j.istruc.2022.10.110

Journal Article Type Article
Acceptance Date Oct 24, 2022
Online Publication Date Nov 10, 2022
Publication Date 2022-12
Deposit Date Dec 2, 2022
Publicly Available Date Nov 11, 2023
Journal Structures
Electronic ISSN 2352-0124
Peer Reviewed Peer Reviewed
Volume 46
Pages 1171-1188
DOI https://doi.org/10.1016/j.istruc.2022.10.110
Public URL https://nottingham-repository.worktribe.com/output/14040099

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