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Bending behaviour of corroded RC continuous beams with C-FRCM strengthening system

Feng, Ran; Liu, Panpan; Zhang, Jingzhou; Wang, Fangying; Xu, Ying; Zhu, Ji-Hua

Authors

Ran Feng

Panpan Liu

Jingzhou Zhang

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FANGYING WANG Fangying.Wang@nottingham.ac.uk
Assistant Professor in Structural Engineering

Ying Xu

Ji-Hua Zhu



Abstract

This paper presents a numerical investigation into the bending behaviour of uncorroded and corroded reinforced concrete (RC) continuous beams with a strengthening system. Finite element analysis (FEA) was performed on ten RC beams considering interface performance, including five uncorroded and five corroded beams. The cracks development, bending capacities and load-displacement curves of the simulated RC beams in the loading process were validated against those from tests. Then, a parametric study including 35 RC beam models, considering the effects of carbon-fabric (CF) mesh layer, complete wrapping layer and the degree of corrosion of steel bar on their bending capacities, was conducted. Ductility and strengthening effects of specimens were discussed in the parametric study. It can be found that the carbon-fabric reinforced cementitious matrix (C-FRCM) strengthening system can improve the bending capacities of the corroded RC beams. As the layer of CF mesh increases, the ductility of the specimen decreases. The combined use of the C-FRCM plate and the complete wrapping as the end anchorage enhanced the ultimate loads of RC beams to a greater extent than those strengthened with C-FRCM plate only. The applicability of current design codes for RC beams with C-FRCM strengthening system was examined through comparisons of the bending capacity predictions of RC beams with those obtained from tests and numerical analyses. It was found that European Code (FIB Bulletin 14) provides more accurate predictions than American Specifications (ACI 549.4R-20, AC 434-0616-R1, ACI 440.2R-17) and Chinese Code (CECS 146–2003 (2007)). Therefore, design modifications based on the most accurate design rule of FIB Bulletin 14 were made. By utilizing regression analysis on the numerical results, the formula for bending capacities of the examined RC beams was proposed and showed improved accuracy.

Citation

Feng, R., Liu, P., Zhang, J., Wang, F., Xu, Y., & Zhu, J. (2022). Bending behaviour of corroded RC continuous beams with C-FRCM strengthening system. Journal of Building Engineering, 60, Article 105229. https://doi.org/10.1016/j.jobe.2022.105229

Journal Article Type Article
Acceptance Date Sep 2, 2022
Online Publication Date Sep 7, 2022
Publication Date Nov 15, 2022
Deposit Date Nov 2, 2022
Publicly Available Date Sep 8, 2023
Journal Journal of Building Engineering
Electronic ISSN 2352-7102
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 60
Article Number 105229
DOI https://doi.org/10.1016/j.jobe.2022.105229
Keywords Mechanics of Materials; Safety, Risk, Reliability and Quality; Building and Construction; Architecture; Civil and Structural Engineering
Public URL https://nottingham-repository.worktribe.com/output/10920178
Additional Information This article is maintained by: Elsevier; Article Title: Bending behaviour of corroded RC continuous beams with C-FRCM strengthening system; Journal Title: Journal of Building Engineering; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jobe.2022.105229; Content Type: article; Copyright: © 2022 Elsevier Ltd. All rights reserved.