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Polymers 2016, 8(7), 261; doi:10.3390/polym8070261

Strengthening of RC Beams Using Externally Bonded Reinforcement Combined with Near-Surface Mounted Technique

1
Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2
Architecture Discipline, Science, Engineering and Technology School, Khulna University, 9208 Khulna, Bangladesh
*
Authors to whom correspondence should be addressed.
Academic Editors: Masoud Motavalli and Alper Ilki
Received: 21 May 2016 / Revised: 4 July 2016 / Accepted: 11 July 2016 / Published: 19 July 2016
View Full-Text   |   Download PDF [5756 KB, uploaded 19 July 2016]   |  

Abstract

This study investigates the flexural behaviour of reinforced concrete (RC) beams strengthened through the combined externally bonded and near-surface mounted (CEBNSM) technique. The externally bonded reinforcement (EBR) and near-surface mounted (NSM) techniques are popular strengthening solutions, although these methods often demonstrate premature debonding failure. The proposed CEBNSM technique increases the bond area of the concrete–carbon fibre reinforced polymer (CFRP) interface, which can delay the debonding failure. This technique is appropriate when any structure has a narrow cross-sectional width or is in need of additional flexural capacity that an individual technique or material cannot attain. An experimental test matrix was designed with one control and five strengthened RC beams to verify the performance of the proposed technique. The strengthening materials were CFRP bar as NSM reinforcement combined with CFRP fabric as EBR material. The test variables were the diameter of the NSM bars (8 and 10 mm), the thickness of the CFRP fabrics (one and two layers) and the U-wrap anchorage. The strengthened beams showed enhancement of ultimate load capacity, stiffness, cracking behaviour, and strain compatibility. The ultimate capacity of the CEBNSM-strengthened beams increased from 71% to 105% compared to that of the control beam. A simulation method based on the moment-rotation approach was also presented to predict the behaviour of CEBNSM-strengthened RC beams. View Full-Text
Keywords: CEBNSM; CFRP; externally bonded; near surface mounted; moment-rotation analysis CEBNSM; CFRP; externally bonded; near surface mounted; moment-rotation analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Darain, K.M.; Jumaat, M.Z.; Shukri, A.A.; Obaydullah, M.; Huda, M.N.; Hosen, M.A.; Hoque, N. Strengthening of RC Beams Using Externally Bonded Reinforcement Combined with Near-Surface Mounted Technique. Polymers 2016, 8, 261.

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