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Polymers 2017, 9(5), 180; doi:10.3390/polym9050180

Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

1
Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
2
Department of Civil Engineering, Dhaka University of Engineering and Technology (DUET), Gazipur 1700, Bangladesh
3
Architecture Discipline, Science, Engineering and Technology School, Khulna University, Khulna 9208, Bangladesh
*
Authors to whom correspondence should be addressed.
Academic Editor: Rui Xiao
Received: 1 April 2017 / Revised: 16 May 2017 / Accepted: 17 May 2017 / Published: 19 May 2017
(This article belongs to the Special Issue Functionally Responsive Polymeric Materials)

Abstract

Reinforced concrete (RC) structures require strengthening for numerous factors, such as increased load, modification of the structural systems, structural upgrade or errors in the design and construction stages. The side near-surface mounted (SNSM) strengthening technique with glass fiber-reinforced polymer (GFRP) bars is a relatively new emerging technique for enhancing the flexural capacities of existing RC elements. Nine RC rectangular beams were flexurally strengthened with this technique and tested under four-point bending loads until failure. The main goal of this study is to optimize the structural capacity of the RC beams by varying the amount of strengthening reinforcement and bond length. The experimental test results showed that strengthening with SNSM GFRP bars significantly enhanced the flexural responses of the specimens compared with the control specimen. The first cracking and ultimate loads, energy absorption capacities, ductility and stiffness were remarkably enhanced by the SNSM technique. It was also confirmed that the bond length of the strengthened reinforcement greatly influences the energy absorption capacities, ductility and stiffness. The effect of the bond length on these properties is more significant compared to the amount of strengthening reinforcement. View Full-Text
Keywords: flexural capacity; SNSM technique; GFRP; energy absorption; ductility; stiffness flexural capacity; SNSM technique; GFRP; energy absorption; ductility; stiffness
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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

Hosen, M.A.; Alengaram, U.J.; Jumaat, M.Z.; Sulong, N.H.R.; Darain, K.M. Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique. Polymers 2017, 9, 180.

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