Behaviour of RC Beams Strengthened with Glass Fiber Reinforced Polymer

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue V, May 2018 | ISSN 2321–2705

Behaviour of RC Beams Strengthened with Glass Fiber Reinforced Polymer

Milan Surana¹, Dr. M. N. Bajad²

¹Research Scholar, Department of Civil Engineering, Sinhgad College of Engineering, Pune, Maharashtra, India
²Associate Professor, Department of Civil Engineering, Sinhgad College of Engineering, Pune, Maharashtra, India

Abstract: Several studies have been conducted to investigate the strength of RC members with fiber reinforced polymers (FRPs). Concrete structural members such as beams, columns, walls are a part of various buildings. Understanding the response of these members of structures strengthened with FRP is crucial for the development of an efficient and safe structure. The problem of accurately determining the shear capacity of structural concrete members appears rather difficult to solve, despite many studies carried out in recent decades. In particular, glass-fiber-reinforced polymer (GFRP) is being used in a growing number of applications because of their superior performance at a relatively competitive cost. In this study, a set of 5 control beams namely C1, C2, C3, C4 and C5 with different reinforcements were taken. C1 beam was designed as fully strengthened beam so it was not retrofitted with GFRP. The reinforcement of the other four beams was changed so they were deficient in strength. These deficient beams were retrofitted with GFRP strips (inclined and U wrap fashion). The shear stress and strain parameters of the control beams and the retrofitted beams were observed and noted. Also, the stress strain curve of the beams was studied. It was found that the strength of beams improved with the addition of GFRP.

Keywords: FRP, Shear stress – strain, Strength, RC beam, resin epoxy

I. INTRODUCTION

Enhancement of concrete structures may be required for a wide range of reasons. The concrete structures may have turned out to be fundamentally in sufficient for instance, because of material deterioration, poor configuration or development, maintenance absence, redesigning of outline burdens, for example, natural causes like earthquakes. The strength of a corroding steel reinforcing bar is reduced because of a reduction in the cross-sectional area of the steel bar. While the steel reinforcing bars are corroding, the concrete integrity is impaired because of cracking of the concrete cover caused by the expansion of the corrosion products. Replacement of such deficient structures incurs a huge amount of public money and time. So, strengthening has become the acceptable way of improving their strength and serviceability [1]. Glass fibers are significantly cheaper than carbon fibers and aramid fibers.

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