S. Marvel Dharma PG Student, Dept. of Civil Engineering EBET Group of Institutions, Tirupur, India Id: [email protected]Abstract- The Strength of conventional reinforced concrete gets progressively reduced due to the degradation of the steel bars. GFRP bars being high strength, low self-weight and non-corrodable remains to be the better replacement for steel bars. The behaviour of GFRP-RC members and Steel-RC members tends to vary. This paper gives a review on the researches carried out on the performance of GFRP rebars. Low elasticity modulus and brittle nature reduces the ductility of the GFRP-RC beams. The steel fibres and the steel longitudinal reinforcement are added as a measure to improve the ductility of the members. The members are to be preferably designed as over reinforced as per ACI 440 1R-06 and deflection predicting equations are validated. Key words: GFRP, Beams, ACI, Ductility, Codal provisions. I. INTRODUCTION Steel rebars have been the reinforcing medium in concrete structures for decades. Their performance dips when exposed to aggressive environments such as coastal and marine structures, bridges, chemical plants and wastewater treatment facilities. The corrosion problem has been the major concern in the structural deterioration. Several measures have been taken to overcome corrosion problems in steel reinforcement such as use of admixtures, coated steel rebars etc. Among these measures, for the past few years there has been an increase in the use of alternative reinforcing materials for concrete in harsh environments. The recent advancements in composites have led to the development of Fibre- Reinforced Polymer (FRP) rebars that possess the strength and corrosion resistance properties than that of steel. The Fibre Reinforced Polymer (FRP) material promises to be a better alternative for steel as reinforcing medium. They are made of fibers S. Yamini Roja Assistant Professor, Dept. of Civil Engineering Sri Ramakrishna Institute Of Technology, Coimbatore, India. Id: [email protected]reinforced in polymers. High tensile strength, light weight and non-corroding nature are its advantages. Glass Fibre Reinforced Polymer (GFRP) Carbon Fibre Reinforced Polymer (CFRP), Basalt Fibre Reinforced Polymer (BFRP) and Aramid Fibre Reinforced Polymer (AFRP) comes under the types of FRP’’s. Among these, GFRP is effective in structural applications. These rebars are reinforced by fine fibres of glass. Resistance to chemical attack and electromagnetic neutrality are some of its other advantages. However, their effective use in reinforced concrete has been very limited due to lack of research and design specifications. Poor ductility is one of the considerable disadvantages of GFRP rebar. II. PROBLEM STATEMENT The behaviour of concrete beams reinforced with FRPbars (FRP-RC) is different from conventional RC beams due to the differences between the physicaland mechanical properties of FRP and steel reinforcements. Owing to the lower modulus of elasticity the FRP-RC beams exhibit lower serviceability performance compared to steel bars. The rigid and brittle behaviour of FRP bars forces the FRP-RC beams to be designed as over-reinforced making the failure by crushing of concrete. The surface textures and mechanical features of FRP bars are different from steel bars and thus the bond behaviour is a major concern in FRP—RC members. The bond between the FRP bars and the concrete is affected by various factors. Limited experimental researches exist for FRP reinforced concrete deep beams. Shear behaviour of them is not clear and the shear capacity of deep beams is a major issue in their design. Being a composite material their surface seems to be weaker than that of steel bars. The linear elastic brittle behavior of FRP bars results poor ductility in the flexural behavior of FRP-reinforced concrete beams. Due to the linear elastic properties of the FRP bars up to failure, the conventional ductility REVIEW ON BEHAVIOUR OF GLASS FIBRE REINFORCED POLYMER RC MEMBERS
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REVIEW ON BEHAVIOUR OF GLASS FIBRE … designed as over reinforced as per ACI 440 1R-06 and deflection predicting equations are validated. Key words: GFRP, Beams, ACI, Ductility, Codal
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