Reinforced concrete has emerged as a primary construction material since the nineteenth century. A passive combination of concrete and steel reinforcing bar (rebar), this composite material is widely used in various types of structures. However, corrosion of steel reinforcement has been identified as a significant problem affecting the structural integrity of such concrete structures. In this context, the use of GFRP bars is gaining prominence due to their non-corrosive nature. This paper presents behaviour of flexural members reinforced with GFRP bars. The strength reduction factors and guidelines available with different codes for flexural members are studied. The design of flexural members reinforced with GFRP bars has been done using Indian Standard code parameters. The flexural capacity of the beams is estimated from the strain compatibility and equilibrium of forces. The theoretical and experimental results are compared. It is seen that designing the beams as an over-reinforced section will increase the stiffness of the beams.
Since the nineteenth century, reinforced concrete was evolved as a crucial material for construction. This popular composite material is broadly used in different building typologies. However, the decaying of steel rebar due to corrosion is identified as a hindrance that can affect the quality of reinforced concrete structures. In reference to this, the glass fiber-reinforced polymer (GFRP) bar is essential because of corrosion-resistant properties. The researchers performed various tests and numerical analysis to know the response of GFRP-reinforced flexural members in shear and bending. Based on studies over the last decade, this study critically analyzes the response of flexural member reinforced using glass fiber-reinforced polymer (FRP) bars. Understanding the behavior of the FRP bar as the alternating reinforcing material will be aided by this review. Since the GFRP bar has high strength and no yield point, the conventional characterizations of ductility may not be applicable to determine whether GFRP-reinforced concrete components are ductile. Hence, a detailed study is needed to understand the behavior of such structures. This paper explores various properties of GFRP-reinforced beams to appreciate the applications of GFRP reinforcement in flexural members.
Due to the ongoing environmental changes, degradation of directly exposed material is seen very often. This results in issues related to aesthetics, function, and most importantly, the safety of the structures. Reinforced cement concrete (RCC) is the most commonly used material for construction where steel bars are used as reinforcement. Steel reinforcement in contact with the chemicals like chlorides and sulphates etc. which are very commonly present in urban and industrial areas and other aggressive environment, gets corroded, thus affecting the structural behaviour. Research studies propose replacing steel rebars with Glass Fibre Reinforced Polymer (GFRP) bars due to its non-corrosive properties. This paper presents the analysis and design of GFRP reinforced concrete columns. Present design methods mentioned in Indian Standard Code are not applicable to design GFRP reinforced RC columns directly. This study is an attempt to develop design provisions for GFRP reinforced concrete columns similar to those in practice for steel-reinforced columns. The spacing of ties influences the capacity of the column to carry load and failure type of compression member. So, this paper will also focus on the design of ties to provide proper confinement.
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