Journal of Polymer & Composites Review Article
A Review on Strengthening of RC Beam with GFRP Composite in Shear
Abstract
Glass fibre-reinforced polymer (GFRP) composites have emerged as an effective and lightweight technique for enhancing the shear performance of reinforced concrete (RC) beams, particularly in strengthening and rehabilitation applications. This review examines the influence of GFRP configuration on the shear behaviour, strength, cracking response, deformation, and failure mechanisms of strengthened RC beams. The discussion covers side-bonded, vertical and inclined GFRP strips, U-shaped wrapping, and complete wrapping configurations, with emphasis on fibre orientation, number of layers, bonded length, anchorage, and interaction with existing steel stirrups. The review highlights that the effectiveness of GFRP strengthening is governed not only by the nominal tensile capacity of the composite but also by its ability to intersect diagonal cracks and transfer tensile stresses effectively through the concrete–adhesive–GFRP interface. Improved anchorage and wrapping configurations can reduce premature debonding and enhance the mobilization of GFRP capacity. However, increasing the quantity of GFRP does not necessarily produce proportional increases in shear strength when interface failure or concrete cover separation governs the response. The review also emphasizes the importance of evaluating diagonal cracking load, ultimate capacity, load-deflection behaviour, crack width, stiffness, failure mode, GFRP strain, and energy absorption. Overall, appropriate GFRP configuration should be selected considering structural efficiency, constructability, durability, accessibility, reliability, and the existing beam characteristics.
Keywords
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