Experimental Studies on Rounded Rectangular Opening in Beams

Abstract: This paper provides a comprehensive overview of the extensive body of research pertaining to the strengthening of beams with openings using Fiber Reinforced Polymers (FRP). Openings in structural beams, necessitated by functional requirements such as accommodating services or architectural designs, introduce complexities that demand specialized strengthening techniques to ensure structural integrity and performance. The challenges associated with beams featuring openings, ranging from the reduction in load-carrying capacity to potential stress concentration. It then delves into the evolution of FRP materials and solution for retrofitting and enhancing structural members, including Carbon Fiber Reinforced Polymers (CFRP), Glass Fiber Reinforced Polymers (GFRP). A critical analysis of the existing research explores various strengthening techniques involving FRP laminates and wraps applied externally, internally, or in combination around openings. The review also discusses the influence of factors such as adhesive systems, fiber orientation, and installation methods on the effectiveness of FRP strengthening. Identifies research gaps and potential areas for further exploration, ultimately serving as a valuable resource for researchers, and practitioners involved in the rehabilitation and enhancement of structural systems with openings.

Keywords: CFRP, GFRP laminates, RC beams, opening of beams, failure crack pattern, strengthening of beams.