Comparative analysis of armid fiber reinforced polymer for strengthening reinforced concrete beam-column joints under cyclic loading

Abstract

This research investigates the structural performance and failure mechanisms of beam-column joints reinforced with aramid fiber-reinforced polymer to bolster the durability and seismic resilience of concrete structures. It meticulously selects and proportions materials such as ordinary Portland cement Grade 53 cement, fine and coarse aggregates meeting IS: 383–1970 standards, and water conforming to IS: 456–2000 specifications. Tests confirm the high quality of ordinary Portland cement, crucial for optimal beam-column joint performance, while carbon fiber-reinforced polymer enhances structural integrity with its lightweight composition and substantial tensile strength (3800 MPa–4200 MPa). Failure analysis reveals that non-aramid fiber reinforced polymer wrapped beam-column joint specimens predominantly failed due to concrete crushing, whereas aramid fiber-reinforced polymer-wrapped specimens failed due to fracture in the aramid fiber-reinforced polymer composite, emphasizing stress concentration areas. This study underscores the pivotal role of stress distribution in failure mechanisms and underscores the significance of robust reinforcement design in bolstering structural resilience. These insights advance retrofitting strategies and reinforce techniques aimed at enhancing the longevity and seismic resistance of concrete structures.