HYBRID FRP–CONCRETE COMPOSITE SYSTEMS FOR ENHANCED STRUCTURAL RESILIENCE

Abstract

Hybrid Fiber-Reinforced Polymer (FRP)–concrete composite systems have emerged as a promising solution for improving the strength, durability, and overall resilience of structural elements subjected to extreme loading conditions. Conventional reinforced concrete structures often experience premature cracking, reduced ductility, and progressive degradation under seismic, impact, and environmental stresses, necessitating advanced retrofit and strengthening strategies. This study investigates the structural performance of concrete elements strengthened with hybrid FRP composites, combining carbon, glass, and basalt fibers to optimize stiffness, energy absorption, and crack resistance. Experimental testing and analytical modeling were conducted to evaluate compressive strength, flexural behavior, and post-cracking response of hybrid FRP-confined specimens. Results indicate significant improvements in load-carrying capacity, deformation control, and failure mode transition, with hybrid systems outperforming single-fiber FRP configurations. The enhanced confinement and synergistic interaction of multiple fiber types contribute to improved ductility and resilience, making hybrid FRP–concrete composites a viable solution for seismic retrofitting, rehabilitation of aging infrastructure, and design of resilient structural systems. The findings highlight the potential of hybrid FRP composites in advancing nextgeneration civil infrastructure with superior performance and long-term reliability.