This study explores the structural behavior and load transfer characteristics of reinforced concrete (RC) beams externally retrofitted with hybrid fiber reinforced polymer (FRP) systems combining synthetic glass fibers (GFRP) and natural jute fibers (JFRP). Fourteen full-scale RC beams were tested under four-point bending to examine how different fiber types and strengthening schemes influence both strength and deformation capacity. To monitor precise structural response, the experimental setup utilized a spreader beam for symmetrical loading and LVDTs positioned at mid-span and supports to account for settlement. While existing research often focuses on mono-material reinforcement, this work provides a new contribution by conducting a comprehensive experimental evaluation of strategic fiber positioning on full-scale specimens. The experimental results demonstrate that different configurations yield distinct performance benefits: the JFRP U-wrap configuration (JBJS) achieved a 38% increase in ultimate strength with proper anchorage, while the GFRP U-wrap reached a 44% gain. A primary novelty of this investigation is the identification of the JBGS hybrid configuration (jute along the soffit and glass on the sides) as the most balanced and resilient system tested. Despite the higher material ductility of GFRP, this specific hybrid arrangement achieved a 28% strength gain and a 71% increase in ductility index, suggesting effective stress redistribution across the reinforcement layers. Failure observations extracted from detailed crack analysis point to more gradual crack development and improved load retention in hybrid systems. These findings offer insight into performance-driven design for sustainable structural rehabilitation by demonstrating how fiber synergy can be strategically optimized to balance mechanical efficiency and eco-efficiency.
