The　use　of　Fiber-Reinforced　Polymer　(FRP)　bars　as　an　alternative　to　steel　bars　addresses　corrosion　challenges　in　conventional　concrete　structures.　However,　the　lower　elastic　modulus　of　FRP　bars　typically　leads　to　excessive　deformation　and　crack　widening.　This　study　investigates　the　synergistic　effects　of　combining　glass　FRP　(GFRP)　bars　with　Engineered　Cementitious　Composites　(ECC)　to　enhance　the　flexural　performance　of　concrete　beams.　Seven　beams　were　tested,　including　concrete,　full-ECC,　and　composite　beams　with　varying　reinforcement　ratios　and　configurations.　Results　demonstrated　that　ECC　integration　significantly　improved　load-bearing　capacity　(up　to　6.2　%　in　composite　beams),　ductility　(1.5　times　higher　than　concrete　beams),　and　crack　control　(crack　widths　reduced　by　83　%　in　composite　beams).　A　sectional　analysis　model　accurately　predicted　flexural　behavior,　revealing　that　the　tensile　contribution　of　ECC　diminishes　at　higher　reinforcement　ratios　(＞1.84　%),　thereby　serving　as　a　safety　reserve.　An　optimal　ECC　layer-to-beam　height　ratio　of　0.3–0.4　was　proposed　to　balance　performance.　This　work　advances　the　understanding　of　GFRP-ECC　systems,　offering　practical　insights　for　the　design　of　durable　and　high-performance　structures.　©　2025　Elsevier　Ltd