Compared　to　using　steel　bars　or　Fiber　Reinforced　Polymer　(FRP)　bars　alone,　Steel-FRP　composite　bars　(SFCBs)　offer　superior　corrosion　resistance,　higher　elastic　modulus　and　ductility,　suggesting　their　suitability　in　harsh　environments.　Engineered　Cementitious　Composite　(ECC)　provides　outstanding　tensile　strength　and　crack　control　capability,　exhibiting　significant　pseudo-strain　hardening　with　an　extremely　high　ultimate　tensile　strain.　This　research　explores　the　static　flexural　performance　of　SFCB-reinforced　concrete-ECC　(SFCB-RC/EC)　composite　beams,　focusing　on　the　effects　of　SFCB　bars　and　ECC　materials　on　failure　patterns,　load-carrying　capacity,　deflection,　strain,　cracking　and　ductility.　Results　revealed　that　SFCBs　provided　excellent　post-yielding　stiffness,　and　ECC　effectively　limited　crack　development　and　fully　utilized　matrix　strain　in　both　tensile　and　compressive　zones.　Compared　to　SFCB-reinforced　concrete　beam,　the　SFCB-RC/EC　beam　as　the　correspinding　specimen　showed　a　38.3　%　increase　to　load-carrying　capacity,　and　a　42.8　%　improvement　to　energy　ductility　coefficient,　significantly　enhancing　the　beam　deformability.　A　cross-sectional　analysis　method　for　SFCB-RC/EC　beams　was　developed　based　on　reasonable　assumptions　and　a　simplified　constitutive　model　for　the　materials.　The　impact　of　ECC　tensile　strength　was　examined　in　relation　to　reinforcement　ratio　of　SFCB　and　height　of　the　ECC　layer.　A　quantification　method　for　determining　the　SFCB　reinforcement　ratio　was　suggested　as　a　safety　reserve　for　the　contribution　of　ECC　tensile　strength　and　the　height　of　the　ECC　layer.　Additionally,　a　simplified　analytical　model　for　the　load-bearing　capacity　of　SFCB-RC/EC　beams　was　developed.　The　predicted　values　from　the　model　showed　good　agreement　compared　to　experimental　results,　confirming　the　validity　of　the　proposed　model　and　their　applicability　in　engineering　practice.　©　2024　Elsevier　Ltd