The　external　bonding　of　fiber-reinforced　polymer　(FRP)　sheets　is　a　widely　used　method　for　strengthening　and　rehabilitating　existing　concrete　structures.　The　premature　failure　of　these　structures　is　frequently　attributed　to　debonding　at　the　FRP-concrete　interface,　highlighting　the　need　for　interface　studies.　In　this　study,　the　interface　properties　of　carbon　fiber-reinforced　polymer　(CFRP)　and　steel　fiber-reinforced　concrete　(SFRC)　were　investigated.　A　series　of　double-shear　tests　was　designed　with　variations　in　the　initial　angle　between　the　CFRP　sheet　and　SFRC　to　reflect　different　mixed-mode　scenarios.　A　streamlined　cohesive　zone　model　(CZM)　was　proposed　for　both　the　CFRP-SFRC　interface　slip　and　steel　fiber　slip.　The　complete　process　of　CFRP　sheet　delamination　from　SFRC　under　mixed-mode　conditions　was　simulated　using　a　finite-element　software.　The　simulated　results　were　in　good　agreement　with　the　experimental　results.　©　2023　American　Society　of　Civil　Engineers.