Given　the　extensive　utilization　of　composite　structures　of　ultra-high　performance　concrete　(UHPC)　and　normal　concrete　(NC)　in　engineering　applications,　there　has　been　a　growing　emphasis　on　studying　the　shear　failure　and　mechanical　properties　analysis　of　the　UHPC-NC　interface.　U-shaped　studs　assume　a　crucial　role　in　reinforcing　the　UHPC-NC　interface,　so　it　is　of　great　significance　to　analyze　the　shear　failure　of　UHPC-NC　interface　with　U-shaped　studs.　To　directly　observe　the　bonding　failure　process　between　studs　and　concrete　and　to　determining　the　failure　mechanism　of　the　UHPC-NC　interface　with　U-shaped　studs,　this　paper　establishs　the　three-dimensional　finite　element　model　to　investigate　the　local　damage　evolution　and　the　failure　pattern　of　UHPC-NC　incorporating　U-shaped　studs.　The　numerical　analysis　indicates　the　final　failure　pattern　of　the　UHPC-NC　interface　with　U-shaped　stubs　is　the　fracture　of　the　U-shaped　stud.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.　2024.