This　study　investigates　the　effect　of　the　degree　of　bending　and　doping　of　steel　fibers　on　the　macroscopic　mechanical　properties　of　UHPC.　To　achieve　this,　four　curvilinear　steel　fibers　of　different　curvature　radius　(20,　30,　40　and　50 mm)　and　straight　steel　fiber　were　employed.　Mechanical　properties　of　UHPC　including　flowability,　compressive　and　flexural　strengths　were　assessed.　Moreover,　analysis　of　flexural　tests　on　curvilinear　fiber　UHPC　specimens　was　performed　using　finite　element　simulation.　The　test　results　show　that　the　use　of　curved　steel　fibers　reduces　the　flowability　of　the　matrix　compared　to　straight　fibers　in　the　UHPC　matrix,　and　flowability　of　UHPC　decreased　significantly　with　increase　of　fiber　bending.　The　results　of　the　compressive　and　flexural　tests　showed　that　the　compressive　and　flexural　strengths　of　the　specimens　were　significantly　improved　with　the　increase　of　fiber　doping　compared　with　the　matrix　without　fiber　doping.　In　terms　of　compressive　strength,　the　curvilinear　steel　fibers　can　further　increase　the　compressive　strength　of　UHPC　by　5–8 MPa　compared　with　the　straight　steel　fibers.　In　terms　of　flexural　strength,　the　flexural　strength　of　the　specimens　doped　with　straight　fibers　was　higher　than　that　of　the　curvilinear　fiber　specimens　when　the　fiber　dosing　was　less　than　1%　by　volume　due　to　the　poor　dispersion　of　curvilinear　fibers.　However,　the　average　bonding　strength　of　curved　fibers　was　higher　than　that　of　straight　fibers,　and　the　flexural　strength　of　curved　fiber　specimens　was　better　than　that　of　straight　fiber　specimens　when　the　fiber　dosing　was　1.5　and　2.0%.　©　2023,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.