To　improve　shear　capacity,　as　well　as　reduce　on-site　casting　and　steel　consumption,　a　novel　Y-shaped　perfobond　rib　(Y-PBL)　shear　connector　with　ultra-high-performance　concrete　(UHPC)　grout　was　proposed.　The　shear　behavior　of　the　Y-PBL　shear　connector　was　investigated　by　six　groups　of　pushout　specimens.　Their　failure　modes,　load-slip　curves,　load-separation　curves,　strain　analysis,　and　shear　transfer　mechanisms　were　discussed.　Subsequently,　finite-element　analysis　(FEA)　models　were　established　to　study　the　effect　of　parameters　on　the　shear　behavior　of　the　Y-PBL　shear　connector,　as　well　as　to　compare　the　shear　capacity　contributions　with　straight-shaped　PBL　(S-PBL)　shear　connectors.　Analytical　models　were　proposed　to　predict　the　shear　capacity　of　the　Y-PBL　shear　connector.　The　results　reveal　that　the　proposed　Y-PBL　shear　connector　has　superior　shear　capacity　and　stiffness.　The　contribution　of　the　perforating　rebar　is　minor　compared　with　the　end-bearing　effect　of　UHPC.　The　analytical　predictions　agree　well　with　the　experimental　and　FEA　results.　This　study　can　be　used　to　guide　the　design　and　application　of　the　Y-PBL　shear　connector　in　steel-concrete　composite　bridges.　©　2024　American　Society　of　Civil　Engineers.