This　paper　studies　the　shear　behavior　of　U-shaped　steel-concrete　composite　beams　(USCCBs),　which　include　eight　full-scale　beam　specimens　with　different　loading　directions,　loading　positions,　and　shear　span　ratios.　The　USCCB　is　composed　of　reinforcing　bars,　encased　concrete,　U-shaped　steel　plate,　headed　studs,　and　novel　dumbbell-shaped　connectors.　The　three-point　loading　tests　were　carried　out　to　confirm　the　shear　failure　mode　and　force-transfer　mechanism　of　a　concentrated　load.　The　diagonal　compression　failure　of　encased　concrete,　welding　fracture　and　local　buckling　of　U-shaped　steel　plate,　and　cracking　and　spalling　of　concrete　slab　were　observed　in　the　experiments.　The　displacement　ductility　factor　of　eight　specimens　was　between　1.55　and　3.61,　and　a　rapid　drop　of　the　load　did　not　occur　in　this　study.　The　concrete　slab　reached　ultimate　compressive　strength,　the　U-shaped　steel　plate　mainly　reached　yield　strength,　and　the　steel-concrete　relative　slip　or　separation　did　not　occur　before　the　load　reached　peak　value.　The　loading　direction　and　shear　span　ratio　have　more　effect　on　the　bearing　capacity　of　specimens.　The　novel　connector　controls　the　buckling　range　of　the　steel　plate,　but　it　has　less　effect　on　the　bearing　capacity.　The　transfer　path　of　the　shear　load　was　measured　and　analyzed　by　strain　data,　and　the　included　angle　was　between　33.5　degrees　and　49.2　degrees.　The　calculation　method　of　shear　capacity　for　USCCB　specimens　was　proposed,　and　the　average　ratio　of　calculation/test　was　1.04.