The　study　investigates　the　influence　of　the　shear　performance　and　size　effects　of　reinforced　webless　RC　beams　under　the　coupling　of　the　shear-span　ratio　(λ　=　1.0,　1.5,　and　2.0)　and　the　attachment　angle　(θ　=　0°,　30°,　45°,　60°,　and　90°)　of　the　CFRP　sheets,　based　on　four-point　bending　loading　test.　The　results　show　that:　the　damage　modes　exhibited　by　the　specimens　remain　consistent　when　the　shear-span　ratios　are　equivalent;　when　the　CFRP　sheets　are　nearly　perpendicular　to　the　main　diagonal　crack,　they　have　a　stronger　effect　on　the　RC　beams,　but　they　also　weaken　the　size　effect　of　the　reinforced　beams;　the　CFRP　sheets＇　strain　quickly　increases　after　the　diagonal　cracks　show　up;　CFRP　sheet　enhances　the　shear　capacity　of　RC　beams　without　web　by　up　to　83　percent.　Finally,　we　propose　a　size　effect　formula　for　the　shear　strength　of　CFRP　sheet-reinforced　RC　beams　without　web　reinforcement,　considering　the　coupled　effects　of　the　shear-span　ratio　and　CFRP　sheets＇　adhesion　angle,　based　on　the　experimental　and　simulation　results.　©　2024　Elsevier　Ltd