The　main　objectives　of　this　study　are,　on　one　hand　to　present　an　experimental　campaign　on　the　seismic　shear　failure　behavior　of　RC　cantilever　beams　with　transverse　reinforcement　subjected　to　low-cyclic　fatigue　loading,　and　on　the　other　hand　to　evaluate　the　possibility　of　the　existence　of　size　effect　on　the　corresponding　nominal　shear　strength　of　the　RC　beams.　Five　groups　of　geometrically　similar　RC　beams　with　cross-sectional　height　ranging　from　200　mm　to　1000　mm　and　a　shear-span　ratio　of　2　were　designed　and　tested.　Based　on　the　test　results,　the　seismic　shear　behavior　including　the　failure　patterns,　the　hysteretic　characteristics,　the　bearing　capacity,　the　ductility　capacity,　the　energy　dissipation　capacity　and　stiffness　degradation　are　explored.　Moreover,　the　size　effect　on　the　nominal　shear　strength　is　studied　and　discussed.　The　test　results　and　analyses　indicate　that,　(1)　the　failure　patterns　of　the　RC　beams　having　different　structural　sizes　are　very　similar;　(2)　under　low-cyclic　fatigue　loadings,　even　with　the　transversal　reinforcement,　the　failure　of　the　RC　beams　is　still　brittle;　(3)　with　increasing　the　structural　size　of　the　RC　beams,　the　corresponding　nominal　shear　strength,　the　safety　reserve　coefficient　and　the　ductility　capacity　decrease　pronouncedly;　(4)　the　test　data　on　the　nominal　shear　strength　is　in　good　agreement　with　Bazant＇s　size　effect　law.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.