This　paper　puts　forward　a　kind　of　steel-RPC　composite　deck　with　a　smooth-plate　shear-force　connector.　The　structure　can　not　only　solve　asphalt　pavement＇s　disease　of　a　steel　bridge,　but　also　can　improve　the　deck＇s　lateral　stiffness,　being　help　for　easing　the　stress　concentration　and　fatigue　cracking　at　the　place　of　U　rib　stiffeners.　Based　on　this　structure,　a　push-out　test　for　smooth-plate　shear-force　connectors　was　conducted.　6　specimens　were　divided　into　two　groups　by　the　connectors＇　thickness　of　4mm　and　10mm.　The　test　inspected　the　thickness＇s　impact　on　shear　bearing　capacity　and　failure　mode.　The　results　show　that　the　root　of　the　connector　will　be　yielded　in　tension　when　the　connector　is　thin,　that　RPC　under　the　connector　is　crushed　when　the　connector　is　thick,　and　that　the　working　mechanism　is　similar　to　that　of　steel　fittings.　Comparing　a　10mm　thickness　connector　with　a　4mm　thickness　one,　the　bearing　capacity　is　improved　43.6%,　the　stiffness　of　shear　is　improved　35%,　and　ductility　decreased　slightly,　but　two　sets　of　test　piece＇s　ductility　factor　are　both　greater　than　3.5.　Finally,　a　simplified　formula　for　smooth-plate　shear-force　connector＇s　shear　bearing-capacity　is　given,　and　the　calculation　result　is　more　secure　than　test　results,　which　can　provide　a　reference　for　the　design.　©　2017,　Engineering　Mechanics　Press.　All　right　reserved.