To　study　the　load　carrying　behaviour　of　column　connections　in　multi-and　high-rise　steel　structures　under　the　combination　of　tension,　bending　moment　and　shear,　full-scale　model　tests　and　finite　element　analysis　were　performed　on　four　bolted-flange　connection　specimens　with　different　flange　thicknesses.　The　influence　of　axial　tension　ratio　on　the　performance　of　the　connection　was　analyzed　by　finite　element　analysis.　The　results　show　that　the　lateral　rigidity　and　horizontal　bearing　capacity　of　the　connection　increase,　and　at　the　mean　time　the　prying　force　between　the　flange　surfaces　of　the　connection　tension　zone　decreases　as　the　flange　thickness　increases.　Under　the　combination　of　tension,　bending　moment　and　shear,　the　neutral　axis　of　the　flange　is　near　the　second　row　of　bolts　on　the　compression　side,　and　the　position　of　the　neutral　axis　gradually　moves　from　the　compression　zone　to　the　centroid　of　the　flange　as　the　flange　thickness　increases.　The　action　effects　of　the　axial　tension　and　the　horizontal　force　led　on　the　connection　are　in　the　same　direction.　The　horizontal　yield　load　of　the　connection　is　reduced　due　to　the　existence　of　the　axial　tension,　and　the　flange　rotation　angle　increases　with　increase　in　axial　tension　ratio.　©　2018,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.