In　this　study,　a　plug-in　plate　blind-bolted　joint　and　double-splint　blind-bolted　joint　are　proposed　for　square　steel　tube　columns.　The　seismic　performance　of　joints　under　bending-shear　combination　was　studied　via　experiments　and　finite　element　simulations.　Four　test　specimens　of　plug-in　plate　blind-bolted　joint　and　double-splint　blind-bolted　joint　were　studied　by　varying　the　numbers　of　bolts　used　in　the　connection.　Additionally,　eleven　joints　with　different　thicknesses　of　the　plug-in　plate,　the　double-splint,　and　the　column　wall　were　compared　via　finite　element　simulation.　The　strength　of　the　test　specimens　increased　till　the　loading　was　stopped　at　0.05　rad.　This　suggests　that　the　specimens　had　good　ductility　and　rotation　ability.　The　effect　of　the　number　of　bolts,　thickness　of　the　plug-in　plate　and　double-splint　on　the　rotational　stiffness,　slip　resistance,　ductility　performance,　energy　dissipation　capacity,　ultimate　load-bearing　capacity,　and　yielding　mechanism　of　the　joint　were　analyzed.　Additionally,　simplified　equations　were　derived　for　slip　resistance　and　yield　strength　of　the　joints.　The　values　obtained　using　these　equations　agreed　well　with　that　of　the　experiment　and　finite　element　analysis.　Furthermore,　four　frames　with　the　plug-in　plate　blind-bolted　joint　and　double-splint　blind-bolted　joint　for　square　steel　tube　columns　were　subjected　to　cyclic　loads.　Their　seismic　performance　was　found　to　be　better　than　that　of　the　frame　without　the　column　joint.　The　proposed　blind-bolted　joints　can　be　used　for　splicing　a　column　at　mid-height.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.