The　bolted　T-stub　connection　joining　beam　with　column　is　being　widely　applied.　To　enhance　the　energy　dissipation　capacity　of　conventional　T-stub　connections,　two　rectangular　plates　are　proposed　to　be　inserted　between　the　T-stub　and　column,　so　that　the　T-stub　flange　can　yield　both　under　tensile　and　compressive　loads.　This　study　put　forward　a　mechanical　model　of　a　new　T-stub　connection　with　inserted　plates　and　investigated　important　factors　that　could　affect　its　mechanical　behavior　through　experimental　tests.　Thirty　specimens　were　designed　with　different　configurations　that　differed　according　to　the　existence　or　absence　of　inserted　plates,　the　fabrication　method　and　the　width　of　inserted　plates.　These　configurations　were　tested　under　axial　and　cyclic　loading　conditions,　and　results　showed　that　the　proposal　aiming　to　improve　the　energy　dissipation　capacity　was　feasible.　The　mechanical　model　presented　coincided　with　the　test　observation　and　data.　The　advent　of　two　inserted　plates　elevated　the　load　bearing　capacity,　stiffness　and　ductility　of　connections　under　compression,　whereas　in　tension　the　properties　were　not　substantially　enhanced.　The　welded　T-stub　connections　outperformed　those　cut　from　standard　section　steel.　The　energy　dissipated　by　connections　with　inserted　plates　was　about　150%　of　that　by　traditional　connections　without　inserted　plates.　Only　within　a　reasonable　range　can　the　increment　of　plate　width　promote　the　energy　dissipation　capacity　of　T-stub　connections.　The　optimum　width　of　plates　in　terms　of　energy　consumption　accounted　for　around　31%　of　the　overall　width　of　connections.