In　this　work,　a　displacement-amplified　torsional　damper　(DATD)　is　proposed　for　improving　the　seismic　capacity　of　the　beam-column　joints　of　a　frame　structure.　The　proposed　DATD　uses　common　steel,　lead,　and　high-damping　rubber.　This　damper　exhibits　good　energy　dissipation　under　small　earthquakes.　Under　strong　earthquakes　and　large　displacements,　the　strengthening　of　the　high-damping　rubber　can　improve　the　overall　stiffness　of　the　damper　and　increase　the　energy　dissipation.　In　order　to　investigate　the　performance　of　the　proposed　DATD,　theoretical　analyses,　simulations,　and　cyclic　loading　tests　were　performed,　and　their　results　were　compared,　showing　an　overall　good　agreement.