The　moment　frames　that　consisted　of　prefabricated　concrete　beams　and　columns,　which　were　linked　by　the　unbonded　post-tensioning,　have　been　proposed　for　multi-story　buildings.　However,　their　lower　structural　strength　and　stiffness　limited　the　applicability　of　their　systems　in　the　earthquake-prone　areas.　Curved　steel　braces　were　proposed　in　this　study　to　improve　the　structural　performance　of　the　post-tensioned　precast　reinforced　concrete　(RC)　beam-column　joints,　along　with　four　joint　specimens　consisting　of　braces　with　different　cross　section　height　and　eccentricity　were　tested　under　the　reversed　cyclic　loads　while　the　parametric　analysis　was　also　carried　out　using　the　finite　element　analysis　(FEA)　model.　Also,　the　failure　mode,　strength,　stiffness,　and　energy　dissipation　were　analyzed.　Based　on　the　results,　the　whole　joints　have　a　stable　mechanical　behavior　with　an　inter-story　displacement　angle　of　5%,　concrete　crushing　at　the　end　of　the　beam,　and　a　bending　yield　of　curved　braces　form　the　failure　mode.　The　curved　steel　braces　could　provide　good　strength,　stiffness,　and　energy　dissipation　for　the　precast　joints　and　these　features　of　the　joints　could　gradually　increase　with　the　expansion　of　the　brace　section　height　and　the　reduction　of　the　brace　eccentricity.　The　equivalent　viscous　damping　coefficient　at　4%　inter-story　displacement　angle　ranged　from　0.12　to　0.2,　which　was　two　to　three　times　higher　than　the　general　post-tensioned　precast　RC　joints.　When　the　eccentricity　of　the　curved　steel　brace　was　less　than　0.3,　the　joint　strength　was　greatly　impacted　by　the　eccentricity　and　changed　a　bit　when　it　was　greater　than　0.3.　The　results　showed　the　practical　feasibility　of　the　post-tensioned　frames　with　curved　steel　braces.