The　pseudo-static　test　was　conducted　to　investigate　the　seismic　behavior　of　earthquake-damaged　precast　concrete（PC）　frame　structures　（the　earthquake-damaged　frame　structures　are　within　moderate　damage）　strengthened　with　buckling-restrained　braces（BRBs）　and　to　analyze　the　hysteretic　energy　dissipation　of　BRBs.　A　half-scale　PC　frame　structure　was　fabricated.　After　it　was　pre-damaged　by　quasi-static　loading，it　was　strengthened　with　BRBs，and　then　tested　under　pseudo-static　loading　again.　The　structural　experimental　phenomena　and　failure　characteristics　were　observed　and　recorded.　The　structural　seismic　behavior，including　bearing　capacity，ductility，and　energy　dissipation，was　evaluated.　The　test　results　show　that　after　repairing　with　BRBs，the　bearing　capacity　and　energy　dissipation　can　be　significantly　improved　（the　ultimate　bearing　capacity　and　energy　dissipation　increased　by　51.3%　and　68%，respectively），　other　seismic　behavior　like　the　ductility　coefficient　can　be　recovered　well　（ductility　coefficient　restored　to　88%　of　the　initial　ductility　of　the　structure）；the　earthquake-damaged　PC　frame　structure　strengthened　with　BRBs　under　pseudo-static　loading　exhibited　a　failure　mode　of　beam-hinge　with　BRBs.　The　earthquake-damaged　PC　frame　structures　still　had　retrofit　value　and　that　the　above　retrofitting　method　was　effective.　©　2022　Editorial　Board　of　Jilin　University.　All　rights　reserved.