Seismic performance and reparability assessment of recycled aggregate concrete columns with ultra-high-strength steel bars

•UHSS were innovatively applied to the HSRAC columns to achieve resilient structures cast from green building materials.•Quasi-static tests of five new pattern columns were conducted to investigate the seismic performance and reparability.•By comparing the reparability limit of residual drift ratio and crack width, all resilient columns can be repaired within the 3% drift ratio.•The ideal prediction models of skeleton curve and reparability probability of HSRAC columns were proposed.