Seismic Retrofit of an Existing Reinforced Concrete Building with Buckling-restrained Braces

Background: The seismic retrofitting of frame structures using hysteretic dampers is a very effective strategy to mitigate earthquake-induced risks. However, its application in current practice rather limited since simple and efficient design methods are still lacking, the more accurate time-history analysis time-consuming computationally demanding. Aims: This paper develops applies retrofit method complex real case study: An eight-story reinforced concrete residential building equipped with buckling-restrained braces. Methods: permits peak response be predicted, as well added structure obtain uniform distribution ductility demand. For that purpose, pushover first mode load pattern carried out. corresponding story curves idealized degrading trilinear model then used define SDOF (Single Degree-of-Freedom) system equivalent RC frame. system, damped braces, designed meet performance criteria based on target drift angle. optimal damper rule distribute braces along elevation maximize use all Results: effectiveness finally demonstrated by non-linear set earthquake ground motions various hazard levels. Conclusion: results proved procedure feasible it achieves objectives damage control structural members demand dampers.