Device uncertainty propagation in low?ductility RC frames retrofitted with BRBs for seismic risk mitigation

Passive control systems, such as buckling-restrained braces (BRBs), have emerged efficient tools for seismic response of new and existing structures by imparting strength stiffness to buildings, while providing additional high stable energy dissipation capacity. Systems equipped with BRBs been widely investigated in literature; however, only a deterministic description the BRBs’ properties is typically considered. These are provided manufacturer successively validated qualification tests according code-based tolerance limits. Therefore, device introduced within structure could differ from their nominal design estimates, potentially leading an undesired performance. This study proposes probabilistic assessment framework evaluate influence uncertainty on retrofitted RC frame. For case study, benchmark three-story moment-resisting frame considered where defined compatible standardized limits devices’ quality tests. implemented through two-level factorial strategy Latin hypercube sampling technique. Cloud analysis demand models used develop fragility functions bare four damage states also accounting property BRBs. Risk estimates evaluated three regions. The results show that, structure, these uncertainties lead increase up 21% variation risk 56%.