Seismic Response Assessment of Resilient Reinforced Concrete Shear Wall with Buckling-Restrained Brace

Reinforced-Concrete Shear Walls (RCSWs) are well known as a common the lateral resisting system, particu-larly in mid and high-rise structures, owing to their favorable attributes such as relatively high ductility and in-plane stiffness. Although RCSWs have demonstrated commendable seismic performance in past earth-quakes, they suffer from a critical disadvantage, i.e., concrete crushing at the wall's base and consequent buckling of the reinforcement, resulting in challenging and sometimes infeasible post-earthquake repairs. This study investigates a potential solution to address this issue by incorporating Buckling-Restrained Braces (BRBs) as boundary elements at the base of RCSWs. To evaluate this approach, two sets of structures were designed: one employing conventional RCSWs, and the other implementing RCSWs with BRBs as boundary elements (RCSW-BRB). The case study structures are consisted of ۶ and ۱۲-storey configu-rations. To compre-hensively assess the seismic response of these structures, various analyses were conducted, including static (mono-tonic and cyclic), Dynamic Nonlinear Time History (NLTH) analyses, and Incremental Dynamic Analyses (IDA). The results indicate a notable improvement in structural performance with the adoption of the RCSW-BRB system. Additionally, the response modification factor increased from ۴.۴ in conventional RCSWs to ۵.۵ in RCSW-BRB configurations, signifying enhanced seismic performance. Moreo-ver, the proposed system effectively mitigates damage at the foot of the RCSW by employing replaceable BRBs as sacrificial elements, thus enhanc-ing the structure's overall resiliency.

کلیدواژه ها:

Reinforced-concrete shear wall ، Buckling-restrained brace ، Seismic Performance ، seismic resilience ، Structural response ، seismic analysis ، Post-earthquake repair ، Nonlinear time history (NLTH)