Seismic Retrofitting of Dual Structural Systems—A Case Study of an Educational Building in Croatia

On 29 December 2020, a devastating Mw6.4 earthquake struck near the town of Petrinja, Croatia. The main was preceded by Mw4.9 foreshock day before. earthquakes caused extensive damage to buildings, especially historic buildings made unreinforced masonry but also other typologies and critical infrastructure. Today, recovery efforts in Croatia focus primarily on reconstruction seismic retrofitting. Family homes public, cultural, educational, facilities are top priorities. In this paper, comprehensive study existing building educational sector is presented as case study. performance evaluated using numerical methods, first for as-built condition then retrofitted building. For each condition, collapse mechanisms were determined structural elements identified. retrofit strategy dual system consisting RC frame walls aims reduce displacements level sufficient prevent early brittle failure concrete. Additionally, discrepancies when different modelling approaches discussed.