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The rehabilitation of damaged buildings is a domain which remains a challenge after each earthquake. From there, several studies have been launched in this domain. The objective of this work is to achieve a rehabilitation study of an administrative building built in a low seismicity zone according to the old Algerian earthquake rules (RPA83). Moreover, after the earthquake of Boumerdes in 2003, modifications have been made to this regulation, and this zone was changed into a high seismicity zone. However, after diagnosis and various investigations, it is always hard to make a radical choice about the preferred method of rehabilitation, for this, a comparative study of the rehabilitation of the building will be performed by proposing two models of bracing members, knowing that the first model concerns the strengthening by adding new reinforced concrete shear walls and the second is about the integration of new steel braced frames. Finally, we will highlight the performance of the proposed solutions for the strengthening by nonlinear static analysis. The results obtained in terms of capacity curve and performance point showed a large performance of the structure by the two proposed reinforcing models.
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