2nd Croatian Conference on Earthquake Engineering 2CroCEE

The potentially high vulnerability and poor performance of the existing buildings, after past seismic events, including exploitation period has raised awareness of the need to improve their seismic performance. Repair and strengthening gives a new life to existing or ageing structures that might otherwise be demolished and replaced.
This paper will address the issues related to repair and strengthening techniques for the first category building in Skopje, N Macedonia dated from 1924. Structural and nonstructural damages were observed due to the inappropriate foundation and maintenance of the building, which have increased during exploitation period and seismic actions. In order to define the stability of the building, non-destructive tests were applied for definition the material characteristics, further used in the numerical analysis. Based on the performance assessment, retrofit schemes were proposed to address the main structural deficiencies and to meet national code requirements in N. Macedonia.
Тhe results of the overall investigations and analyzes for the capacity of the building are presented in this paper. Also summarized are the necessary structural interventions to ensure the necessary stability and reliability of the building for gravitational and seismic actions in accordance with the existing legislation in the Republic of North Macedonia. Since it is a first category, the dynamic response of the structure to real seismic actions, expected at site, is also considered according to the valid legislature which defines assessment of seismic force considering local soil conditions.
The outcomes from this project indicate the efficiency of the retrofit options utilized in reducing both the economic losses and collapse vulnerability of the building.