Buildings seismic functionality assessment

In the last decades, the seismic resilience assessment has increasingly interested stakeholders in the field of disaster risk reduction. Several approaches have been suggested to assess and improve community resilience to disasters; however, the quantification of the structures and infrastructures resilience remains insufficient. In this paper, the capacity of buildings to continue functioning after an earthquake was assessed. This resilience was determined in terms of economic losses and in terms of recovery time to return to the functionality situation of the building before the disaster. The damage level was used as the first indicator for calculating the seismic resilience index. The damage level was derived from empirical fragility curves for the different buildings typologies existing in Algeria. The economic loss factor was determined according to the damage levels caused to the structures. Subsequently, medium building functionality curves were developed, for five damping levels: strong, good, medium, weak and poor. These functionality curves will allow us to better understand the time needed for damaged structures to return to initial situation. The developed method was applied to the Blida city, which is located in a high seismic zone according to Algerian seismic regulations RPA 2024. Three buildings typologies masonry, reinforced concrete and steel were considered for a total number of 42,963 structures. For this purpose, a database was developed and incorporated into the geographic information system (GIS) tool and simulate the seismic resilience buildings. According to the results found, the old districts of the Blida city, in which buildings have a poor damper to disaster, will take much time to back to the total functionality. The other districts built later, after the application of the first Algerian seismic regulations in 1981 will have respectively weak to good functionality.