چكيده به لاتين
Earthquakes, as a common natural disaster, has always been a serious threat to human beings, cities and infrastructures. Schools are regarded as the representative of educational centers, where students spend a lot of time. Therefore, the seismic resilience of such buildings should be guaranteed completely. In this study, in collaboration with the organization for Development, Renovation, and Equipment of Schools (DRES) in Iran a steel school building in Kermanshah city was chosen and its seismic resilience index was assessed incorporating FEMA P-58 methodology in two states of before and after retrofitting process. Lateral resisting system of the school in one direction is Eccentrically Braced Frame (EBF), and in the other direction is Concentrically Braced Frame (CBF). Due to weakness in the lateral resisting system, it was suggested that some of the braces should be replaced with stronger ones. In this study, the probability distribution of repairing time and repairing cost for different structural and non-structural components in 3 hazard levels containing 50%, 10%, and 2% in 50 years was obtained using risk analysis. These data were used to calculate the initial performance loss and the recovery process after the earthquake. By drawing functionality curves, seismic resilience indexes for the existing and retrofitted buildings in 3 hazard levels have been calculated and compared with each other. The results show that in all 3 hazard levels, an increase in stiffness after retrofitting has led to a decline in loss of drift sensitive components and a rise in acceleration sensitive components. Due to the dominance of the number of drift-sensitive components in this case study, the total damages and repairing time after retrofitting have decreased while the resilience index has negligibly increased. Moreover, implementing this methodology for the case study, indicates that existing fragility curves in the relevant Performance Assessment Calculation Tool, are not fully compatible with the structural and non-structural components of common buildings in Iran and its application for Iranian buildings requires extensive development and improvement.
