Document Type : Research Article
Authors
1
Graduated M.Sc. in Earthquake Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
2
Associate Professor, Natural Disasters Prevention Research Center, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
3
Professor, Natural Disasters Prevention Research Center, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
4
Assistant Professor, Structural Hybrid Simulation Research Lab, Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
5
Graduate Student, School of Civil Engineering, Semnan University, Semnan, Iran.
Abstract
Earthquake, 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 performance 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 risk was assessed incorporating FEMA P-58 methodology in two states of before and after retrofitting process. The 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. 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 negligibly decreased.
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