چكيده به لاتين
Schools, as one of the most critical educational and social infrastructures, play a vital role in shaping future generations. Given the devastating earthquakes such as the Bam earthquake (2003), Rudbar-Manjil earthquake (1990), and Sarpol-e Zahab earthquake (2017), the high vulnerability of buildings to seismic events, especially in high-risk areas of Iran, has raised serious concerns about school safety. Furthermore, scientific forecasts indicate a high likelihood of a severe earthquake in Tehran due to the city's location on active fault lines. These conditions emphasize the necessity of assessing the seismic resilience of schools in Tehran, as these structures must not only protect students' lives but also maintain post-earthquake functionality to prevent disruptions in the educational process.
In this study, a four-story steel school building with a total floor area of 1,390 square meters, located in the Pirouzi neighborhood of District 14, Tehran, was selected as the case study. Retrofitting was conducted by adding shear walls in the Y direction, and the seismic performance of the building was assessed before and after retrofitting using the FEMA P-58 methodology.
This research involved seismic risk analysis at three hazard levels (2%, 10%, and 50% probabilities of exceedance in 50 years), and probabilistic distributions of repair costs and recovery times for structural and non-structural components were derived. The results indicated that seismic retrofitting significantly reduced financial losses and recovery times, while improving the seismic resilience index of the structure. It was also found that the fragility functions provided by the PACT software require further development and localization to be fully applicable to Iranian buildings.
This study not only provides detailed analyses of the seismic resilience of schools but also highlights the importance of seismic retrofitting for educational buildings as part of earthquake risk reduction strategies. It offers a framework for evaluating and retrofitting similar structures across the country. The minimum resilience index was observed for the existing structure under the 2% hazard level in 50 years, with a value of 0.373, while the maximum resilience index was found for the retrofitted structure under the 50% hazard level in 50 years, with a value of 0.945.
