Seismic Risk Assessment of Existing School Buildings in Egypt

In recent decades, Egypt has had high volume of investments a high density in the existing densely populated school buildings throughout Egypt. It should be noted that the buildings seismic design issued during the construction phase have been inadequate design. Consequently most of the school buildings are facing a seismic risk. In this Paper numerical development of fragility assessment curve for moment resisting frame reinforcement concrete of the existing school buildings in Egypt as the case study is presented herein. The Ambient Vibration Analysis (AVA) has provided a reliable means to evaluate the actual dynamic characteristics of the existing schools buildings, which can be concluded the actual numerical fragility curve of seismic risk mitigation. The study succeeded to present reliable fragility curves to show the peak ground acceleration for 50% probability of exceeding slight, moderate, and sever damage of ground acceleration approximating from 0.15 to 0.4 g using three real scaled time history of earthquakes Al-Aqaba occurred in 1995, Northridge occurred in 1994, and El-Centro occurred in 1940, respectively , to assess the structural seismic risk performance levels of existing Egyptian schools, for different return period earthquakes, for lives saving, repair costs, and the strengthening works after and/or pre- earthquake excitation.