Evaluation of vulnerability of popular type of Kermanshah concrete school using nonlinear analysis and seismic fragility curves

Schools and buildings with educational uses are considered as important buildings in most of the design regulations due to their large population. According to the Iranian Earthquake Regulations, these buildings with any type of structural system, must be designed in such a way that they have at least a level of safety performance against severe earthquakes. Concrete schools in Kermanshah province have a significant frequency due to economic considerations, availability of materials and proper execution speed. Meanwhile, a special type of these schools has been executed with great frequency in most cities of Kermanshah province. On the other hand, in the study of educational spaces after the November 2017 Sarpol-e-Zahab earthquake in Kermanshah province, several cases of structural and non-structural damages have been observed in schools. For this reason, in this study, the seismic performance of this type of schools, under the influence of possible earthquakes, as well as their vulnerability are evaluated by nonlinear static analysis methods and increasing dynamic analysis (IDA). Then, by performing nonlinear static analysis, the envelope curve of the structure is extracted and important parameters such as ductility and the coefficient of behavior are calculated. Moreover, by performing the IDA for this type of schools, the failure curves subjected to various records in comparison with the increasing acceleration are presented and studied. The results show that the behavior and vulnerability of this structure are different according to the type of site and different records of near and far zones of the earthquake. Also, the structure of this school has an acceptable performance despite the irregularity in the plan.