Investigating the Effect of Using a Seismic Isolation System to Improve the Behavior of Concrete Buildings with a Very High Degree of Importance and with a Double Side Bearing Resistant System

Functionally, the seismic isolation system is one of the best lateral bearing resistant systems in concrete buildings. The use of seismic isolators in the structure increases ductility, absorbs high energy, and improves the stability of the entire structure. According to Regulation 2800, the   buildings used in military and law enforcement places are considered very important buildings. Therefore, according to the principles of defense, the non-destruction of these structures and the ability to use them after severe earthquakes are important and vital. Therefore, in this study, the structural behavior of a building with police use, considering the rubber seismic isolator with   fiber-reinforced polymers (FRP) in it, in order to improve the seismic performance and prevent  destruction after the earthquake, is investigated has been This structure has been subjected to   non-linear static (overlay), non-linear dynamic, and incremental non-linear dynamic (IDA) analyses, and its fragility curve has been obtained and analyzed. The results of the parameters of structural seismic behavior obtained from the analysis of wear, time history, IDA and fragility curve; It indicates that the isolated structure has less drift than the same structure without isolator, and the stability, capacity and base shear of the isolated structure is better than the structure  without isolator. In general, for structures equipped with seismic isolators, the probability of  passing each performance level occurs later.