The effect of the friction pendulum isolation system on the seismic response of structures located on different types of soils

Conventional seismic design and reinforcement methods are based on increasing the capacity of the structure. That is, the bearing capacity of the structure is increased by increasing its strength and ductility, which is not possible in the reinforcement of many structures. However, in seismic isolation, by reducing the seismic demand, by reducing the absolute acceleration of the structure and reducing the energy input to the structure, due to increasing the Period and damping in the level of isolation, the structure can be placed in safe areas. Therefore, in this study, the effect of seismic isolators and also the height of structures on different types of soils have been investigated. For this purpose, the effects of seismic isolators in two buildings of 5 and 8 floors in three types of soil S1, S2 and S3 are investigated and evaluated. After validation of the structure and base isolation, behavioral studies were performed, and it was found that the presence of base isolation reduces the maximum displacement of the roof by up to 20% and 80% of maximum base shear in the 5-storey building. Reduction of about 40% of the maximum sliding displacement of the base isolation in the 8-story structure compared to 5 floors has reduced the effect of the base isolation on the maximum displacement in the higher floors.