Vol.25, No.2, 2025, pp. 265–275
https://doi.org/10.69644/ivk-2025-02-0265

The isolation of buildings from the powerful movement of the earth is a new method that has been highly regarded in recent decades and is one of the scientific and practical methods for reducing the earthquake-caused losses which is performed as a simultaneous reduction in the inter-story displacement and acceleration of stories. The mechanism of this method is such that with an increase in the period and damping of the structure in the seismic isolation system, the effect of acceleration and destructive energy of earthquake are reduced. Thus, it is known as an earthquake-resistant design method substituting the reinforcement of the structure's load-bearing capacity. The use of a seismic isolator means that before the earthquake force reaches the structure, it is damped and, thereby, the energy is prevented from entering the structure. The present study is aimed to investigate the difference in the response of the 3, 6, and 9-story clamped building with nonlinear (LRB) and linear (LDRB) elastomeric isolators with superstructure height variations. Each isolator is modelled with periods of 2 and 3 seconds, the results of which clearly indicate the effect of proper use of seismic isolators on the reduction of seismic response. Based on the obtained results, it is recommended to use an isolator with a constant period for concrete buildings with height changes.

Keywords: • seismic isolation system • linear isolator (LDRB) • nonlinear isolator (LRB) • time history analysis • concrete building • seismic isolator