Studying the seismic response of reinforced concrete buildings using a hybrid isolation system

Abstract

Seismic isolation systems are used to reduce floor accelerations and displacements in addition to the base shear forces compared to the building without isolation. Tradi

tional rubber isolation systems are usually used, which have proven effective in raising the seismic efficiency of buildings. However, in special cases of buildings such as tall buildings and lightweight buildings, this isolation is considered It is not effective, so it was necessary to search for a hybrid isolation system that is effective in reducing the floor accelerations and displacements and the base shear forces of tall buildings. The research aims to study the effect of using hybrid systems consisting of cross linear bearings and rubber bearings in improving the seismic behavior of tall buildings under the influence of several earthquakes, using the ABAQUS program, by changing several parameters (change of building height, friction coefficient within the cross linear bearing, damping energy of rubber isolators accompaniment).The response to the isolated structure was evaluated by comparing the role, accelerations, floor displacements, and base shear forces with the structure without isolation.The results showed the effectiveness of the hybrid isolation system in reducing floor accelerations and displacements and reducing the base shear force in tall buildings, and that the change of the friction coefficient of the cross linear bearing had no effect on the response of the structure, increasing the capacity of the rubber bearing did not signifcantly affect the values of accelerations and drift ratio, on the contrary, it led to an increase in the amount of energy dissipated.