SEISMIC PERFORMANCE OF IRREGULAR BUILDING IN PLAN USING TRIPLE FRICTION PENDULUM

Abstract

In recent Era, Vertical development of city with good aesthetic and elegant structures is more preferable so
the irregularity of buildings comes in picture. The damage to the well-designed structures caused by earthquake, has
attracted the attention of engineers to use adaptive seismic isolation system such as Triple friction pendulum bearings
(TFPBs). An adaptive seismic isolator can revelation different stiffness and damping during its performance in different
earthquake hazards level. The base isolation has been adopted as one of the most important passive control technique to
resist the earthquake forces. Triple Friction Pendulum (TFP) bearing consists of two facing concave steel surfaces
separated by an internal nested assembly of two facing concave surfaces separated by an articulated slider. In this study,
the effect of the horizontal irregularities of base-isolated structures will be demonstrated using TFPS. A reasonable
variety of superstructures with different irregularity of plan considered. Three-dimensional models of superstructures
with linear behavior mounted on nonlinear TFP isolators with various effective periods and damping are studied
elaborately. Base shear, storey drifts, base displacement, acceleration are selected as prominent responses of baseisolated structures. The analytical study is carried out with nonlinear time history analysis by SAP2000 V.17 software
with different time history. Seismic comparison of regular to irregular base-isolated building is being aim of this study.