Passive Control of Structures Using Triple Friction Pendulum System

Abstract

Background: Among the base isolation systems used, friction base sliding isolation systems has been successfully implemented on field at many places. The currently available friction pendulum isolators can be designed for a specific level of ground shaking, which may prove ineffective in case of severe hazard levels. The triple friction pendulum system exhibits adaptive behaviour and imparts a greater amount of flexibility to the designer for various levels of earthquake shaking. newline newlineAim: To evaluate the behaviour of triple friction pendulum (TFP) isolator for ground motion having different hazard levels and displacement characteristics like far-field, near-fault ground motion with forward directivity and fling step effect for multi-storied buildings and bridges. newlineMethod: The seismic response of structure-isolation system is simulated by solving governing equations of motions using computer programme developed. Due to nonlinear force-deformation behaviour of the TFP bearing and significant difference in damping of superstructure and the isolation system the governing equations of motion of the base-isolated structure are solved in the incremental form using Newmark s stepby-step method assuming linear variation of acceleration over small time interval, and#61508;t in this study. For the hysteretic model, the incremental hysteretic displacement components for each time step are obtained by solving the first-order differential equation by a fourth-order Runge-Kutta method. newline