Performance Comparison of Passive Energy Dissipation Systems in Structural Applications – II: Nonlinear Reference System

Abstract

In this paper, performance comparisons of representative passive energy dissipation devices when applied during the yielding phase of a structure are made. First, a single-degree-of-freedom nonlinear system is taken as the reference system and performance criteria are discussed according to its random response characteristics. Then, based on nonlinear random response analysis and equivalent stiffness and damping analogy, an equivalent linear model for the reference system without the energy dissipators and an equivalent unified model for the system with the dissipators are presented, by which the equivalent stiffness deterioration factor of the system with or without the energy dissipators and the dissipated hysteretic energy ratio of the dissipator to the reference system can be obtained. Finally, the performance criteria, including the reduction ratio of the controlled and uncontrolled displacement and absolute acceleration, the equivalent stiffness deterioration factor, and the dissipated hysteretic energy ratio are established for the reference system with the energy dissipators.