Effectiveness of Active Control of Base Isolation System Subjected to Near-Fault Pulse Ground Motions Based on Shaking Table Experiments

Abstract

To achieve a high degree of continuous use of buildings in the aftermath of a large earthquake, research has been undertaken to examine semi-active controlled base isolation systems. However, response reduction has been difficult for near-fault pulse ground motions. This study investigates an active base isolation system that provides active control force to the base isolation structure against these near-fault pulse ground motions. To confirm the response absolute displacement and absolute acceleration of the superstructure, shaking table tests and numerical analysis were conducted. As a result, it was possible to reduce significantly the absolute displacement and absolute acceleration of the superstructure of the base isolation structure by using active control even for near-fault ground motions.