CONTROLLABLE FRICTION DAMPER USING PIEZOELECTRICACTUATORS FOR SEMI-ACTIVE SEISMIC ISOLATION SYSTEM

摘要

A semi-active seismic isolation system using a controllable friction damper was developed to decrease therelative displacement between the ground and a superstructure. Performance of the controllable frictiondamper is hampered, however, when the controller and the actuator malfunction during a largeearthquake. In this study, a new controllable friction damper, using dependable piezoelectric actuators, isproposed as a solution. This damper has a fail-safe mechanism enabling the system to demonstrate adamping effect during malfunctions. This paper outlines the simulation results for the seismic isolationeffect, and the relative displacement reduction effect of a semi-active seismic isolation system using thecontrollable friction damper, and also reports the results of excitation tests for a semi-active seismicisolation system using this controllable friction damper.