A STUDY AND DEVELOPMENT OF SEMI-ACTIVE CONTROL METHOD BY MAGNETORHEOLOGICAL FLUID DAMPER IN BASE ISOLATED STRUCTURES

摘要

The semi-active damping devices can vary their damping characteristics without large power source, and can improve seismic response of building. MR damper (magnetorheological fluid damper) is one of the suitable devices for semi-active seismic response control of structures. The purpose of this study is to develop a simple and effective semi-active control method to reduce seismic response of base isolated structures by MR damper. Proposed method is only based on the response displacement of isolated story, and attempt to reduce response displacement of isolated story and acceleration to superstructure. By applying this control method, the displacement and acceleration response can be reduced with relatively smaller damper force.