ABSTRACT

Research studies on seismic safety enhancement of structural systems by base isolation and dynamic control techniques at the Earthquake Engineering Laboratory, School of Civil Engineering, Kyoto University are introduced. Passive, active, and hybrid control methods are major subjects of research. In the first part, substructured computer-actuator hybrid loading tests of high-damping rubber seismic isolators are introduced. By this testing method, it has become possible to estimate directly how seismic isolators suppress earthquake response of structural systems, which is one of the best verification tests for earthquake loading. In the second part, phase-adjusted active control of structures under stochastic base excitation is investigated. The effectiveness of the phase-adjusted active control law including identification of ground motion is demonstrated with a numerical simulation. The results show that the proposed control law brings considerable control force reduction compared with the feedback control for the same level of response reduction in both cases.