Abstract
We had clearly shown in our previous research paper that semi-active seismic isolation systems with the controllable friction damper using the piezoelectric actuators, reduce response accelerations and displacements, when compared with the results of the passive systems. However it is difficult to apply this controllable friction damper to large structures, because super large piezoelectric actuators and large amplifiers are needed to drive the friction mechanism. For this reason, a new controllable friction damper using a hydraulic pump driven by giant magnetostrictive actuators was developed to solve this problem in this particular study. This hydraulic pump can make quick responses, when driven by the giant magnetostrictive actuators. It is also possible to make the hydraulic system easily enhance the capacity of the friction damper. Characterization experiments of the new controllable friction damper and excitation tests of the semi-active seismic isolation system with this new controllable friction damper were conducted. The results of these tests confirmed the effectiveness of this semi-active seismic isolation system with the new controllable friction damper.
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