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Nakaminami S.,Aseismic Devises Co. | Kida H.,Aseismic Devises Co. | Ikago K.,Tohoku University | Inoue N.,Tohoku University
Journal of Structural and Construction Engineering | Year: 2014

In this paper, we propose installing a buffer spring into a base-isolated system incorporated with a viscous mass damper as a method to reduce excessive acceleration induced by the secondary mass. We derived transfer functions of a two-degree-of freedom model on the basis of equivalent linearization method using complex stiffness model and the effectiveness of this system was examined by non-linear time history response analysis for real buildings. These results confirmed that the buffer spring as well as the damper force restriction is effective in reduction of accelerations and damper forces without deterioration in displacement reduction effect brought by the secondary mass. Source


Nakaminami S.,Aseismic Devises Co. | Kida H.,Aseismic Devises Co. | Ikago K.,Tohoku University | Inoue N.,Tohoku University
Journal of Structural and Construction Engineering | Year: 2011

This paper shows application of viscous mass damper with restriction mechanism to base-isolated structures, and its effectiveness.Damper force restriction mechanism was modeled by complex stiffness model and it shows the response characteristic of this system based on equivalent linearization method. The effectiveness of this system was examined by non-linear time history response analysis using seismic waves. These results confirmed that it is possible to apply large added mass to base-isolated structures, and that large displacement reduction effect was achieved by using damper force restriction mechanism. At this time, damper force restriction mechanism clearly showed that damping force can be controlled. Source

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