Abstract
In the great east Japan earthquake of 2011, resonances of high rise structures as a consequence of a long period ground motion has been reported. The long period ground motion had a predominant period of from a few seconds to ten seconds. Additionally the duration time of the long period ground motion was more than a few minutes. Various viscous dampers have been proposed and applied to actual structures to suppress vibration response. However the vibration control performance decreases with the long duration time, because of a temperature rise of the viscous material. Therefore there is concern that these viscous dampers can not suppress vibration response in case of the long period ground motion. In order to solve this problem, the authors propose a viscous-friction damper in series. In this hybrid damper, the friction damper can absorb vibration energy as well in case of the long period ground motion. As a result, the temperature rise of the viscous material is suppressed, and the damper retains good performance. In this paper, seismic response analysis and component tests are conducted in order to confirm the fundamental performance and behavior of the hybrid damper.
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