Development and Application Example of Rotational Inertia Mass Damper

Abstract eng:
It resulted a large and long-time shaking in the high-rise buildings of Osaka plain and Tokyo metropolitan area, which made many people felt great fear by The 2011 off the Pacific coast of Tohoku Earthquake. After that, we had feared a massive earthquake in Nankai Trough. We also supposed this massive earthquake might cause serious shaking to more high-rise buildings that we never expected before. Therefore, it’s necessary to establish an effective method for upgrade the damping performance of buildings for reducing magnitude and shortening shaking time of building during earthquakes. Recently years, by rotating the spindle using a ball screw mechanism, equipment (Rotational Inertia Mass Damper) has been put into practical use large inertia mass effect resulting in several thousand to several hundred times of mass of the weight. Using this principle of rotational inertia mass damper can be greatly reduced the seismic displacement of the building compared with conventional vibration-control-devices. Rotational Inertia Mass Damper is expected to able to build vibration control system with high mass ratio for the mass of the building due to large inertia mass effect. Furthermore, this damper is possible to shorten the construction period because it has high effect of vibration-control with per damper and number of installation location can be reduced compared with conventional vibration-control-devices. In addition, this damper has an overload protector as fail-safe mechanism to cut off the power of the damper burden of an unexpected [1]. In this paper, we report the principle and application example of Rotational Inertia Mass Damper.

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