Structural

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A damper developed by authors uses both the mass effect by rotary inertia and the variable damping effect by magnetorheological fluid. The negative spring property by inertia mass and significant energy absorption by MR fluid are confirmed. Authors intend to carry out practical realization of rotary inertia mass damper using MR fluid. In this research, through the real-time-hybrid experiment with the use of "MR rotary inertia damper", the seismic response properties are discussed by changes in the parameters on building structure. From the knowledge obtained by the experiment, the authors propose the semi-active control method focused on input velocity of earthquake.Then, in comparison with passive control, it have been confirmed the effects of the displacement reduction in the all case of experiments performed in this research. Especially, in the case of near-fault earthquake ground motion, it have been confirmed both floor response acceleration and displacement were reduced.