粘性減衰とばね剛性の並列型（M-CK型）D.M.同調システムの応答性能に関する研究

<p> In the wake of major earthquakes such as the 1995 Hyogo-ken Nanbu Earthquake and the 2011 off the Pacific coast of Tohoku Earthquake, it becomes very important how to design response control structures. In many cases, the response control of buildings such as winds or earthquakes mainly adding stiffness elements or adding damping elements to absorb vibration energy. On the other hand, in recent years, a device that generates an inertial resistance according to the relative acceleration between two mass points has been proposed, and a response control design using an apparent "dynamic mass (D.M.)" is possible. In the past research, there are two types of design methods using the dynamic mass (D.M.): “Mode control” and “Tuned mode control”. In this paper, we propose the M-CK type tuned dynamic mass system based on “Tuned mode control” and aim at the establishment of a more efficient response control structure.</p><p> </p><p> The findings obtained from this paper are shown below.</p><p> (1) We theoretically derived M-CK type optimal design formulas based on fixed point theory and complex eigenvalue problem. Since optimal design formulas are relational formula of natural periods, it can be applied to a multi-DOF system model analysis model by using complex eigenvalue analysis.</p><p> </p><p> (2) In the multi-DOF system model using the M-CK type, it was found from the results of complex eigenvalue analysis that viscous damping was imparted not only to the mode-tuned 1st mode but also to higher modes. In addition, it was shown from the amplification factors that there was an effect of reducing the response of the higher modes.</p><p> </p><p> (3) The outline of the vibration test using the 8-story shear model and the results were shown. In the case of sine vibration testing, the result of the relative displacement amplification factors confirmed that the response of the higher modes was reduced by the M-CK type, and that the analytical values and the experimental values generally corresponded well. In addition, in the case of ground motion vibration testing, the effect of reducing the maximum response acceleration by the M-CK type against the non-seismic model was also experimentally verified.</p><p> </p><p> (4) By using optimal design formulas and the optimal design method of the M-CK type proposed in this paper, it can be applied to full-scale buildings such as high-rise buildings. It was also shown that a more efficient control structure could be constructed.</p><p> </p><p> As future developments, we will show an example of studying the optimal placement position and higher order modes control of the M-CK type. Furthermore, we show the response control effect of the combination of different tuned dynamic mass systems of the MC-K type and the M-CK type, and examine the possibility of constructing more efficient response control structure.</p>