免震・制振(2)

[I-193] A new vibration control device reducing structural response against pulse-like ground motions and its application to past earthquake records

〇Kodai Kato¹, Sumio Sawada², Akira Igarashi² (1.KYOTO University, 2.Disaster Prevention Research Institute, KYOTO University)

Keywords:Amplification mechanism, Tuned Mass Damper, Pulse-like ground motions, Maximum displacement, Passive vibration control

To cope with earthquake vibration, tuned mass damper (TMD) ideally requires a large mass, which is difficult to achieve due to design constraints. Also, TMD has a weak damping effect against pulse-like ground motions. In 1996, Kaneko et al. proposed powerful TMD (PTMD) which amplifies the displacement between TMD and target structure, adding an effect similar to increase in mass. However, the performance of PTMD with pulse-like ground motions has not been studied. In this study, we propose a TMD with reverse displacement mechanism (RTMD), amplifying the displacement in opposite direction to PTMD. The results show that RTMD has a greater effect on reducing pulse-like ground motions than TMD and PTMD.