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Most previous studies for finding optimal design parameters of a tuned mass damper(TMD) have been focused on the harmonic excited single-degree-of freedom system. In this study, optimal values of damping ratio and tuning frequency ratio of a TMD applied to control a seismically excited structure are investigated through numerical analyses. Considering that the structural responses due to earthquake loads are strongly dependent on the soil condition, the site effects on the optimal parameters of the TMD are studied and compared to those presented by previous studies. Numerical analyses results indicate that better control performance can be obtained by using the parameters proposed by this study in the seismic application of the TMD. Key Words : Tuned Mass Damper, Optimal Design, Numerical Analysis, Performance Index, Soil Condition *  : (koosin@tu.ac.kr) 11 10 31  11 11 08  11 11 10 1.          , (Tuned Mass Damper, TMD) , ,   ,   (  1 )        ,       ,           [1].        TMD     Hartog         [2], Warburton      [3].       ,             ,    . Tsai Lin TMD           [4],  Kareem Kline[5], Verdirame Nayfeh[6], Zuo Nayfeh[7], Li Ni[8]      TMD      . Sadek    TMD

Investigation on Seismic-Response Characteristics and Optimal Design Parameters of Tuned Mass Damper Considering Site Effects