Abstract
Seismic response characteristics of two types of base-isolated buildings are investigated by using identification techniques. Equivalent linear system was first assumed in connection with the dynamic behavior of the structural system, then the nonlinear Bouc-Wen's model was also assumed as second stage to model the isolation system and estimate the hysteretic damping of the system. Both “modal minimization method” and “Extended Kalman Filtering techniques” are used for structural identification. The natural frequency of the isolation system of Law and Justice Center Building was designed greater than the natural frequency of the building while the natural frequency of the test building of Tohoku University was designed smaller than the natural frequency of the building. These results are obtained from identification.
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