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The method for evaluation of the building structure response reduction by soil structure interaction (SSI) from the seismographs of soil-structure system is presented. In the proposed method, the simplified SSI model is employed, and the parameter of model is determined by system identification. In the system identification, both the inertial interaction (II) and kinematic interaction (KI) are considered. It is also presented the method to indicate the reduction of structure response by II and KI respectively. The proposed procedures are applied to the observed records of the 2011 off the Pacific coast of Tohoku Earthquake. It is clarified that the reduction effect of II is decreased when the response of super structure enters inelastic range, and the opposite is true. In the building structures with pile foundations the reduction effects of KI is relatively smaller than those of II.

REDUCTION EFFECT OF BUILDING STRUCTURE RESPONSE BY DYNAMIC SOIL-STRUCTURE INTERACTION EVALUATED FROM OBSERVED STRONG MOTION