カルマンフィルタを用いた多入力系の入力地震動の推定

Abstract

We report a procedure by which input ground motions of multi-input systemare identified from stuctural parameters and measured responses. We usually areinterested in estimating the response of a structure or its foundation, however, thereis much uncertainty as to the contact point between the soil and a structure.Kalman filter analysis, a method that updates the estimated value at each time stepby incorporating new observation date, is used in ous procedure. To verify theeffectiveness of this procedure, we have simulated the responses of three kind ofsystems (linear one-degree-of-freedom, bilinear one-degree-of-freedom, and multi-degree-of-freedom system) and made estimations using the simulated responses asobserved records. The estimated input accelerograms are in good agreement withthe orginal ground motion. We have applied this procedure to the observation daterecorded at Kawasaki on the 1980 Izu East-offshore Earthquake.