Seismic Transient Change Of Natural Frequency Estimation by Adaptive Filtering Scheme

Abstract eng:
A new system identification procedure, named as “Adaptive Forward-Backward Kalman Filter (AFB-KF)”, is developed to estimate natural frequency transition of a building that exhibits time-varying nonlinear behavior during a strong earthquake. Such natural frequency transition changes with seismic damage level of a building; therefore the natural frequency estimation by the AFB-KF is useful to detect the occurrence of seismic damage of the building. This paper presents theoretical background of the system identification procedures proposed herein, and discusses its effectiveness based on numerical simulations and two real lives monitoring of existing buildings. According to the system identification, it is shown that the first natural frequency of the building clearly decreased during the main shock of the earthquake. Therefore it is expected that structural health monitoring is possible by evaluating natural frequency transition during an earthquake based on the AFB-KF.

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