Notice of RetractionIdentification and analysis of structural time-varying parameters using seismic response records

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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To track and detect the time-varying characteristics of building during small and great earthquakes, the time-varying parameters of a 5-story building are identified from its seismic response data in three earthquakes by using recursive system identification method. The results show that the time-varying modal parameters of structure can be predicted accurately from the seismic response records, and the structural parameters of buildings before and after damage can be determined from the time-varying parameters by only using records in one earthquake. The natural frequency does not change in small earthquake, but decreases gradually until it reaches the lowest point value, and then increases until the end of record in great earthquake, but it can not be recovered to the initial value when the building is damaged in earthquake. It can be concluded that the performance of structure could be recovered to a certain extent after earthquake compared with the most dangerous state when the response reaches the maximum value in earthquake. Furthermore, the damping ratio changes irregularly during the great earthquake. The results provide means for structural seismic damage detection, diagnosis and evaluation.