Blind Source Separation Based Dynamic Parameter Identification of a Multi-Story Moment-Resisting Frame Building under Seismic Ground Motions

This paper addresses the application of blind source separation technique for identifying dynamic parameters of a seismic-excited multi-story building from its measured response. The structure was an instrumented moment-resisting frame office building. Its acceleration responses at different building floors were recorded during four earthquakes occurred in 2002. In this study second order blind identification - a class of blind source identification technique - was employed to obtain the structure's dynamic parameters, i.e., natural frequency and damping factor. The results of this study were substantiated through comparison with the results of investigations carried out for dynamic parameter identification of the same building using different techniques. Results of this study were encouraging. It indicated that the methodology employed in this study could be beneficially applied for identifying dynamic parameters of the building under seismic ground motions.