Structural Monitoring and Maintenance

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Unscented Kalman filter approach for tracking physical and dynamic properties of structures: Validation for multi-story buildings under seismic excitation

  • Gaviria, Carlos A. (Civil Engineering Program, Facultad de Estudios a Distancia, Universidad Militar Nueva Granada) ;
  • Montejo, Luis A. (Department of Engineering Sciences and Materials, University of Puerto Rico at Mayaguez)
  • Received : 2020.10.16
  • Accepted : 2021.05.21
  • Published : 2021.06.25
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Abstract

An improved unscented Kalman filter approach is implemented to estimate induced displacements and changes in structural properties (stiffness, frequencies and damping) during the forced dynamic response of multistory buildings to seismic excitations. The methodology is validated using a fiber-based nonlinear model of a 4-story 4-bays reinforced concrete (RC) frame building subjected to a set of earthquakes causing different levels of inelastic demand on the structure. The variation of the dynamic properties is successfully estimated by iterative updating the filter parameters. The estimated peak values of stiffness and damping reached during the seismic excitation agree with peak inelastic demand values and seem appropriate for detection and damage diagnosis of RC structures.

Keywords

Acknowledgement

This research is supported by the National Science Foundation Grant No. CMMI-1121146. Any opinions, findings and conclusions or recommendations expressed in this study are those of the writers and do not necessarily reflect the views of the National Science Foundation. The authors also acknowledge to the University of Puerto Rico at Mayaguez and Universidad Militar Nueva Granada.

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