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A Full Dynamic Compound Inverse Method for output-only element-level system identification and input estimation from earthquake response signals

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Abstract

This paper proposes a new output-only element-level system identification and input estimation technique, towards the simultaneous identification of modal parameters, input excitation time history and structural features at the element-level by adopting earthquake-induced structural response signals. The method, named Full Dynamic Compound Inverse Method (FDCIM), releases strong assumptions of earlier element-level techniques, by working with a two-stage iterative algorithm. Jointly, a Statistical Average technique, a modification process and a parameter projection strategy are adopted at each stage to achieve stronger convergence for the identified estimates. The proposed method works in a deterministic way and is completely developed in State-Space form. Further, it does not require continuous- to discrete-time transformations and does not depend on initialization conditions. Synthetic earthquake-induced response signals from different shear-type buildings are generated to validate the implemented procedure, also with noise-corrupted cases. The achieved results provide a necessary condition to demonstrate the effectiveness of the proposed identification method.

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Acknowledgments

The Authors would like to acknowledge public research support from “Fondi di Ricerca d’Ateneo ex 60 %” and a ministerial doctoral grant and funds at the ISA Doctoral School, University of Bergamo, Department of Engineering and Applied Sciences (Dalmine).

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  1. Dipartimento di Ingegneria e Scienze Applicate, Università di Bergamo, viale G. Marconi 5, 24044, Dalmine, BG, Italy

    Fabio Pioldi & Egidio Rizzi

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  1. Fabio Pioldi
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  2. Egidio Rizzi
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Correspondence to Egidio Rizzi.

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Pioldi, F., Rizzi, E. A Full Dynamic Compound Inverse Method for output-only element-level system identification and input estimation from earthquake response signals. Comput Mech 58, 307–327 (2016). https://doi.org/10.1007/s00466-016-1292-0

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