Automated structural dynamic modelling using model-free health monitoring results

  • Jeanne Tondut École Nationale d’Ingénieurs de Saint-Étienne, Saint-Étienne, France
  • J Geoffrey Chase University of Canterbury, New Zealand
  • Cong Zhou Department of Mechanical Engineering, University of Canterbury, New Zealand

Abstract

Structural health monitoring (SHM) methods provide damage metrics and localisation, but not a means of answering subsequent questions concerning immediate or long-term damage mitigation, risk, or safety in re-occupancy. Models based on the SHM results would provide a means to test these issues, but typically require extensive human input, which is not available immediately after an event to enhance and optimise immediate decision-making. This work presents a simple, readily automated modelling approach to translate SHM results from the proven hysteresis loop analysis (HLA) method into foundation models for immediate use. Experimental data from a 3-storey structure tested at the E-Defense facility in Japan are used to assess model performance. The model’s ability to capture the essential dynamics is assessed by comparing peak dynamic displacement and cross correlation coefficient (Rcoeff). For all 6 events, 3 storeys, and 2 directions, median (5-95% Range) of peak displacement error was 0.82 (0.17, 4.09) mm, and average Rcoeff = 0.82, all of which were significantly improved if the worst event was excluded. Overall, accurate nonlinear, time-varying baseline models were created using data from SHM damage identification and localisation methods using relatively quite simple model structures. The method is readily automated via algorithm, and the models were suitable for initial investigation and analysis on safety, damage mitigation, and thus re-occupancy. Such models could take SHM from being a tool for damage identification and extend it into further decision-making, creating far greater utility for engineers and owners, which could further spur impetus for investment in monitoring.

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Published
2020-12-01
How to Cite
Tondut, J., Chase, J. G., & Zhou, C. (2020). Automated structural dynamic modelling using model-free health monitoring results . Bulletin of the New Zealand Society for Earthquake Engineering, 53(4), 189-202. https://doi.org/10.5459/bnzsee.53.4.189-202
Section
Articles