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Structural Engineering and Mechanics Volume 81, Number 5, March10 2022 , pages 647-664 DOI: https://doi.org/10.12989/sem.2022.81.5.647 |
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Structural novelty detection based on sparse autoencoders and control charts |
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Rafaelle P. Finotti, Carmelo Gentile, Flavio Barbosa and Alexandre Cury
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| Abstract | ||
| The powerful data mapping capability of computational deep learning methods has been recently explored in academic works to develop strategies for structural health monitoring through appropriate characterization of dynamic responses. In many cases, these studies concern laboratory prototypes and finite element models to validate the proposed methodologies. Therefore, the present work aims to investigate the capability of a deep learning algorithm called Sparse Autoencoder (SAE) specifically focused on detecting structural alterations in real-case studies. The idea is to characterize the dynamic responses via SAE models and, subsequently, to detect the onset of abnormal behavior through the Shewhart T control chart, calculated with SAE extracted features. The anomaly detection approach is exemplified using data from the Z24 bridge, a classical benchmark, and data from the continuous monitoring of the San Vittore bell-tower, Italy. In both cases, the influence of temperature is also evaluated. The proposed approach achieved good performance, detecting structural changes even under temperature variations. | ||
| Key Words | ||
| damage detection; deep learning; machine learning; sparse autoencoder; structural health monitoring | ||
| Address | ||
| Rafaelle P. Finotti: Graduate Program in Computational Modeling, Federal University of Juiz de Fora, Brazil Carmelo Gentile: Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Italy Flavio Barbosa: Graduate Program in Computational Modeling, Federal University of Juiz de Fora, Brazil; Graduate Program in Civil Engineering, Federal University of Juiz de Fora, Brazil Alexandre Cury: Graduate Program in Civil Engineering, Federal University of Juiz de Fora, Brazil | ||