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SHM of bridges: characterising thermal response and detecting anomaly events using a temperature-based measurement interpretation approach

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Abstract

A major bottleneck preventing widespread use of Structural Health Monitoring (SHM) systems for bridges is the difficulty in making sense of the collected data. Characterising environmental effects in measured bridge behaviour, and in particular the influence of temperature variations, remains a significant challenge. This paper proposes a novel data-driven approach referred to as Temperature-Based Measurement Interpretation (TB-MI) approach to solve this challenge. The approach is composed of two key steps—(1) characterisation of thermal effects in bridges using a methodology referred to as Regression-Based Thermal Response Prediction (RBTRP) methodology, and (2) detection of anomaly events by analysing differences between measured and predicted structural behaviour. Measurements from a laboratory truss structure that is setup to simulate a range of structural scenarios are employed to evaluate the performance of the TB-MI approach. The study examines how the predictive capability of the RBTRP methodology is influenced by dimensionality reduction and measurement down-sampling, which are common pre-processing techniques used to deal with high spatial and temporal density in measurements. It also proposes a novel anomaly detection technique referred to as signal subtraction method that detects anomaly events from time-series of prediction errors, which are computed as the difference between in situ measurements and predictions obtained using the RBTRP methodology. Results demonstrate that the TB-MI approach has potential for integration within data interpretation frameworks of SHM systems of full-scale bridges.

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Acknowledgments

The authors would like to express their gratitude to Bill Harvey Associates and Pembrokshire County Council for providing access to the measurements of the Cleddau Bridge, and to Elena Barton (National Physical Laboratory) for providing the data from the National Physical Laboratory Footbridge project.

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Authors and Affiliations

  1. School of Architecture, Design and the Built Environment, Nottingham Trent University, Burton Street, Nottingham, NG1 4BU, Nottinghamshire, UK

    Rolands Kromanis

  2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Harrison Building, North Park Road, Exeter, EX4 4QF, Devon, UK

    Prakash Kripakaran

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  1. Rolands Kromanis
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  2. Prakash Kripakaran
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Correspondence to Rolands Kromanis.

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Kromanis, R., Kripakaran, P. SHM of bridges: characterising thermal response and detecting anomaly events using a temperature-based measurement interpretation approach. J Civil Struct Health Monit 6, 237–254 (2016). https://doi.org/10.1007/s13349-016-0161-z

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  • DOI: https://doi.org/10.1007/s13349-016-0161-z

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