期刊
STRUCTURE AND INFRASTRUCTURE ENGINEERING
卷 11, 期 2, 页码 145-161出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15732479.2013.858169
关键词
cluster analysis; symbolic data; structural health monitoring; suspended bridges; real-time assessment
资金
- FCT - Fundacao para a Ciencia e Tecnologia [SFRH/BD/44142/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/44142/2008] Funding Source: FCT
This article addresses the subject of data-driven structural health monitoring and proposes a real-time strategy to conduct structural assessment without the need to define a baseline period, in which the monitored structure is assumed healthy and unchanged. Independence from baseline references is achieved using unsupervised discrimination machine-learning methods, widely known as clustering algorithms, which are able to find groups in data relying only on their intrinsic features and without requiring prior knowledge as input. Real-time capability is based on the definition of symbolic data, which allows describing large amounts of information without loss of generality or structural-related information. The efficiency of the proposed methodology is illustrated using an experimental case study in which structural changes were imposed to a suspended bridge during an extensive rehabilitation programme. A single-value novelty index capable of describing multisensory data is proposed, and its effectiveness in identifying structural changes in real time, using outlier analysis, is discussed.
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