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Thermal strain extraction methodologies for bridge structural condition assessment

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Zhu, Yanjie, Ni, Yi-Qing, Jesus, André H., Liu, Jingliang and Laory, Irwanda (2018) Thermal strain extraction methodologies for bridge structural condition assessment. Smart Materials and Structures, 27 (10). 105051. doi:10.1088/1361-665X/aad5fb

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Official URL: http://dx.doi.org/10.1088/1361-665X/aad5fb

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Abstract

This paper presents a feature extraction method to uncover the temperature effects on bridge responses, which combines mode decomposition, data reduction and blind separation. For mode decomposition, empirical mode decomposition (EMD) and ensemble empirical mode decomposition (EEMD) have been selected, followed by principal component analysis (PCA) for data size compression. The independent component analysis (ICA) is then employed for blind separation. The unique feature of the proposed method is the blind separation, which means temperature-induced response can be extracted from the mixed structural responses, without any prior information of the loading conditions and structural physical models. This study further evaluates the effects of extracting temperature-induced response on damage detectability when using Moving Principal Component Analysis (MPCA). The numerical analysis of a truss bridge is first used to evaluate the proposed method for thermal feature extraction, followed by a real truss bridge test in the structural laboratory in University of Warwick. Results from the numerical case study show that the method enables the separation of temperature-induced response, and furthermore, the EEMD, in mode decomposition, has a positive influence on the blind separation than EMD, when combined with PCA and ICA. Finally, the real truss bridge test demonstrates that the feature extraction method can enhance the probability of MPCA to uncover the damage, as the MPCA fails without proposed method.

Item Type: Journal Article
Subjects: Q Science > QA Mathematics
T Technology > TG Bridge engineering
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Truss bridges -- Research, Principal components analysis
Journal or Publication Title: Smart Materials and Structures
Publisher: Institute of Physics Publishing Ltd
ISSN: 0964-1726
Official Date: 21 September 2018
Dates:
DateEvent
21 September 2018Published
26 July 2018Available
26 July 2018Accepted
Volume: 27
Number: 10
Article Number: 105051
DOI: 10.1088/1361-665X/aad5fb
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
217544274British Councilhttp://dx.doi.org/10.13039/501100000308
UNSPECIFIEDChina Scholarship Councilhttp://dx.doi.org/10.13039/501100004543

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