Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space

Article


Nguyen, Khac-Duy, Chan, Tommy H. T., Thambiratnam, David P. and Nguyen, Andy. 2019. "Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space." Structural Health Monitoring: an international journal. 18 (1), pp. 49-65. https://doi.org/10.1177/1475921718809471
Article Title

Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space

ERA Journal ID3556
Article CategoryArticle
AuthorsNguyen, Khac-Duy (Author), Chan, Tommy H. T. (Author), Thambiratnam, David P. (Author) and Nguyen, Andy (Author)
Journal TitleStructural Health Monitoring: an international journal
Journal Citation18 (1), pp. 49-65
Number of Pages17
Year2019
Place of PublicationUnited Kingdom
ISSN1475-9217
1741-3168
Digital Object Identifier (DOI)https://doi.org/10.1177/1475921718809471
Abstract

Damage identification for complex structures is a challenging task due to large amount of structural elements, limited number of measured modes and uncertainties in referenced numerical models. This paper presents a study on enhancing the effectiveness of modal characteristics correlation methods for damage identification of complex structures. Firstly, a correlation method using change in ratio of modal strain energy-eigenvalue (MSEE change) is introduced. Damage information is determined via a forward approach by optimizing the correlation level between the patterns of the analytical and measured MSEE changes. Different from traditional optimization-based forward methods that require accurate numerical models, damage sensitivity coefficients of MSEE are directly estimated from experimental modal information. To enhance the damage identification capability, both elemental MSEE and total MSEE components are examined in the correlation function. Secondly, a sensitivity-weighted search space (SWSS) scheme incorporated with genetic algorithm (GA) is developed to overcome the ill-posed problem that causes false detection errors. Finally, the correlation method and the enhanced technique are experimentally tested on a complex truss model with nearly 100 elements. To deal with the huge number of degrees of freedom in this structure, a multi-layout roving test with the adoption of redundant channels is designed, and a three-criterion strategy is used for the selection of modes. Results demonstrate the effectiveness of the proposed damage assessment framework to locate and estimate damage in complex truss structures.

KeywordsDamage identification, modal strain energy, correlation-based method, genetic algorithm, search space, complex truss structure
ANZSRC Field of Research 2020400510. Structural engineering
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Byline AffiliationsQueensland University of Technology
School of Civil Engineering and Surveying
Institution of OriginUniversity of Southern Queensland
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Xiang, Ziru, Chan, Tommy H. T., Thambiratnam, David P. and Nguyen, Andy. 2017. "Prestress and excitation force identification in a prestressed concrete box–girder bridge." Computers and Concrete. 20 (5), pp. 617-625. https://doi.org/10.12989/cac.2017.20.5.617
Toward effective structural identification of medium-rise building structures
Nguyen, A., Kodikara, K. A. T. L., Chan, T. H. T. and Thambiratnam, D. P.. 2018. "Toward effective structural identification of medium-rise building structures." Journal of Civil Structural Health Monitoring. 8 (1), pp. 63-75. https://doi.org/10.1007/s13349-017-0259-y
Modelling techniques for structural evaluation for bridge assessment
Jamali, Shojaeddin, Chan, Tommy H. T., Nguyen, Andy and Thambiratnam, David P.. 2018. "Modelling techniques for structural evaluation for bridge assessment." Journal of Civil Structural Health Monitoring. 8 (2), pp. 271-283. https://doi.org/10.1007/s13349-018-0269-4
Damage detection in asymmetric buildings using vibration-based techniques
Wang, Y., Thambiratnam, D. P., Chan, T. H. T. and Nguyen, A.. 2018. "Damage detection in asymmetric buildings using vibration-based techniques." Structural Control and Health Monitoring. 25 (5), pp. 1-19. https://doi.org/10.1002/stc.2148
Response of tall buildings with symmetric setbacks under blast loading
Jayatilake, I. N., Dias, W. P. S., Jayasinghe, M. T. R. and Thambiratnam, D. P.. 2010. "Response of tall buildings with symmetric setbacks under blast loading." Journal of the National Science Foundation of Sri Lanka. 38 (2), pp. 115-123. https://doi.org/10.4038/jnsfsr.v38i2.2043