Damage Identification in Large-scale Bridge Girders Using Output-only Modal Flexibility-based Deflections and Span-similar Virtual Beam Models
Article
Article Title | Damage Identification in Large-scale Bridge Girders Using Output-only Modal Flexibility-based Deflections and Span-similar Virtual Beam Models |
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ERA Journal ID | 4272 |
Article Category | Article |
Authors | Le, N. T., Nguyen, A., Chan, T. H. T. and Thambiratnam, D. P. |
Journal Title | Structural Control and Health Monitoring |
Journal Citation | 2024 |
Article Number | 4087831 |
Number of Pages | 32 |
Year | 2024 |
Publisher | John Wiley & Sons |
Place of Publication | United Kingdom |
ISSN | 1122-8385 |
1365-0556 | |
1545-2255 | |
1545-2263 | |
Digital Object Identifier (DOI) | https://doi.org/10.1155/2024/4087831 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/10.1155/2024/4087831 |
Abstract | Damage identification methods using changes in static and modal flexibility-based deflections are effective tools to assess the damage in beam-like structures due to the explicit relationships between deflection change and stiffness reduction caused by damage. However, current methods developed for statically determinate beams require the calculation of mathematical scalar functions which do not exist in statically indeterminate beams and limit their application mainly to single-span bridges and cantilever structures. This paper presents an enhanced deflection-based damage identification method that can be applied to both statically determinate and indeterminate beams, including multi-span girder bridges. The proposed method utilises the deflections obtained either from static tests or proportional defections extracted from output-only vibration tests. Specifically, general mathematical relationships between deflection change and relative deflection change with respect to the damage characteristics are established. From these, additional damage-locating criteria are proposed to help distinguish undamaged spans from the damaged ones, and to identify the damage location within the damaged span. Notably, a span-similar virtual beam model concept is introduced to quantify the damage and make this task straightforward without the need to calculate complicated mathematical formulas. This model only requires information of the beam span length, which can be conveniently and accurately obtained from a real structure. The robustness of the method is tested through a series of case studies from a numerical two-span beam to a benchmark real slab-on-girder bridge as well as a complex large-scale box girder bridge. The results of these studies, including the minimal verification errors within five percent observed in the real bridge scenario, demonstrate that the proposed method is robust and can serve as a practical tool for structural health monitoring of important highway bridges. |
Keywords | Structural health monitoring; span-similar virtual beam; output-only; modal flexibility-based proportional deflection; static deflection; damage identification |
Article Publishing Charge (APC) Amount Paid | 0.0 |
Article Publishing Charge (APC) Funding | Other |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400510. Structural engineering |
400508. Infrastructure engineering and asset management | |
Byline Affiliations | School of Engineering |
Queensland University of Technology |
https://research.usq.edu.au/item/zq99w/damage-identification-in-large-scale-bridge-girders-using-output-only-modal-flexibility-based-deflections-and-span-similar-virtual-beam-models
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Structural Control and Health Monitoring - 2024 - Le - Damage Identification in Large‐Scale Bridge Girders Using.pdf | ||
License: CC BY 4.0 | ||
File access level: Anyone |
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