Identification of Modal Parameters of Scaled Bridge PC Beams by OMA Dynamic Tests
Publication: Journal of Bridge Engineering
Volume 29, Issue 8
Abstract
The ability of structural health monitoring (SHM) systems to detect defects and damage in existing structures is currently a key issue in the life-cycle management of civil infrastructure. In this respect, the use of dynamic identification to detect the loss of prestress load, grouting defects, cracking, and corrosion in post-tensioned concrete (PC) bridges is receiving special interest as an attractive tool that may drive predictive maintenance for disaster risk mitigation, motivating widespread implementation of SHM systems in engineering practice. In this study, an experimental program on reduced-scale PC beams representative of typical girder bridge decks, at the Department of Structures for Engineering and Architecture, University of Naples Federico II, is presented. The specimens were characterized by different prestressing load levels, grout injection conditions of post-tensioning ducts, and strand rupture during testing. Operational modal analysis (OMA) was carried out at multiple steps of each test, which were associated with different damage states of the specimens. OMA results show that both natural frequencies and mode shapes of PC girders are not significantly influenced by slight cracking corresponding to service load levels, while indicating some frequency variations in the case of local strand failure.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Project ReLUIS on the application of Guide Lines for Bridge Monitoring (Agreement between Consiglio Superiore dei Lavori Pubblici and ReLUIS) DM 240 August 23rd, 2022-WP4 Task 4.3 Prestressed bridges are gratefully acknowledged for funding the research activity.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 29 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 6, 2023
Accepted: Mar 14, 2024
Published online: May 17, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 17, 2024
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