PSI - Issue 64

ScienceDirect Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Procedia Structural Integrity 64 (2024) 1581–1588 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Diagnostics of Post-Tensioned Bridge Girders Using Distributed Fiber Optic Sensors Bartosz Piątek a * Tomasz Howiacki b,c , Maciej Kulpa a Tomasz Siwowski a a Rzeszow University of Technology, Powstancow Warszawy 12, 35-959 Rzeszow, Poland Abstract In contemporary bridge construction, post-tensioned concrete technology stands as one of the prevailing methods. Over the past several decades, it has been extensively employed in constructing medium-span bridges worldwide. As time has elapsed, many of these structures now demand diagnostic assessments due to deteriorating technical conditions. A promising approach for diagnosing such bridges involves utilizing distributed fiber optic sensing (DFOS) technology. DFOS enables continuous measurements to be acquired along the entire structural length, which is particularly crucial for these bridge types. Its advantages have already been demonstrated in civil engineering applications, notably in contexts related to concrete structures. The paper presents research conducted on post-tensioned beams with curvilinear multiwire prestressing strands. Optical sensors were installed before and after concreting the beams. The main aims were to measure strains, crack widths and beams’ displacements. It also compared results from DFOS-based sensors embedded in concrete during execution (for new structures) to sensors in pre-made near-surface grooves (for existing structures) and to detect defects within one beam using sensors inside the cable duct, analyzing strain data. DFOS measurements were compared with conventional spot techniques, achieving very good compliance. This investigation establishes that a well-structured DFOS-based system, encompassing suitable measurement methodologies, optical sensor configurations, installation techniques, and post-processing algorithms, emerges as a relevant tool for the comprehensive diagnostics of post tensioned concrete bridges, both the new and existing ones. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Diagnostics of Post-Tensioned Bridge Girders Using Distributed Fiber Optic Sensors Bartosz Piątek a * Tomasz Howiacki b,c , Maciej Kulpa a Tomasz Siwowski a a Rzeszow University of Technology, Powstancow Warszawy 12, 35-959 Rzeszow, Poland b Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland c SHM System, Libertow, ul Jana Pawla II 82A, 30-444 Cracow, Poland Abstract In contemporary bridge construction, post-tensioned concrete technology stands as one of the prevailing methods. Over the past several decades, it has been extensively employed in constructing medium-span bridges worldwide. As time has elapsed, many of these structures now demand diagnostic assessments due to deteriorating technical conditions. A promising approach for diagnosing such bridges involves utilizing distributed fiber optic sensing (DFOS) technology. DFOS enables continuous measurements to be acquired along the entire structural length, which is particularly crucial for these bridge types. Its advantages have already been demonstrated in civil engineering applications, notably in contexts related to concrete structures. The paper presents research conducted on post-tensioned beams with curvilinear multiwire prestressing strands. Optical sensors were installed before and after concreting the beams. The main aims were to measure strains, crack widths and beams’ displacements. It also compared results from DFOS-based sensors embedded in concrete during execution (for new structures) to sensors in pre-made near-surface grooves (for existing structures) and to detect defects within one beam using sensors inside the cable duct, analyzing strain data. DFOS measurements were compared with conventional spot techniques, achieving very good compliance. This investigation establishes that a well-structured DFOS-based system, encompassing suitable measurement methodologies, optical sensor configurations, installation techniques, and post-processing algorithms, emerges as a relevant tool for the comprehensive diagnostics of post tensioned concrete bridges, both the new and existing ones. © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers b Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland c SHM System, Libertow, ul Jana Pawla II 82A, 30-444 Cracow, Poland Keywords: Distributed fiber optic sensing; post-tensioned bridge; structural health monitoring

Keywords: Distributed fiber optic sensing; post-tensioned bridge; structural health monitoring

* Corresponding author. Tel.: +48 17 865 10 21. E-mail address: piatek@prz.edu.pl

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 10.1016/j.prostr.2024.09.412 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers * Corresponding author. Tel.: +48 17 865 10 21. E-mail address: piatek@prz.edu.pl