PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 1208–1215

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Monitoring of a prestressed bridge girder with integrated distributed fiber optic sensors Bertram Richter a *, Dennis Messerer b , Max Herbers a , Kerstin Speck a , Jakob Laukner c , Christian Gläser c , Frank Jesse d , Steffen Marx a a TUD Dresden University of Technology, Institute for Concrete Structures, 01062 Dresden, Germany b Leipzig University of Applied Sciences (HTWK Leipzig), Structural Concrete Institute, 04275 Leipzig, Germany c DYWIDAG-Systems International GmbH, 04179 Leipzig, Germany d Hentschke Bau GmbH, 02625 Bautzen, Germany Abstract Several research projects carry out experiments on a newly built 45m long research bridge, called openLAB. This contribution showcases the synergetic collaboration of the two research projects IDA-KI and smart_tendon in a joint experimental investigation on one of the openLAB’s 15m long precast and prestressed girders, which was tested in a 4-point bending test prior to its installation into the bridge. The girder was equipped with distributed fiber optic sensors (DFOS)prior to casting, as DFOS provide detailed insights into the structure’s inner with unprecedented spatial resolution. The suitability of different installation methods for structural health monitoring applications from the beginning of the structures’ existence was studied. DFOS were either embedded in the concrete matrix, glued to the longitudinal reinforcement, included in prestressing strands in direct bond or inside strands of a post tensioned tendon. Robust DFOS with a monolithic cross-section, integrated directly into the concrete matrix, enable reliable crack monitoring and anomaly detection. DFOS integrated into tendons allow for efficient construction progress without the need for additional trades. Strain profiles in the linear elastic state can be accurately mapped. A transition to the cracked state is indicated by a disproportionate strain increase. © 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 Keywords : structural health monitoring; distributed fiber optic strain sensing; smart tendon; early age monitoring; large-scale experiments; prestressed bridge girder SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Monitoring of a prestressed bridge girder with integrated distributed fiber optic sensors Bertram Richter a *, Dennis Messerer b , Max Herbers a , Kerstin Speck a , Jakob Laukner c , Christian Gläser c , Frank Jesse d , Steffen Marx a a TUD Dresden University of Technology, Institute for Concrete Structures, 01062 Dresden, Germany b Leipzig University of Applied Sciences (HTWK Leipzig), Structural Concrete Institute, 04275 Leipzig, Germany c DYWIDAG-Systems International GmbH, 04179 Leipzig, Germany d Hentschke Bau GmbH, 02625 Bautzen, Germany Abstract Several research projects carry out experiments on a newly built 45m long research bridge, called openLAB. This contribution showcases the synergetic collaboration of the two research projects IDA-KI and smart_tendon in a joint experimental investigation on one of the openLAB’s 15m long precast and prestressed girders, which was tested in a 4-point bending test prior to its installation into the bridge. The girder was equipped with distributed fiber optic sensors (DFOS)prior to casting, as DFOS provide detailed insights into the structure’s inner with unprecedented spatial resolution. The suitability of different installation methods for structural health monitoring applications from the beginning of the structures’ existence was studied. DFOS were either embedded in the concrete matrix, glued to the longitudinal reinforcement, included in prestressing strands in direct bond or inside strands of a post tensioned tendon. Robust DFOS with a monolithic cross-section, integrated directly into the concrete matrix, enable reliable crack monitoring and anomaly detection. DFOS integrated into tendons allow for efficient construction progress without the need for additional trades. Strain profiles in the linear elastic state can be accurately mapped. A transition to the cracked state is indicated by a disproportionate strain increase. © 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 Keywords : structural health monitoring; distributed fiber optic strain sensing; smart tendon; early age monitoring; large-scale experiments; prestressed bridge girder © 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; Email address: bertram.richter@tu-dresden.de * Corresponding author; Email address: bertram.richter@tu-dresden.de

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

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