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Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study

When using distributed optical fiber sensors (DOFS) on reinforced concrete structures, a compromise must be achieved between the protection requirements and robustness of the sensor deployment and the accuracy of the measurements both in the uncracked and cracked stages and under loading, unloading...

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Autores principales: Barrias, António, R. Casas, Joan, Villalba, Sergi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948522/
https://www.ncbi.nlm.nih.gov/pubmed/29587449
http://dx.doi.org/10.3390/s18040980
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author Barrias, António
R. Casas, Joan
Villalba, Sergi
author_facet Barrias, António
R. Casas, Joan
Villalba, Sergi
author_sort Barrias, António
collection PubMed
description When using distributed optical fiber sensors (DOFS) on reinforced concrete structures, a compromise must be achieved between the protection requirements and robustness of the sensor deployment and the accuracy of the measurements both in the uncracked and cracked stages and under loading, unloading and reloading processes. With this in mind the authors have carried out an experiment where polyimide-coated DOFS were installed on two concrete beams, both embedded in the rebar elements and also bonded to the concrete surface. The specimens were subjected to a three-point load test where after cracking, they are unloaded and reloaded again to assess the capability of the sensor when applied to a real loading scenarios in concrete structures. Rayleigh Optical Frequency Domain Reflectometry (OFDR) was used as the most suitable technique for crack detection in reinforced concrete elements. To verify the reliability and accuracy of the DOFS measurements, additional strain gauges were also installed at three locations along the rebar. The results show the feasibility of using a thin coated polyimide DOFS directly bonded on the reinforcing bar without the need of indention or mechanization. A proposal for a Spectral Shift Quality (SSQ) threshold is also obtained and proposed for future works when using polyimide-coated DOFS bonded to rebars with cyanoacrylate adhesive.
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spelling pubmed-59485222018-05-17 Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study Barrias, António R. Casas, Joan Villalba, Sergi Sensors (Basel) Article When using distributed optical fiber sensors (DOFS) on reinforced concrete structures, a compromise must be achieved between the protection requirements and robustness of the sensor deployment and the accuracy of the measurements both in the uncracked and cracked stages and under loading, unloading and reloading processes. With this in mind the authors have carried out an experiment where polyimide-coated DOFS were installed on two concrete beams, both embedded in the rebar elements and also bonded to the concrete surface. The specimens were subjected to a three-point load test where after cracking, they are unloaded and reloaded again to assess the capability of the sensor when applied to a real loading scenarios in concrete structures. Rayleigh Optical Frequency Domain Reflectometry (OFDR) was used as the most suitable technique for crack detection in reinforced concrete elements. To verify the reliability and accuracy of the DOFS measurements, additional strain gauges were also installed at three locations along the rebar. The results show the feasibility of using a thin coated polyimide DOFS directly bonded on the reinforcing bar without the need of indention or mechanization. A proposal for a Spectral Shift Quality (SSQ) threshold is also obtained and proposed for future works when using polyimide-coated DOFS bonded to rebars with cyanoacrylate adhesive. MDPI 2018-03-26 /pmc/articles/PMC5948522/ /pubmed/29587449 http://dx.doi.org/10.3390/s18040980 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Barrias, António
R. Casas, Joan
Villalba, Sergi
Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title_full Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title_fullStr Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title_full_unstemmed Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title_short Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study
title_sort embedded distributed optical fiber sensors in reinforced concrete structures—a case study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948522/
https://www.ncbi.nlm.nih.gov/pubmed/29587449
http://dx.doi.org/10.3390/s18040980
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