Cargando…
Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre
Rapid identification of structural damage positions is essential to the post-disaster rehabilitation of structures and infrastructures. Large shear deformation, e.g., shear failure of bridge piers, shear-slip of slopes, and shear cracking of structural walls, is often the cause of structural instabi...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6983129/ https://www.ncbi.nlm.nih.gov/pubmed/31905781 http://dx.doi.org/10.3390/s20010195 |
_version_ | 1783491448888360960 |
---|---|
author | Yuen, Terry Y. P. Tsai, Cheng-An Deb, Trissa Lin, Yu-Hsiang Nyienyi, June Wan, Kai Tai Huang, Qunxian |
author_facet | Yuen, Terry Y. P. Tsai, Cheng-An Deb, Trissa Lin, Yu-Hsiang Nyienyi, June Wan, Kai Tai Huang, Qunxian |
author_sort | Yuen, Terry Y. P. |
collection | PubMed |
description | Rapid identification of structural damage positions is essential to the post-disaster rehabilitation of structures and infrastructures. Large shear deformation, e.g., shear failure of bridge piers, shear-slip of slopes, and shear cracking of structural walls, is often the cause of structural instability. Distributed optical fibre sensing (DOFS) techniques have an advantage over point-based sensors in terms of spatial continuous structural condition monitoring. This paper presents the development of new measurement theory and algorithm to evaluate the structural shear deflection based on the large beam deflection and optical bend loss theories. The proposed technique adopted a photon-counting Optical Time Domain Reflectometer (ν-OTDR) with polymer optical fibres (POFs) which has a large deformation measurement range and high spatial resolution. In the experiment, shear deformation events can be successfully detected and evaluated from the proposed technique. When the normalised shear deformation is larger than 0.2, both the event locations and the magnitudes can be accurately determined. When normalised shear deformation is lesser than 0.2, the error in the magnitude evaluation increased, but the event location can be found with an absolute error <0.5 m. Multiple shear events can be treated as independent events when they are separated by more than 5 m. Various configurations of POFs attached to concrete beam specimens for rupture failure monitoring were also studied. The configuration that could maximise the POF curvature at the beam failure produced the largest ν-OTDR signals. In other configurations in which the POFs were only stretched at failure, the signals were less strong and were influenced by the POF-structure bonding strength. |
format | Online Article Text |
id | pubmed-6983129 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-69831292020-02-06 Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre Yuen, Terry Y. P. Tsai, Cheng-An Deb, Trissa Lin, Yu-Hsiang Nyienyi, June Wan, Kai Tai Huang, Qunxian Sensors (Basel) Article Rapid identification of structural damage positions is essential to the post-disaster rehabilitation of structures and infrastructures. Large shear deformation, e.g., shear failure of bridge piers, shear-slip of slopes, and shear cracking of structural walls, is often the cause of structural instability. Distributed optical fibre sensing (DOFS) techniques have an advantage over point-based sensors in terms of spatial continuous structural condition monitoring. This paper presents the development of new measurement theory and algorithm to evaluate the structural shear deflection based on the large beam deflection and optical bend loss theories. The proposed technique adopted a photon-counting Optical Time Domain Reflectometer (ν-OTDR) with polymer optical fibres (POFs) which has a large deformation measurement range and high spatial resolution. In the experiment, shear deformation events can be successfully detected and evaluated from the proposed technique. When the normalised shear deformation is larger than 0.2, both the event locations and the magnitudes can be accurately determined. When normalised shear deformation is lesser than 0.2, the error in the magnitude evaluation increased, but the event location can be found with an absolute error <0.5 m. Multiple shear events can be treated as independent events when they are separated by more than 5 m. Various configurations of POFs attached to concrete beam specimens for rupture failure monitoring were also studied. The configuration that could maximise the POF curvature at the beam failure produced the largest ν-OTDR signals. In other configurations in which the POFs were only stretched at failure, the signals were less strong and were influenced by the POF-structure bonding strength. MDPI 2019-12-29 /pmc/articles/PMC6983129/ /pubmed/31905781 http://dx.doi.org/10.3390/s20010195 Text en © 2019 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 Yuen, Terry Y. P. Tsai, Cheng-An Deb, Trissa Lin, Yu-Hsiang Nyienyi, June Wan, Kai Tai Huang, Qunxian Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title | Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title_full | Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title_fullStr | Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title_full_unstemmed | Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title_short | Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre |
title_sort | large structural shear deformation and failure monitoring using bend losses in polymer optical fibre |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6983129/ https://www.ncbi.nlm.nih.gov/pubmed/31905781 http://dx.doi.org/10.3390/s20010195 |
work_keys_str_mv | AT yuenterryyp largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT tsaichengan largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT debtrissa largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT linyuhsiang largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT nyienyijune largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT wankaitai largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre AT huangqunxian largestructuralsheardeformationandfailuremonitoringusingbendlossesinpolymeropticalfibre |