Crack Detection Application for Fiber Reinforced Concrete Using BOCDA-Based Optical Fiber Strain Sensor

Imai, Michio; Nakano, Ryouji; Kono, Tetsutya; Ichinomiya, Toshimichi; Miura, Satoru; Mure, Masahito

doi:10.1061/(asce)st.1943-541x.0000195

Cited by 55 publications

(37 citation statements)

References 5 publications

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“…The system returns an average value of strain or temperature or both with selected spatial resolution. A spatial resolution of 1 m [7,16] is sufficient for the most civil engineering purposes when tracking global changes. These new techniques provide for reliable distributed measurements for strain and temperature and also crack detection over long distances.…”

Section: Previous Research On Distributed Sensing and Crack Monitorinmentioning

confidence: 99%

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Evaluation of a large-scale bridge strain, temperature and crack monitoring with distributed fibre optic sensors

Enckell

Glišić

Myrvoll

et al. 2011

J Civil Struct Health Monit

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Many structures like bridges are ageing and the necessity to measure the uncertain parameters is relevant. Crack-related parameters can be measured with traditional techniques like crack gauges and displacement transducers. A method that can detect and localise cracks as well as measure crack width is most favourable. Several distributed and quasi-distributed systems were introduced to the market and tested in recent years. This paper presents a large-scale Structural Health Monitoring project based on stimulated Brillouin scattering in optical fibres for an old bridge. The Götaälv Bridge is a continuous steel girder bridge with concrete bridge deck. Steel girders suffer from fatigue and mediocre steel quality and some severe cracking and also a minor structural element collapse have taken place. The system installed on the bridge measures strain profiles along the whole length of the bridge and detects cracks that are wider than 0.5 mm. Procedures like factory acceptance test, site acceptance test, laboratory testing and field testing are presented and analysed. Innovative technology was developed, tested and applied on the bridge. Heuristic knowledge was collected; conclusions are presented and discussed for future development.

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Section: Previous Research On Distributed Sensing and Crack Monitorinmentioning

confidence: 99%

“…Crack detection and crack width estimation and/or measurement by distributed technology are tested and discussed by [7,20]. Bao et al [1] tested non-linear strain response of the concrete columns to detect the de-bonding and cracks under loading and rotation conditions.…”

Section: Previous Research On Distributed Sensing and Crack Monitorinmentioning

confidence: 99%

Evaluation of a large-scale bridge strain, temperature and crack monitoring with distributed fibre optic sensors

Enckell

Glišić

Myrvoll

et al. 2011

J Civil Struct Health Monit

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“…This limitation can be overcome either by the use of a sophisticated signal processing of data, permitting to detect more accurately the crack-induced strains, [5], or by the use of an SBS sensor with improved spatial resolution. A cm scale spatial resolution has the clear advantage of permitting a precise localization of the crack within the monitored structure [6]. Work is in progress in order to push the spatial resolution of the portable instrument in the cm-range.…”

Section: ±1mentioning

confidence: 99%

Distributed Strain Measurement along a Concrete Beam via Stimulated Brillouin Scattering in Optical Fibers

Bernini

Minardo

Ciaramella³

et al. 2011

International Journal of Geophysics

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The structural strain measurement of tension and compression in a 4 m long concrete beam was demonstrated with a distributed fiber-optic sensor portable system based on Brillouin scattering. Strain measurements provided by the fiber-optic sensor permitted to detect the formation of a crack in the beam resulting from the external applied load. The sensor system is valuable for structural monitoring applications, enabling the long-term performance and health of structures to be efficiently monitored.

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“…All these methods had been proved in laboratory with acceptable results, but they can still be improved. Some recent research prototypes in BOCDA technique exhibit better spatial resolution close to 3 m (Imai et al 2010, Imai and Susuki 2011, Imai and Feng 2012. Different techniques have been developed to obtain continuous data easily.…”

Section: Crack Detection In Concrete Elementsmentioning

confidence: 99%

“…To enhance the capability of detecting the weak backscattering signal and increase the spatial resolution, several improving techniques have been used (Thévanaz 2010, Bao andChen 2012) and new sensing systems have recently been developed which allows spatial resolution in cm-range. Brillouin Optical Correlation Domain Analysis (BOCDA) (Hotate et al 2002, Imai et al 2010) is an example of these new technical developments. Nowadays, DOFSs based on Brillouin backscattering are used in laboratory tests or in SHM systems applied in civil structures as bridges, buildings, pipelines and railways (Ohno et al 2001).…”

Section: Brillouin Optical Time Domain Analysis (Botda)mentioning

confidence: 99%

SHM by DOFS in civil engineering: a review

Rodríguez¹,

Casas²,

Villalba³

2015

Structural Monitoring and Maintenance

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Abstract. This paper provides an overview of the use of different Distributed Optical Fiber Sensor systems (DOFSs) to perform Structural Health Monitoring (SHM) in the specific case of civil engineering structures. Nowadays, there are several methods available for extracting distributed measurements from optical fiber, and their use have to be according with the aims of the SHM performance. The continuous-in-space data is the common advantage of the different DOFSs over other conventional health monitoring systems and, depending on the particular characteristics of each DOFS, a global and/or local health structural evaluation is possible with different accuracy. Firstly, the fundamentals of different DOFSs and their principal advantages and disadvantages are presented. Then, laboratory and field tests using different DOFSs systems to measure strain in structural elements and civil structures are presented and discussed. Finally, based on the current applications, conclusions and future trends of DOFSs in SHM in civil structures are proposed.

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Crack Detection Application for Fiber Reinforced Concrete Using BOCDA-Based Optical Fiber Strain Sensor

Cited by 55 publications

References 5 publications

Evaluation of a large-scale bridge strain, temperature and crack monitoring with distributed fibre optic sensors

Evaluation of a large-scale bridge strain, temperature and crack monitoring with distributed fibre optic sensors

Distributed Strain Measurement along a Concrete Beam via Stimulated Brillouin Scattering in Optical Fibers

SHM by DOFS in civil engineering: a review

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