Quantitative strain measurement and crack detection in RC structures using a truly distributed fiber optic sensing system

Hénault, Jean-Marie; Quiertant, Marc; Delépine-Lesoille, Sylvie; Salin, Jean; Moreau, G.; Taillade, Frédéric; Benzarti, Karim

doi:10.1016/j.conbuildmat.2012.05.029

Cited by 113 publications

(74 citation statements)

References 12 publications

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“…Previous studies conducted in the laboratory have demonstrated the efficiency of FOS systems to evaluate with accuracy the strain profile along several axis of a tested reinforced concrete specimen [16]. The technique used consisted in a FOS directly embedded into concrete.…”

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confidence: 99%

Bond behaviour of reinforcing bars in UHPFRC

et al. 2015

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This paper deals with the experimental determination of the bond behaviour between ultra-high performance fiber-reinforced concrete (UHPFRC) and reinforcing bars (rebars). An experimental campaign has been carried out to assess the bond behaviour considering different rebar diameters, different embedment lengths and different concrete covers. A relationship between bond strength, compressive strength and rebar diameter has been drawn from the results of this campaign and results found in the literature. Thanks to an original instrumentation method using Fiber-Optic Sensor, the local constitutive law linking the local relative displacement between UHPFRC and rebar and the bond stress has been determined and compared with the law proposed by fib Model Code 2010.

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confidence: 99%

Bond behaviour of reinforcing bars in UHPFRC

et al. 2015

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“…In engineering construction, the PCC pile is casted in place by vibrating and pulling out of the mould, with a maximum length of 25 m, diameter of 1.0-1.5 m, and tube thickness of 0.12-0.2 m. When OFDR technology is used, the optical fiber can be bonded to the reinforced rebar on strain measurement, through the test demonstrated by Henault [25]. This provides a new method for strain measurement and integrity evaluation of PCC pile in situ.…”

Section: Discussionmentioning

confidence: 99%

“…It has successfully been applied in different areas for strain and temperature measurement. Henault et al [25] used OBR to monitor the mechanical behavior of a representative-scale reinforced concrete structural element. It was found that the strain measured by OBR was consistent with both the experimental data obtained from conventional vibrating wire gauges and the theoretical predicted strain.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Numerical Study on Deformation Measurement of Cast-in-Place Concrete Large-Diameter Pipe Pile Using Optical Frequency Domain Reflectometer Technology

et al. 2018

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Abstract:The Cast-in-place concrete large-diameter pipe (PCC) pile has been used as the foundation reinforcement and embankment in China due to its low cost and high bearing capacity. The deformation of PCC pile under different vertical loads is very important for the application of engineering. In order to study the deformation characteristics of PCC pile, a small-scale model test was carried out. The new distributed measuring technology, named Optical Frequency Domain Reflectometer (OFDR), was applied to measure the strain on the PCC pile. A single mode fiber (SMF) was used, and the methods of layout, packaging and protection of optical fiber are introduced in detail. The obtained data was dealt with by wavelet transform, and the strain curves were analyzed based on the experiments. The finite element (FE) analysis model was established by COMSOL Multiphysics, and the numerical results compared with the experiment results. It showed that the optical fiber sensor can measure the strain of PCC pile, and that the deformation of PCC pile can be successfully obtained by OFDR technology. The strain of the pile decreases with depth and increases with loading. The measured result agrees well with numerical simulation result. The potential application of OFDR technology to PCC pile in situ and PCC energy pile is discussed.

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“…With this aim, an instrumentation of the rebar by optical fibers is used on two samples (Test 2 & Test 3). This technique, developed at IFSTTAR, has recently shown to be efficient for strain measurements on concrete structures, allowing crack detection [24] and monitoring of embedded rebars [25], with low uncertainty (10 À6 ) and high spatial resolution (1 mm). An optical fiber of diameter 250 lm is glued in an engraving along the rebar (Fig.…”

Section: Strain Field Of the Steel Rebarmentioning

confidence: 99%