Validierung verteilter faseroptischer Sensorik zur Dehnungsmessung im Betonbau

Weisbrich, Martin; Holschemacher, Klaus; Bier, Thomas

doi:10.1002/best.202100057

Cited by 8 publications

(23 citation statements)

References 23 publications

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“…Although not explicitly studied in this paper, previous unpublished studies of the authors comparing different adhesives have shown its suitability. For further studies on the matter, the reader is referred to [33,34]. Much research has been carried out to investigate the suitability of various coating types, e.g., [19,23,25].…”

Section: Selection Of Sensing Fibres For Reinforced Concrete Instrume...mentioning

confidence: 99%

Application of Distributed Fibre Optical Sensing in Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading

Lemcherreq

Galkovski

Mata‐Falcón

et al. 2022

Sensors

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Distributed fibre optical sensing (DFOS) is increasingly used in civil engineering research. For reinforced concrete structures, almost continuous information concerning the deformations of embedded reinforcing bars can be obtained. This information enables the validation of basic and conventional assumptions in the design and modelling of reinforced concrete, particularly regarding the interaction of concrete and reinforcing bars. However, this relatively new technology conceals some difficulties, which may lead to erroneous interpretations. This paper (i) discusses the selection of sensing fibres for reinforced concrete instrumentation, accounting for strain gradients and local anomalies caused by stress concentrations due to the reinforcing bar ribs; (ii) describes suitable methods for sensor installation, strain acquisition and post-processing of the data, as well as determining and validating structurally relevant entities; and (iii) presents the results obtained by applying DFOS with these methods in a variety of experiments. The analysed experiments comprise a reinforced concrete tie, a pull-out test under cyclic load, and a flexural member in which the following mechanical relevant quantities are assessed: the initial strain state in reinforcing bars, normal and bond shear stresses, deflections as well as forces. These applications confirm the benefit of DFOS to better understand the bond behaviour, but also demonstrate that its application is intricate and the results may lead to erroneous conclusions unless evaluated meticulously.

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Section: Selection Of Sensing Fibres For Reinforced Concrete Instrume...mentioning

confidence: 99%

Application of Distributed Fibre Optical Sensing in Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading

Lemcherreq

Galkovski

Mata‐Falcón

et al. 2022

Sensors

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“…Strains are measured in the core of the optical fiber only and transferred by means of bond from the surrounding material into the DFOS's core, exhibiting strain lag. 25,26 Hence, the (theoretically infinite) strain peak in a crack's location is smeared to both sides of the DFOS. The bond's stiffness is constituted by the materials' parameters, thicknesses and interface interactions of all layers inbetween the surrounding material and the DFOS's core.…”

Section: Transfer Length Of a Crackmentioning

confidence: 99%

“…Strains are measured in the core of the optical fiber only and transferred by means of bond from the surrounding material into the DFOS's core, exhibiting strain lag 25,26 . Hence, the (theoretically infinite) strain peak in a crack's location is smeared to both sides of the DFOS.…”

Section: Automated Data Assessment and Evaluation Workflow Using Dfosmentioning

confidence: 99%

“…Hence, the (theoretically infinite) strain peak in a crack's location is smeared to both sides of the DFOS. The bond's stiffness is constituted by the materials' parameters, thicknesses and interface interactions of all layers in‐between the surrounding material and the DFOS's core 10,25,26 . Stiffer bond results in less strain lag, shorter transfer length and higher strain peaks.…”

Section: Automated Data Assessment and Evaluation Workflow Using Dfosmentioning

confidence: 99%

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Crack monitoring on concrete structures with distributed fiber optic sensors—Toward automated data evaluation and assessment

Richter,

Herbers,

Marx

2023

Structural Concrete

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The ability to measure strains quasi‐continuously with high spatial resolution makes distributed fiber optic sensing a promising technology for structural health monitoring as it allows to locate and measure damages in concrete structures, such as cracks. Depending on whether the distributed fiber optic sensor (DFOS) is embedded into the concrete matrix or bonded to the reinforcement, different approaches for crack width calculation exist. The high spatial resolution of DFOS quickly leads to a large amount of data, especially with time continuous monitoring. Scalable, automated analysis approaches are required to handle such big data and to derive a gain in knowledge from the measurements. Thus, in a first step, the Python framework fosanalysis is presented and made available to other researchers or monitoring specialists as free software. The most important input parameters for crack width calculation are discussed for concrete strain and steel strain DFOS. Accurate crack monitoring for a 4 m long reinforced concrete beam is demonstrated by using fosanalysis. The calculated crack widths are in good agreement with digital image correlation measurements.

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“…The influence of various parameters on laboratory scale elements has been studied by many researchers. It has been shown that cyanoacrylate adhesive is suitable for localized bonding of fiber optic cables to the surface of concrete structures due to its low strain loss [3]. However, the concrete surface must be well prepared before the fiber sensors are applied.…”

Section: Introductionmentioning

confidence: 99%

On using the DFOS for damage identification in civil engineering structures

Alkam,

Ganß,

Lieboldt

et al. 2023

ce papers

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The application of distributed fiber optic sensing (DFOS) technologies to the monitoring of civil engineering structures has been widely developed in recent years. In particular, fiber optic sensing (FOS) using the Rayleigh backscattering phenomenon of the laser frequency spectrum has been used to continuously measure strain along the fiber optic sensor with high spatial resolution. However, the practical implementation of fiber optic sensorsin the field is still a challenge. These include, but are not limited to, the bonding between fiber sensor cables and the surrounding medium, the practical way in which fiber optic sensors can be installed in concrete structures, and the analysis of crack width using the strain distribution along the fiber. Compared to classical discrete sensors, the DFOS has a great potential to detect, localize and quantify crack formation even in the early stages of microcracking. This paper discusses the potential and challenges of using distributed fiber optic sensors for crack detection in concrete structures. In this sense, different types of mechanical tests on concrete structures using different fiber optic sensors, and different bonding techniques are presented to explore the possibilities of crack detection in concrete structures and its potential for practical structural health monitoring (SHM) systems of civil structures.

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Validierung verteilter faseroptischer Sensorik zur Dehnungsmessung im Betonbau

Cited by 8 publications

References 23 publications

Application of Distributed Fibre Optical Sensing in Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading

Application of Distributed Fibre Optical Sensing in Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading

Crack monitoring on concrete structures with distributed fiber optic sensors—Toward automated data evaluation and assessment

On using the DFOS for damage identification in civil engineering structures

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