Faseroptische Sensoren zur kontinuierlichen Dehnungsmessung im Beton

Speck, Kerstin; Vogdt, Fritz; Curbach, Manfred; Petryna, Yuri

doi:10.1002/best.201800105

Cited by 21 publications

(26 citation statements)

References 8 publications

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“…They found that the fiber could not sufficiently anchor in the concrete structure. Using a brass frame, researchers fixed a fiber around Speck in small-format concrete specimens and achieved similar values to the reference measurement [27]. Fischer et al compared fiber cables and two different coating materials for crack detection in the matrix [10].…”

Section: Introductionmentioning

confidence: 89%

“…The strain transfer properties of three different coating materials were investigated by using shrinkage tests. With two conventional coatings acrylate and polyimide, the results from the literature should be verified and form a baseline for comparison [10,16,22,27]. The third coating material Ormocer R was developed especially for FBG sensors and showed good strain transfer properties in previous investigations with bonded sensors [9,31].…”

Section: Experimental Program 21 Coating Materials and Concrete Mixturementioning

confidence: 99%

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Comparison among Different Fiber Coatings on the Concrete Shrinkage Test for Distributed Optical Strain Measurements based on Rayleigh Backscattering

Weisbrich¹,

Holschemacher²,

Bier³

2019

Preprint

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The fiber optic strain measurement based on Rayleigh scattering has recently become increasingly popular in automotive or mechanical engineering for strain monitoring and in the construction industry in general, especially structural health monitoring. This technology enables the monitoring of strain along the entire fiber length. Several publications have been published, particularly on the applications to the structural component. This article addresses integrating optical fibers of different coatings into the concrete matrix to measure the shrinkage deformations. In this context, three different coating types were investigated regarding their strain transfer. The fibers were integrated into fine-grained concrete prisms, and the shrinkage strain was compared with a precise dial gauge. The analysis shows a high correlation between the reference method and the fiber measurement, especially with the Ormocer coating. The used acrylate coating is also consistent in the middle area of the specimen but requires a certain strain introduction length to indicate the actual strain. The main result of this study is a recommendation for fiber coatings for shrinkage measurement in fine grain concretes using the distributed fiber optic strain measurement. In addition, the advantages and disadvantages of the measurement method are presented.

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Section: Introductionmentioning

confidence: 89%

Section: Experimental Program 21 Coating Materials and Concrete Mixturementioning

confidence: 99%

Comparison among Different Fiber Coatings on the Concrete Shrinkage Test for Distributed Optical Strain Measurements based on Rayleigh Backscattering

Weisbrich¹,

Holschemacher²,

Bier³

2019

Preprint

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show abstract

“…Wenn die Faser einer mechanischen Belastung oder Temperaturstörungen ausgesetzt wird, wird das Rayleigh‐Streuungsprofil erneut gemessen und anschließend werden beide Datensätze in kleine Segmente unterteilt, die in den Frequenzbereich fouriertransformiert werden. Durch eine Kreuzkorrelationsoperation zwischen dem Referenz‐ und dem verformten Zustand kann eine spektrale Verschiebung im Korrelationspeak gefunden werden, die dann auf Dehnungs‐ oder Temperaturänderungen kalibriert werden kann [17, 18].…”

Section: Quasikontinuierliche Dehnungsmessung Mit Faseroptischen Sensunclassified

“…Die Variation der Sensoreigenschaften erfolgt überwiegend über die Ummantelung der Glasfasern. Basierend auf dem Coating (Bild 1) variieren die für verlustfreie Weiterleitung des Lichts möglichen Umlenkradien und auch die Steifigkeiten der Fasern [18, 27, 30]. Im Stahlbetonbau eignen sich diese „blanken“ Fasern vor allem für die Applikation auf erhärteten Probekörperoberflächen [31–36] oder entlang von Bewehrungsstäben bzw.…”

Section: Quasikontinuierliche Dehnungsmessung Mit Faseroptischen Sensunclassified

Dehnungsmessung bei mehraxialen Druckversuchen an Beton mittels faseroptischer Sensoren

Speck

Vogdt

Curbach

et al. 2021

Beton und Stahlbetonbau

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Für die Quantifizierung lastinduzierter anisotroper Schädigungen unter verschiedenen mehraxialen Spannungszuständen ist die Dehnungsmessung im Inneren kleinformatiger Probekörper erforderlich. Quasikontinuierlich messende faseroptische Sensoren ohne werksseitige Schutzummantelung können dafür neue Möglichkeiten eröffnen. Dieser Beitrag erläutert die Herausforderungen bei der Dehnungsmessung bei mehraxialen Versuchen und das Potenzial der quasikontinuierlichen Dehnungsmessung mit faseroptischen Sensoren. Es wird die Positionierung der Messfasern mittels eines Messingprofils in den unbewehrten Probekörpern erläutert und die Beeinflussung der Betoneigenschaften durch dieses Trägergestell. Die möglichen Messgenauigkeiten und messtechnischen Besonderheiten speziell hinsichtlich der querdruckempfindlichen und nicht alkaliresistenten Messfasern werden aufgezeigt. Ein Vergleich mit der häufig angewandten Dehnungsmessung über die Bürstenverformung zeigt, dass trotz aller bestehenden Herausforderungen die faseroptischen Sensoren eine Dehnungsmessung bei dreiaxialen Versuchen in bisher nicht erreichbarer Genauigkeit ermöglichen.

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“…A measurement by singular sensors would have missed this phenomenon even using as many sensors as geometrically possible. The continuous measurement along the fibre is especially useful to detect singularities such as cracks within a concrete beam [17,18]. In Chen et al [19] a carbon fibre reinforced polymer (CFRP) strip was used to strengthen a concrete beam, FOS were applied to the steel rebar inside the concrete and on the CFRP surface, adhesively bonded to the concrete beam.…”

Section: Strain Measurement Using Optical Fibresmentioning

confidence: 99%

Deformation measurement within adhesive bonds of aluminium and CFRP using advanced fibre optic sensors

et al. 2020

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Monitoring the deformation within an adhesive joint during the curing cycle provides valuable information regarding the build-up of thermal strain and stress. Distributed fibre optic sensors are very useful for spatial continuous measurements of deformation or temperature. Integrated into a hybrid joint, the thermal curing process of the adhesive can be monitored. This detailed insight into the joint helps to understand the deformation and thereby also the resulting stress. Analysing the deformation process establishes the foundation to adapt techniques to reduce the thermally induced deformation and thereby the resulting stress.

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Faseroptische Sensoren zur kontinuierlichen Dehnungsmessung im Beton

Cited by 21 publications

References 8 publications

Comparison among Different Fiber Coatings on the Concrete Shrinkage Test for Distributed Optical Strain Measurements based on Rayleigh Backscattering

Comparison among Different Fiber Coatings on the Concrete Shrinkage Test for Distributed Optical Strain Measurements based on Rayleigh Backscattering

Dehnungsmessung bei mehraxialen Druckversuchen an Beton mittels faseroptischer Sensoren

Deformation measurement within adhesive bonds of aluminium and CFRP using advanced fibre optic sensors

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