Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Howiacki, Tomasz; Sieńko, Rafał; Bednarski, Łukasz; Zuziak, Katarzyna

doi:10.3390/s23020566

Cited by 25 publications

(23 citation statements)

References 78 publications

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“…19,20 By integrating DFOS into the concrete, it is possible to gain valuable insights into the specimen. [21][22][23] First approaches to practical applications of crack monitoring, for example, on tunnel shells [24][25][26] or on bridges, [27][28][29][30] have already been carried out. Cracks on concrete structures can be detected by strain peaks, localized with high spatial resolution and crack widths can be determined.…”

Section: Potentials Of Fiber Optic Sensing and Aim Of This Studymentioning

confidence: 99%

“…For monitoring from zero hour, it is recommended to integrate the DFOS directly into the component. The DFOS can either be embedded in the concrete matrix 30,50,51 or attached to the reinforcement. [52][53][54] For existing structures, the DFOS must be installed subsequently, whereby a stiff bond between the component and the DFOS must be ensured for reliable strain measurement.…”

Section: Influence Of Dfos Type and Application Techniquementioning

confidence: 99%

“…31,64 While additional protective layers increase the robustness and durability of the DFOS, there is a risk that the strain peaks will be strongly attenuated due to slippage between the layers. 29,30,50…”

Section: Experimental Investigations On Crack Monitoring With Dfosmentioning

confidence: 99%

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Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

Herbers

Richter

Gebauer

et al. 2023

Structural Concrete

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The quality of strain measurements using distributed fiber optic sensors (DFOS) depends largely on the bond between the host material and the optical fiber. Experimental investigations were carried out to test the suitability of five different DFOS types for crack monitoring. The DFOS were subsequently bonded to two 4 m long reinforced concrete (RC) beams, so that the influence of the application technique could be evaluated. DFOS measurements were verified by digital image correlation (DIC) and electrical strain gauges (SGs). For the different DFOS types, clear differences in the measured strain curves and determined crack widths were observed. The focus was on two robust DFOS, which can be deployed on construction sites. Compared to the layered sensing cable, a monolithic DFOS showed a clear strain distribution with pronounced strain peaks even for closely spaced cracks. The crack widths obtained by integrating the strain curves showed high agreement with DIC measurements.

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Section: Potentials Of Fiber Optic Sensing and Aim Of This Studymentioning

confidence: 99%

Section: Influence Of Dfos Type and Application Techniquementioning

confidence: 99%

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Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

Herbers

Richter

Gebauer

et al. 2023

Structural Concrete

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“…The ES, on the other hand, has a monolithic cross section with a diameter of 3.0 mm. In a pultrusion process, the SM fiber is integrated into polyester (PE) fibers, which are impregnated with a special epoxy resin [22]. Both DFOS have a structured surface to ensure proper mechanical interlocking with the concrete.…”

Section: Strain Measurementsmentioning

confidence: 99%

Crack Monitoring on Concrete Structures using Robust Distributed Fiber Optic Sensors

Herbers,

Richter,

Marx

2023

ce papers

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The possibility to measure strains continuously using distributed fiber optic sensors (DFOS) offers enormous potential for structural health monitoring. Cracks can be automatically detected, localized and crack widths calculated. To address the relevant questions of choosing the right DFOS and appropriate application technique for monitoring existing structures, two 4 m long reinforced concrete beams were loaded under service loads in a 4‐point bending test. The DFOS were either bonded directly to the smooth concrete surface or along a groove. For comparison, another DFOS was integrated into the specimen. It is demonstrated that with the used adhesive, a good strain transfer from the specimen to the DFOS can be ensured even with subsequent installation. In order to detect all cracks with high reliability, robust DFOS with a monolithic cross section should be preferred for the practical use. The accuracy of crack width measurement was verified through Reference measurement via digital image correlation. For the monolithic DFOS, all measurement deviations were within the tolerance range of ±0.05 mm. With layered sensing cables, significant misinterpretations occurred due to strongly damped strain curves.

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“…Figure6 Strains at the measuring strip III, for the "hard" and "soft" adhesive materials in the case of Hytrel-coated fiber.…”

mentioning

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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Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Cited by 25 publications

References 78 publications

Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

Crack Monitoring on Concrete Structures using Robust Distributed Fiber Optic Sensors

On using the DFOS for damage identification in civil engineering structures

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