Surface Crack Detection in Prestressed Concrete Cylinder Pipes Using BOTDA Strain Sensors

Xu, Zhigang; Feng, Xin; Zhong, Sheng; Wu, Wenjing

doi:10.1155/2017/9259062

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…There were many methods for detecting or monitoring the crack. [31][32][33][34][35][36] Unfortunately, it is hard to detect the corrosioninduced crack based on these techniques, especially during the early stage. As demonstrated by the laboratory experiments, LCFS could be a suitable method for monitoring the corrosion-induced expansion strain.…”

Section: Field Testmentioning

confidence: 99%

Low-coherent fiber-optic interferometry for in situ monitoring the corrosion-induced expansion of pre-stressed concrete cylinder pipes

Wei

Liao

Zhao

et al. 2019

Structural Health Monitoring

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The corrosion-induced expansion of pre-stressed concrete cylinder pipes shapes a major determining factor in the durability of most pipeline systems. However, a structure extended in a very large span and accompanied by a slow corrosion-induced structural damage is still a challenge in practice. Here, a low-coherent fiber-optic interferometry is proposed for in situ measuring the corrosion-induced expansion by directly circling the sensing optical fiber on the outer surface of the pipe. Since the accuracy of the absolute deformation measurement by the low-coherent fiber-optic interferometry can reach 3–5 μm, we are able to improve the sensitivity by choosing the length of the sensing fiber. In the experiment, we employ 50-m sensing fiber; therefore, a resolution of about 0.1 microstrains had been approached. We chose 12 places along the pipeline as the corrosion-induced expansion monitoring points. On monitoring for about half a year, a non-uniform interface in structure, such as the repaired places, was found as a key factor of the corrosion-induced expansion development, which could be a reference for the further health care of the pipeline structures.

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Section: Field Testmentioning

confidence: 99%

Low-coherent fiber-optic interferometry for in situ monitoring the corrosion-induced expansion of pre-stressed concrete cylinder pipes

Wei

Liao

Zhao

et al. 2019

Structural Health Monitoring

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“…Strain sensors are highly significant in crack detection, as highlighted in several studies [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ], due to their ease of installation on structures and cost-effective operation. These sensors typically consist of thin films and are minimally invasive.…”

Section: Introductionmentioning

confidence: 99%

Contactless and Vibration-Based Damage Detection in Rectangular Cement Beams Using Magnetoelastic Ribbon Sensors

Tapeinos

Kamitsou

Dassios

et al. 2023

Sensors

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This study investigated the innovative use of magnetoelastic sensors to detect the formation of single cracks in cement beams under bending vibrations. The detection method involved monitoring changes in the bending mode spectrum when a crack was introduced. The sensors, functioning as strain sensors, were placed on the beams, and their signals were detected non-invasively using a nearby detection coil. The beams were simply supported, and mechanical impulse excitation was applied. The recorded spectra displayed three distinct peaks representing different bending modes. The sensitivity for crack detection was determined to be a 24% change in the sensing signal for every 1% decrease in beam volume due to the crack. Factors influencing the spectra were investigated, including pre-annealing of the sensors, which improved the detection signal. The choice of beam support material was also explored, revealing that steel yielded better results than wood. Overall, the experiments demonstrated that magnetoelastic sensors enabled the detection of small cracks and provided qualitative information about their location.

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“…Due to the large diameter and high fluid pressure, PCCP failure is always catastrophic and causes vast economic losses to countries and enterprises (Ge and Sinha, 2011). To explore the damage mechanism and avoid PCCP pipeline failure, many associated subjects have been widely studied, such as broken wires, cracks, and corrosion (Alavinasab et al, 2011;Hajali et al, 2016a;Xu et al, 2017;Zarghamee, 2001;Zarghamee et al, 2002).For all of the causes above, failure of the prestressing wires, especially a significant number of prestressing wires demonstrating breakage, is the main warning that the pipeline is operating at significantly reduced safety and remaining life (Romer et al, 2008).In the context of typical long-distance buried pipeline engineering, PCCP pipelines often suffer complicated external operating conditions, which play an important role in PCCP performance. In terms of the priority for the subject, most previous models assumed that the bedding condition was uniform (Ge and Sinha, 2014), and damage research had also focused on the pipe itself.…”

Section: Introductionmentioning

confidence: 99%

Damage evaluation of a PCCP joint with a localized soil void and broken wires

Feng

Chen

et al. 2021

Advances in Structural Engineering

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During the service life of a pipeline, the surrounding soil may erode locally around the pipe due to seepage and leakage, making the pipe partially unsupported and weakening the pipe–soil interaction. The presence of soil voids provides the possibility for broken wires and further accelerates damage. In this paper, the stress and strain of PCCP joint in service under a localized soil void and with broken wires were investigated using the general finite element software ABAQUS, and the structural damage of the pipe joint under superimposed defects was evaluated. The numerical model contained two PCCP segments, a flexible joint and the surrounding soil. The preliminary study suggests that the superimposed defects of a soil void and broken wires can cause increased damage to the PCCP joint. With the addition of the soil void, the micro cracks of both the concrete core and mortar coating transform into visible cracks, and the relative wire breakage rate with coupling defects is reduced by approximately 36% to reach the elastic limit state of the pipe. The findings of this research highlight the importance of good pipe–soil interactions and could provide a theoretical reference for damage assessment and further repair strategies.

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Surface Crack Detection in Prestressed Concrete Cylinder Pipes Using BOTDA Strain Sensors

Cited by 12 publications

References 12 publications

Low-coherent fiber-optic interferometry for in situ monitoring the corrosion-induced expansion of pre-stressed concrete cylinder pipes

Low-coherent fiber-optic interferometry for in situ monitoring the corrosion-induced expansion of pre-stressed concrete cylinder pipes

Contactless and Vibration-Based Damage Detection in Rectangular Cement Beams Using Magnetoelastic Ribbon Sensors

Damage evaluation of a PCCP joint with a localized soil void and broken wires

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