Embedding technology of Fiber Bragg Grating strain sensor for cable tension monitor

Shu, Yuejie; Chen, Weimin; Zhang, Peng; Wu, Jun; Liu, Lihua; Zhao, Xia

doi:10.1117/12.2038134

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…When the excitation magnetic field and temperature remain unchanged, the magnetization can be expressed as Eq. (1).…”

Section: Coupling Of Stress and Magnetizationmentioning

confidence: 99%

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Prestress Monitoring of Internal Steel Strands Using the Magnetoelastic Inductance Method

Liu¹,

Zhang²,

Zhou³

et al. 2021

PIER M

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Monitoring the prestress of prestressed steel strands is important but difficult. The magnetoelastic inductance (MI) method is used to monitor the prestress. A coupling model was established to describe the correlation among stress, magnetism, and inductance. A prestress monitoring system based on the MI effect was proposed. To verify the feasibility of the method, experiments were carried out. The results showed that influenced by the hydration heat of the grouting materials, the fluctuation range of the inductance was 1.033%. When the hydration came to an end, the inductance approached the initial inductance. For internal steel strands, the obtained inductanceprestress relationship was similar to the relationship of external steel strands. Thus, the prestress of the internal steel strands could be monitored by the MI method.

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“…When the excitation magnetic field and temperature remain unchanged, the magnetization can be expressed as Eq. (1).…”

Section: Coupling Of Stress and Magnetizationmentioning

confidence: 99%

“…During the construction and service of structures, the prestress of the internal steel strands changes. To ensure the bearing capacity and durability of structures, it is very important to obtain its prestress [1].…”

Section: Introductionmentioning

confidence: 99%

Prestress Monitoring of Internal Steel Strands Using the Magnetoelastic Inductance Method

Liu¹,

Zhang²,

Zhou³

et al. 2021

PIER M

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“…The magnetoelastic effect method has the characteristics of good dynamic response and little environmental impact. Traditional coil-based sensors [16,18] and elasto-magneto-electric sensors [17] contain an excitation unit and an induction unit [19]. The sensor is large and requires a large excitation current, thus embedding the sensor in structure is difficult and it is unsuitable for stress monitoring of internal prestressing tendons.…”

Section: Introductionmentioning

confidence: 99%

Stress Monitoring of Prestressed Steel Strand Based on Magnetoelastic Effect Under Weak Magnetic Field Considering Material Strain

Liu¹,

Zhang²,

Qu³

et al. 2020

PIER C

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Prestressed steel strands are critical components of prestressed structures, which determine the bearing capacity of the structures. The prestress loss of steel strands causes the bearing capacity to decline. To monitor the stress of prestressed steel strands, a stress monitoring method based on the magnetoelastic effect was proposed. The influence of the material strain was considered to improve monitoring accuracy. To do the monitoring, a coil-based sensor, using a small excitation current to generate a necessary magnetic field, was employed. The sensor converted the stress into inductance. An experimental system was set up, and two batches of specimens were tested. The experimental results showed that the measured inductance was stable and repeatable. There was a nonlinear relationship between the inductance and the stress. Strands of different batches need to be calibrated separately to obtain the inductance-stress equation. Based on the calibration equation and measured inductance, the stress of strands could be calculated. The difference between the calculated stress and the actual stress was small. Besides, to improve the accuracy and ease of the construction, the self-induction coil of the senor should be one layer and with moderate turns.

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“…The traditional tension monitoring method using a strain gauge can only measure the relative variation of the cable tension (not the actual tension). The strain gauge’s deformation and the structure’s deformation need to be transmitted by a coupling agent [14,15]. This generates a lag in the deformation of the strain gauge, which makes this method unsuitable for real-time measurement.…”

Section: Introductionmentioning

confidence: 99%

Cable Tension Monitoring Based on the Elasto-Magnetic Effect and the Self-Induction Phenomenon

Zhang

Zhou

et al. 2019

Materials

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Cable tension monitoring is important to control the structural performance variation of cable-supported structures. Based on the elasto-magnetic effect and the self-induction phenomenon, a new non-destructive evaluation method was proposed for cable tension monitoring. The method was called the elasto-magnetic induction (EMI) method. By analyzing the working mechanism of the EMI method, a set of cable tension monitoring systems was presented. The primary coil and the induction unit of the traditional elasto-magnetic (EM) sensor were simplified into a self-induction coil. A numerical analysis was conducted to prove the validity of the EMI method. Experimental verification of the steel cable specimens was conducted to validate the feasibility of the EMI method. To process the tension monitoring, data processing and tension calculation methods were proposed. The results of the experimental verification indicated that different cables of the same batch can be calibrated by one proper equation. The results of the numerical analysis and the experimental verification demonstrated that the cable tension can be monitored both at the tension-applying stage and the tension-loss stage. The proposed EMI method and the given monitoring system are feasible to monitor the cable tension with high sensitivity, fast response, and easy installation.

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Embedding technology of Fiber Bragg Grating strain sensor for cable tension monitor

Cited by 4 publications

References 7 publications

Prestress Monitoring of Internal Steel Strands Using the Magnetoelastic Inductance Method

Prestress Monitoring of Internal Steel Strands Using the Magnetoelastic Inductance Method

Stress Monitoring of Prestressed Steel Strand Based on Magnetoelastic Effect Under Weak Magnetic Field Considering Material Strain

Cable Tension Monitoring Based on the Elasto-Magnetic Effect and the Self-Induction Phenomenon

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