Applications of FRP-OFBG sensors on bridge cables

Zhou, Zhi; Zhang, Zhichun; Deng, Nianchun; Zhao, Xuefeng; Li, Dongsheng; Wang, Chuang; Ou, Jinping

doi:10.1117/12.599823

Cited by 19 publications

(9 citation statements)

References 4 publications

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“…Most of the systems for Structural Health Monitoring are based on external sensors such as strain gauges and extensometers and a few recent smart solutions use optical fibers [2], very rarely, yet high-strength fibers themselves [3]. Most interesting solutions refer, however, to cables of bridges [4]. This is why, since 2010, the group of researchers from Silesian University of Technology (Poland) and Universidade da Beira Interior (Portugal) together with industrial partners, FIDIA (Italy), FISIPE (Portugal), and Europrojekt (Poland), decided to undertake efforts in order to create the strengthening solution, which would be able to monitor itself using the electrical features of fibers.…”

Section: Introductionmentioning

confidence: 99%

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

et al. 2016

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Externally bonded composites reinforced with high-strength fibers are increasingly popular in construction, especially in structures’ strengthening, where the best possible mechanical properties are required. At the same time the ability to autodetect threats is one of the most desirable features of contemporary structures. The authors of the paper have developed an intelligent fabric, wherein the carbon fibers play the role of not only tensile reinforcement but also strain sensor. The idea is based on the construction of the strain gauge, where the thread of carbon fibers arranged in zig-zag pattern works as electrical conductor and is insulated by parallel thread of glass or acrylic fibers. Preliminary laboratory tests were designed to create effective measurement techniques and assess the effectiveness of the strengthening of selected building structures, as reinforced concrete and timber beams. Presented in the paper, selected results of these studies are very promising, although there were some noted problems to be considered in next steps. The main problem here is the control of the cross section of the fibers tow, affecting the total resistance of the fabric. One of the main deficiencies of the proposed solution is also sensitivity to moisture.

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Section: Introductionmentioning

confidence: 99%

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

et al. 2016

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“…Extensive studies are being conducted on the utilization of the optical fiber sensor because it is immune to electromagnetic interference, is of small size, exhibits outstanding sensitivity, and can perform measurements at remote locations dozens of kilometers away. The FBG sensor is applied in various domains since it can measure various quantities and a single line can measure several locations [8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Prestressing Force in Pretensioned UHPC Deck Using a Fiber Optic FBG Sensor Embedded in a 7-Wire Strand

Kim

Kim²,

Choi

et al. 2016

Journal of Sensors

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This paper presents the results of the performance test and long-term monitoring of the prestressing force inside concrete performed on a pretensioned Ultra-High Performance Concrete (UHPC) deck. The force is measured by applying a 7-wire strand embedded with an FBG (Fiber Bragg Grating) sensor. The performance test was conducted on a 3.7 m × 1.8 m pretensioned deck specimen through wheel loading tests to verify the applicability of the measurement method. In addition, a 12.3 m long and 4.8 m wide bridge with a pretensioned UHPC deck was erected and long-term monitoring was conducted over three years to verify the applicability of the method to real bridges. The effectiveness of the measurement method of the prestressing force inside concrete is verified, and the long-term monitoring data are used to investigate various temperature compensation methods. The results show that the proposed method enables effective measurement of small changes in the prestressing force inside the concrete. These changes are caused by the external forces acting on the bridge in service and provide sufficient durability for long-term sensing. The analysis of the prestressing force obtained through long-term monitoring reveals the necessity of conducting temperature compensation for the consistency of the data acquired using the FBG sensor. Moreover, the selection of the thermal expansion coefficient appears also to be of critical importance for temperature compensation.

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“…The fiber Bragg grating (FBG) sensor [1,2] is a mainly sensing means for the smart cable [3][4][5]. Also there are some studies on the smart cable by the Brillouin sensing technique [6].…”

Section: Introductionmentioning

confidence: 99%

Long-term mechanical properties of smart cable based on FBG desensitized encapsulation sensors

Zhou²

2014

Photonic Sens

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Abstract:In order to ensure the testing range and long-term reliability of the fiber Bragg grating (FBG) used for the smart cable, a smart cable embedded with FBG strain sensors based on the desensitized encapsulation structure was designed. For a smart cable specimen, the fatigue loading experiments with the cycle from 100 thousands to 2 million and 0.95 times nominal breaking cable force (P b ) were carried out, which tested the long-serving effects of the smart cable. The test results of the static tension loading and unloading during the stepwise fatigue cycle process showed that the encapsulated FBG strain sensors had the good linearity and repeatability. Also all sensors survived after 2 million times fatigue cycle. 0.95P b static tension test showed that the encapsulated FBG strain sensors embedded inside the cable reached 4.5% testing accuracy in the 0.86P b working range. After 0.95P b static tension test, the dissection test was carried out by breaking the force tension. The results showed that the appearances of the encapsulated sensors were good, and the design structures were not changed and damaged.

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Applications of FRP-OFBG sensors on bridge cables

Cited by 19 publications

References 4 publications

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

Measurement of Prestressing Force in Pretensioned UHPC Deck Using a Fiber Optic FBG Sensor Embedded in a 7-Wire Strand

Long-term mechanical properties of smart cable based on FBG desensitized encapsulation sensors

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