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Sensors 2016, 16(3), 286; doi:10.3390/s16030286

Distributed Long-Gauge Optical Fiber Sensors Based Self-Sensing FRP Bar for Concrete Structure

1
School of Urban Rail Transportation, Soochow University, Suzhou 215137, China
2
International Institute for Urban System Engineering, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jose Luis Santos
Received: 5 January 2016 / Revised: 15 February 2016 / Accepted: 19 February 2016 / Published: 25 February 2016
(This article belongs to the Special Issue Optical Fiber Sensors 2016)

Abstract

Brillouin scattering-based distributed optical fiber (OF) sensing technique presents advantages for concrete structure monitoring. However, the existence of spatial resolution greatly decreases strain measurement accuracy especially around cracks. Meanwhile, the brittle feature of OF also hinders its further application. In this paper, the distributed OF sensor was firstly proposed as long-gauge sensor to improve strain measurement accuracy. Then, a new type of self-sensing fiber reinforced polymer (FRP) bar was developed by embedding the packaged long-gauge OF sensors into FRP bar, followed by experimental studies on strain sensing, temperature sensing and basic mechanical properties. The results confirmed the superior strain sensing properties, namely satisfied accuracy, repeatability and linearity, as well as excellent mechanical performance. At the same time, the temperature sensing property was not influenced by the long-gauge package, making temperature compensation easy. Furthermore, the bonding performance between self-sensing FRP bar and concrete was investigated to study its influence on the sensing. Lastly, the sensing performance was further verified with static experiments of concrete beam reinforced with the proposed self-sensing FRP bar. Therefore, the self-sensing FRP bar has potential applications for long-term structural health monitoring (SHM) as embedded sensors as well as reinforcing materials for concrete structures. View Full-Text
Keywords: self-sensing FRP bar; Brillouin scattering-based distributed optical fiber sensing technology; long-gauge sensors; macro-strain; concrete structure self-sensing FRP bar; Brillouin scattering-based distributed optical fiber sensing technology; long-gauge sensors; macro-strain; concrete structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tang, Y.; Wu, Z. Distributed Long-Gauge Optical Fiber Sensors Based Self-Sensing FRP Bar for Concrete Structure. Sensors 2016, 16, 286.

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