15 February 2018 Finite element analysis-based study of fiber Bragg grating sensor for cracks detection in reinforced concrete
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Abstract
Fiber Bragg sensor is applied for detecting and monitoring the cracks that occur in the reinforced concrete. We use the three-dimensional finite element model to provide the three-axial stresses along the fiber Bragg sensor and then converted the stresses as a wavelength deformation of fiber Bragg grating (FBG) reflected spectrum. For the crack detection, an FBG sensor with 10-mm length is embedded in the reinforced concrete, and its reflection spectrum is measured after loading is applied to the concrete slab. As a result, the main peak wavelength and the ratio of the peak reflectivity to the maximal side-mode reflectivity of the optic-fiber grating represent the fracture severity. The fact that the sharp decreasing of the ratio of the peak reflectivity to the maximal side-mode reflectivity represents the early crack is confirmed by the theoretical calculation. The method can be used to detect the cracks in the reinforced concrete and give safety evaluation of large-scale infrastructure.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Lili Wang, Lili Wang, Xiangjun Xin, Xiangjun Xin, Jun Song, Jun Song, Honggang Wang, Honggang Wang, Yaozhang Sai, Yaozhang Sai, "Finite element analysis-based study of fiber Bragg grating sensor for cracks detection in reinforced concrete," Optical Engineering 57(2), 027103 (15 February 2018). https://doi.org/10.1117/1.OE.57.2.027103 . Submission: Received: 21 September 2017; Accepted: 23 January 2018
Received: 21 September 2017; Accepted: 23 January 2018; Published: 15 February 2018
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