An Optical Fiber Bragg Grating Sensing System for Scour Monitoring
This paper proposes an optical fiber Bragg grating (FBG) sensing system for scour monitoring around the foundations of bridge piers and abutments. The new system introduces a uniform-strength fiber-reinforced polymer (FRP) beam that is instrumented with two FBG sensors in two sides of its neutral axis. The tensile and compressive strains of the beam are measured under a hydrodynamic pressure as water flowing around bridge foundations. By assuming equal temperatures around the uniform-strength beam, the difference in wavelength variations of the two embedded FBG sensors was found to be proportional to the square of flow velocity, which is directly related to scour. A prototype scour sensing system was designed and fabricated to test its sensing property in the laboratory. The experimental results indicate that the proposed system is sensitive to flow change and further monitor the scour process effectively, without responding to its surrounding hydrostatic and soil pressures.
Z. Zhou et al., "An Optical Fiber Bragg Grating Sensing System for Scour Monitoring," Advances in Structural Engineering, vol. 14, no. 1, pp. 67-78, Multi-Science Publishing Co. Ltd, Feb 2011.
The definitive version is available at http://dx.doi.org/10.1260/1369-43126.96.36.199
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Fiber-Reinforced Polymer; Optical Fiber Bragg Grating Sensor; Scour Monitoring; Sensing Property; Uniform-Strength Beam; Bridge Foundation; Compressive Strain; Embedded FBG; FBG Sensor; Flow Changes; Hydrodynamic Pressure; Neutral Axis; New System; Scour Process; Sensing Systems; Soil Pressure; Electric Sensing Devices; Fiber Bragg Gratings; Fiber Optic Components; Fiber Optic Sensors; Fiber Reinforced Plastics; Soil Testing
International Standard Serial Number (ISSN)
Article - Journal
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