Abstract
Optical fiber Bragg grating (FBG) has been recognized as an outstanding high-performance local monitoring sensor and is largely applied in structural health monitoring (SHM). This paper proposes a series of fiber-reinforced polymer- (FRP-) packaged optical fiber Bragg grating strain sensors to completely meet the requirements of rough civil engineering infrastructures, and their sensing performance under normal environment and harsh environment is experimentally investigated. It is experimentally and theoretically proved that FRP-packaged FBG strain sensors maintain excellent sensing performance as the bare FBG sensor under a harsh environment, and their durability is significantly enhanced due to the FRP materials. These FRP-packaged FBG strain sensors are successfully applied in the SHM system of Aizhai Bridge.
Highlights
Infrastructures, such as long-span bridges, high-rise buildings, large dams, nuclear power stations, and offshore platforms, will inevitably suffer damage accumulation and resistance degradation subjected to coupling actions of environmental corrosion, material aging, long-term loading, fatigue, and natural disaster hazards, even collapse, during their long time of service [1]
Calculations proved that the interfacial strain transferring error rate of carbon fiber-reinforced polymer (CFRP)-OFBG bars for the shear modulus being greater than 12 GPa and the outer diameter being Φ4∼ Φ10 mm is 1.92∼2.16%, and the corresponding error correction factor k is 1.02∼1.022
From the results provided we can conclude that the test accuracy of fiber-reinforced polymer- (FRP-)packaged optical fiber strain sensors is sufficient for civil engineering structures with significant material discrete characteristic and can be applied in the practical structures directly without any error correction
Summary
Infrastructures, such as long-span bridges, high-rise buildings, large dams, nuclear power stations, and offshore platforms, will inevitably suffer damage accumulation and resistance degradation subjected to coupling actions of environmental corrosion, material aging, long-term loading, fatigue, and natural disaster hazards, even collapse, during their long time of service [1]. The key problem of this development focuses on the selection of packaging materials for sensors form of different layout process and performance requirements, in order to ensure the that packaged FBG sensor possesses excellent durability, linearity, repeatability, and measurement range for long-term monitoring of civil engineering. Because of the plastic properties under large strain conditions and corrosion of metallic materials, as well as the creep and aging characteristics of the adhesive interlayer, sensors developed by this encapsulation technique are deficient in durability, linearity, and repeatability, in addition to the small measurement scale (less than 2000 με). The practical application of these FRP-packaged FBG strain sensors in Aizhai Bridge SHM system is briefly introduced
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