Concrete-filled fiber-reinforced polymer (FRP) tube is a type of newly developed structural column. It behaves brittle failure at its peak strength, and so the health monitoring on the hoop strain of the FRP tube is essential for the life cycle safety of the structure. Herein, three types of FRP tubes including 5-ply tube, 2-ply tube with local reinforcement and FRP-steel composite tube were embedded with the optic fiber Bragg grating (FBG) strain sensors in the inter-ply of FRP or the interface between FRP and steel in the middle height and the hoop direction. The compressive behaviors of the concrete-filled FRP tubes were experimentally studied. The hoop strains of the FRP tubes were recorded in real time using the embedded FBG strain sensors as well as the embedded or surface electric resistance strain gauges. Results indicated that the FBG strain sensors can faithfully record the hoop strains of the FRP tubes in compression as compared with the embedded or surface electric resistance strain gauges, and the strains recorded can reach more than με.
Concrete-filled fiber-reinforced polymer (FRP) tube is a type of newly developed structural column. It behaves brittle
failure at its peak strength, and so the health monitoring on the hoop strain of the FRP tube is essential for the life cycle
safety of the structure. Herein, the optic fiber Bragg grating (FBG) strain sensor was chosen as the strain measuring
gauge and embedded in the inter-ply of fibers in the middle height and the hoop direction of the FRP tube. The
compressive behaviors of the concrete-filled FRP tubes were experimentally studied. The hoop strain of the FRP tube
was recorded in real time using the embedded FBG strain sensor as well as the embedded or surface electric resistance
strain gauges. Results indicated that the FBG strain sensor can faithfully record the hoop strain ofthe concrete-filled FRP
tubes in compression as compared with the embedded or surface electric resistance strain gauges, and the strain recorded
can reach more than 7000με.
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