Abstract
Recently, it has become necessary to develop a monitoring technology that combines an FBG (fiber Bragg grating) sensor as a means for continuously monitoring whether the reinforcing effect of an FRP (fiber-reinforced polymer) is maintained on FRP-reinforced structural members. However, most existing research focuses on the insertion of FBG sensors into bar-shaped FRPs, and there is a lack of studies that analyze the details for an FRP strip combined with FBG sensors. In this regard, this paper seeks to develop a reinforcement for an NSM (near-surface-mounted) retrofit in which an optical fiber with an FBG sensor is combined with FRP strips. For this, a series of experiments were performed to find the adhesive strength of optical fiber-epoxy-FRP interfaces, the tensile strength of the FBG sensor part of optical fiber with a reflection lattice, and the sensing performance depending on the adhesion length between the optical fiber and the FRP strips. As a result of the study, the adhesion length not less than 20 mm in one direction from the center, with a total adhesion length of 40 mm, needs to be secured when the optical fiber with an FBG is attached and fixed between the two FRP strips with epoxy. In addition, it is expected that the proposed model can be used to properly predict the strain transfer of an FRP strip with a fiber optic sensor and can also be utilized when determining optimum dimensions.
Highlights
Buildings undergo changes in structural functions due to the passage of time and environmental factors
A series of experiments were conducted to identify the tensile strength of the optical fiber in which an FBG is formed and examine the adhesive strength when attaching the optical fiber to the fiber-reinforced polymer (FRP) with epoxy
An analysis model was applied to evaluate the sensing capacity according to the adhesion length when the FBG sensor was coupled to the FRP with epoxy and was evaluated experimentally
Summary
Buildings undergo changes in structural functions due to the passage of time and environmental factors. While the electrical resistance measurement method cannot perform multiple measurements on one line, the measuring technology using an optical fiber enables. Bragg grating (FBG)-based fiber optic sensing has target structural member [5,6,7]. A technology that combines the FBG sensor with the sheet bar typeofof reinforcement reinforcementmaterials materialshas hasbeen beendeveloped developedtotocontinuously continuouslymonitor monitorthe thereinforcing reinforcingeffect effectofofthe used in strengthening reinforced concrete members [18,19,20]. FRP in the form of bars or plates is mainly used, and the process of forming grooves on the issurface added isinadded this method, it ensures excellent reinforcing effects. Retrofit.InInparticular, particular,ititsought soughttotoinvestigate investigatethe thecombining combiningmethod method ofofthe and To this end, a series of experiments were conducted to identify the tensile the FRP and FBG sensor.
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