Abstract
Embedded fiber Bragg grating sensors have been extensively used worldwide for health monitoring of smart structures. In civil engineering, they provide a powerful method for monitoring the performance of composite reinforcements used for concrete structure rehabilitation and retrofitting. This paper discusses the problem of investigating the strain transfer mechanism in composite strengthened concrete beams subjected to three-point bending tests. Fiber Bragg grating sensors were embedded both in the concrete tensioned surface and in the woven fiber reinforcement. It has been shown that, if interface decoupling occurs, strain in the concrete can be up to 3.8 times higher than that developed in the reinforcement. A zero friction slipping model was developed which fitted very well the experimental data.
Highlights
The conventional concrete rehabilitation technique by means of betòn-plaques has been proven to be an effective strengthening solution in civil engineering applications but it has many disadvantages such as high weight and corrosion due to exposure to harsh environments that may eventually increase the overall maintenance cost
The use of fiber reinforced plastics (FRPs) or fiber reinforced cementitious matrices (FRCMs) for concrete beam strengthening and column confinement is an example of the results of the research efforts devoted to this important task during the last few years and represents a noteworthy improvement with respect to traditional methods
Bragggrating grating sensors were embedded both in the concrete and in the reinforcement
Summary
The conventional concrete rehabilitation technique by means of betòn-plaques has been proven to be an effective strengthening solution in civil engineering applications but it has many disadvantages such as high weight and corrosion due to exposure to harsh environments that may eventually increase the overall maintenance cost. The use of fiber reinforced plastics (FRPs) or fiber reinforced cementitious matrices (FRCMs) for concrete beam strengthening and column confinement is an example of the results of the research efforts devoted to this important task during the last few years and represents a noteworthy improvement with respect to traditional methods. In this context, deployment of embedded fiber optic sensors (FOSs) as a real-time health monitoring measurement system is very attractive, since it might provide a powerful method for substantially improving the durability and the safety of the retrofitted structure [1,2,3,4]. Fiber Bragg grating (FBG) sensors have already been successfully embedded into FRP laminated composites to monitor thermal and residual strains in the host material [8,9]
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