Structural Monitoring and Maintenance

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Carbon fiber-based long-gauge sensors monitoring the flexural performance of FRP-reinforced concrete beams

  • Mohamed A. Saifeldeen (Department of Civil Engineering, Faculty of Engineering, Aswan University) ;
  • Nariman Fouad (Department of Civil Engineering, Faculty of Engineering, Aswan University)
  • Received : 2023.11.18
  • Accepted : 2023.12.20
  • Published : 2023.12.25
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Abstract

Long-gauge carbon fiber line (CFL) sensors have received considerable attention in the past decade. However, there is still a need for an in-depth investigation of their measuring accuracy. This study investigates the accuracy of carbon fiber line sensors to monitor and differentiate the flexural behavior of two beams, one reinforced with steel bars alone and the other reinforced with steel and basalt fiber-reinforced polymer bars. A distributed set of long-gauge carbon fiber line, Fiber Bragg Grating (FBG), and traditional strain gauge sensors was mounted on the tensile concrete surface of the studied beams to compare the results and assess the accuracies of the proposed sensors. The test beams were loaded monotonically under four-point bending loading until failure. Results indicated the importance of using long-gauge sensors in providing useful, accurate, and reliable information regarding global structural behavior, while point sensors are affected by local damage and strain concentrations. Furthermore, long-gauge carbon fiber line sensors demonstrated good agreement with the corresponding Fiber Bragg Grating sensors with acceptable accuracy, thereby exhibiting potential for application in monitoring the health of large-scale structures.

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References

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