Summary
The experimental studies provide valuable information for strain sensing techniques of the civil concrete structures rehabilitated with FRP by using FBG sensors. A fiber optic sensor system was applied in measurement of strains over the interfacial zones of CFRP bonded reinforced concrete specimens. Embedded FBG sensors can reveal the true strain in a structure in real time compared with externally bonded strain sensing devices, particularly for a structure which is covered by an externally bonded composite. There were no drops in the sensor strains before the peeling failure, since the sensor was long enough to cover the failed as well as undamaged section of the FRP. These findings were used as a basis for the development of relationships for modeling the debonding of the CFRP substrate from the concrete. This is a preliminary study to investigate appropriate usage of the fiber optic sensors in rehabilitated structures. Moreover, the insights gained will facilitate development of more accurate failure models for FRP strengthened structures.
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References
Udhayakumar, V., Bharathkumar, B.H., Balasubramanian, K., and Krishnamurthy, T.S., “Investigations on the Properties of Fiber Reinforced Plastic Wrap,” Proceedings of 5th Asian Symposium on Polymers in Concrete, SERC, Chennai, India; September 11–12, 577–586, (2006).
Udd, E., Fiber Optic Smart Structures, John Wiley & Sons, Inc., New York (1995).
Measures, R.M., Structural Monitoring with Fiber Optic Technology, Academic Press, California (2001).
Mufti, A.A., “FRPs and FOSs Lead to Innovation in Canadian Civil Engineering Structures,” Construction and Building Materials 17:379–387 (2003).
Lau, K.-T., “Fiber-optic sensors and smart composites for concrete applications,” Magazine of Concrete Research 55(1):19–34 (2003).
Zhao, Y., and Ansari, F., “Embedded fiber Optic Sensors for Characterization of Interface Strains in FRP Composite,” Sensors and Actuators A100:247–251 (2002).
Lau, K.-T., Yuan, L., Zhou, L.-M., Wu, J., and Woo, C.-H., “Strain Monitoring in FRP Laminates and Concrete Beams Using FBG Sensors,” Composite Structures 51:9–20 (2001).
Lau, K.-T., Zhou, L.-M., Wu, J., and Woo, C.-H., “Investigation on Strengthening and Strain Sensing Techniques for Concrete Structures Using FRP Composites and FBG Sensors,” Material and Structures 34:42–50 (2001).
Pellegrino, C., Boschetto, G., Tinazzi, D., and Modena, C., “Progress on Understanding Bond Behaviour in RC Elements Strengthened with FRP,” Proceedings of the International Symposium on Bond Behaviour of FRP in Structures, Italy, pp. 63–68 (BBFS 2005).
Hill, K.O., Fujii, Y., Johnson, D.C., and Kawasaki, B.S., “Photosensitivity in Optical Fiber Waveguides: Application to Reflection Filter Fabrication,” Applied Physics, Letter 32:647–649 (1978).
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Sundaram, B.A., Kesavan, K., Parivallal, S. et al. Technique for instrumentation and measurement of interfacial strains in FRP strengthened concrete structures using FBG sensors. Exp Tech 35, 35–38 (2011). https://doi.org/10.1111/j.1747-1567.2010.00657.x
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DOI: https://doi.org/10.1111/j.1747-1567.2010.00657.x