FRP debonding monitoring using OTDR techniques

Shuang Hou; C. S. Steve Cai; Jinping Ou

doi:10.1117/12.843559

20 October 2009 FRP debonding monitoring using OTDR techniques

Shuang Hou, C. S. Steve Cai, Jinping Ou

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74930I (2009) https://doi.org/10.1117/12.843559
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

Debonding failure has been reported as the dominant failure mode for FRP strengthening in flexure. This paper explores a novel debonding monitoring method for FRP strengthened structures by means of OTDR-based fiber optic technology. Interface slip as a key factor in debonding failures will be measured through sensing optic fibers, which is instrumented in the interface between FRP and concrete in the direction perpendicular to the FRP filaments. Slip in the interface will induce power losses in the optic fiber signals at the intersection point of the FRP strip and the sensing optic fiber and the signal change will be detected through OTDR device. The FRP double shear tests and three-point bending tests were conducted to verify the effectiveness of the proposed monitoring method. It is found that the early bebonding can be detected before it causes the interface failure. The sensing optic fiber shows signal changes in the slip value at about 36~156 micrometer which is beyond sensing capacity of the conventional sensors. The tests results show that the proposed method is feasible in slip measurement with high sensitivity, and would be cost effective because of the low price of sensors used, which shows its potential of large-scale applications in civil infrastructures, especially for bridges.

Citation Download Citation

Shuang Hou, C. S. Steve Cai, and Jinping Ou "FRP debonding monitoring using OTDR techniques", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930I (20 October 2009); https://doi.org/10.1117/12.843559

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