Techno Press


Structural Engineering and Mechanics   Volume 17, Number 3, March 2004, pages 347-356
DOI: http://dx.doi.org/10.12989/sem.2004.17.3_4.347
 
Fiber optic smart monitoring of concrete beam retrofitted by composite patches
Ki-Soo Kim, Chul Chung, Ho-Joon Lee, Sechul-Ri , Young-Goo Kang and Hong Kim

 
Abstract     [Full Text]
    In order to extend the lifetime of buildings and civil infrastructure, patch type fibrous composite retrofitting materials are widely used. Retrofitted concrete columns and beams gain stiffness and strength, but lose toughness and show brittle failure. Usually, the cracks in concrete structures are visible to the naked eye and the status of the structure in the life cycle is estimated through visual inspections. After retrofitting of the structure, crack visibility is blocked by retrofitted composite materials. Therefore, structural monitoring after retrofitting is indispensable and self diagnosis method with optical fiber sensors is very useful. In this paper, we try to detect the peel out effect and find the strain difference between the main structure and retrofitting patch material when they separate from each other. In the experiment, two fiber optic Bragg grating sensors are applied to the main concrete structure and the patching material separately at the same position. The sensors show coincident behaviors at the initial loading, but different behaviors after a certain load. The test results show the possibility of optical fiber sensor monitoring of beam structures retrofitted by the composite patches.
 
Key Words
    fiber optic sensors; carbon sheet; repair; self diagnosis; delamination and self monitoring.
 
Address
Ki-Soo Kim; Graduate School of Venture, Hoseo University, Mt.29-1, Sechul-Ri, Baebang-Myun, Asan City, Chung-nam, 336-795, South Korea
Sechul-Ri; Baebang-Myun, Asan City, Chung-nam, 336-795, South Korea
Young-Goo Kang and Hong Kim; Graduate School of Venture, Hoseo University, Mt.29-1, Sechul-Ri, Baebang-Myun, Asan City, Chung-nam, 336-795, South Korea
Chul Chung; ICES Co. Ltd., Graduate School of Venture, Hoseo University, Mt.29-1, Sechul-Ri, Baebang-Myun, Asan City, Chung-nam, 336-795, South Korea
Ho-Joon Lee; Department of Information and Telecommunication, Hoseo University, Mt.29-1, Sechul-Ri, Baebang-Myun, Asan City, Chung-nam, 336-795, South Korea
 

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