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권일범 ( Kwon Il-bum ),박휘립 ( Park Philip ),허용학 ( Huh Yong-hak ),김동진 ( Kim Dong-jin ),이동춘 ( Lee Dong-chun ),홍성혁 ( Hong Sung-hyuk ),문한규 ( Moon Hahngue ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
Fiber optic sensors can be embedded in the structures to get the health information in the structures. The fiber sensor was constructed with 3x3 fiber couplers to sense the multi-point strains and failure instants. The 2 RC(reinforced concrete) beams were made to one of A type, one of B type beams. These beams were reinforced by the steel bars, and were experimented under the flexural loading. The behavior of the beams was simultaneously measured by the fiber optic sensors, electrical strain gages, and LVDT. The states of the beams were interpreted by these all signals. By these experiments, There were verified that the fiber optic sensors could measure the structural strains and failure instants of the RC beams. The fiber sensors were well operated until the failure of the beams. It was shown that the strains of the reinforcing steel bar can be used to monitor the health of the beams through the flexural test of RC beams. On the other words, the results were arrived that the two strains in the reinforcing bar measured at the same point can give the information of the structural health status. Also, the failure instants of beams were well detected from the fiber optic filtered signals.