| Title |
Monitoring the Structural Behavior of Reinforced RC Slabs Using Optical Fiber-embedded CFRP Sheets |
| Authors |
김재환(Kim, Jaehwan) ; 정규산(Jung, Kyu-San) ; 김병철(Kim, Byeong-Cheol) ; 김건수(Kim, Kun-Soo) ; 박기태(Park, Ki-Tae) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.3.0311 |
| Keywords |
철근 콘크리트; BOTDR 센서; CFRP 시트; 변형률; 광섬유 Reinforced concrete; BOTDR sensor; CFRP sheet; Strain; Optical fiber |
| Abstract |
This study performed 4-point flexural tests of reinforced concrete to which was attached a distributed optical fiber sheet and carbon fiber reinforced polymer (CFRP) sheets in order to assess the effect of the CFRP sheets and the applicability of a BOTDR sensorsimultaneously. To evaluate the reinforcing effect, various degrees of CFRP sheet attachment were manufactured, and to evaluatethe sensing ability, strains obtained from a BOTDR sensor were compared with strains measured from electric resistance strain gauges that were attached to the concrete surface. From the results, the reinforcing effects were evidently different according to theattachment type of the CFRP sheets, and it was confirmed that the main influencing factor on the reinforcing effect was the type of attachment rather than the attachment area. The reinforced concrete structural behavior was visualized with strains measured from the BOTDR sensor as load increased, and it was identified that load was concentrated in the CFRP reinforced area. Strains from the BOTDR sensor were similar to those from the electric resistance strain gauge; thereby a BOTDR sensor can be effective in the analysis of structural behaviorsof massive infrastructure. Finally, the strain from a BOTDR sensor was high where CFRP sheet fall-off occurs, and it would therefore be efficient to track local damage locations of CFRP sheets by utilizing a BOTDR sensor. |