| Title |
Strain Response Analysis of RC Beams Strengthened with Optical Fiber-embedded CFRP Sheet |
| Authors |
심원보(Shim, Won-Bo) ; 홍기남(Hong, Ki-Nam) ; 연영모(Yeon, Yeong-Mo) ; 정규산(Jung, Kyu-San) |
| DOI |
https://doi.org/10.12652/Ksce.2020.40.4.0363 |
| Keywords |
BOTDR 센서;CFRP 쉬트;비부착 위치;전기저항 변형율 게이지 BOTDR sensor;CFRP sheet;Unbonded position;Electric resistance strain gauge |
| Abstract |
This paper reports the results of an experimental study using the BOTDR sensor to detect the unbonded location of attached CFRP sheet for structural rehabilitation. A specimens with the unattached CFRP sheet were fabricated for this study, on which BOTDR sensor was attached with a nylon net. During the flexural test of the specimens, the strain of the CFRP sheet was measured using the BOTDR sensor and electric resistance gauges. From the results, it was confirmed that the strain distribution obtained through the BOTDR sensor can be effectively used to visualize and detect the unbonded position of the CFRP sheet. In addition, In addition, the strain measured by the BOTDR sensor was found to be more effective in analyzing the overall structure behavior than the electric resistance strain gauge. The development of a BOTDR sensor with a measuring longth of less than 100 mm will enable accurate detection of the local unbonded position of the CFRP sheet. |