헤테로코어형 광파이버 센서를 이용한 콘크리트 변형량 측정용 노출형 센서모듈의 개발
- Abstract
- The prestressed concrete(PSC) are widely applied to important social infrastructure facilities such as bridges and containment structures for nuclear power generation. In order to ensure the safety of the citizens and reliable service, it is critical to maintain PSC structures properly during its design life.
The prestress is applied to concrete using steel strands or bars for improved structural efficiency of bridges. However, loss of prestress occurs continually during the service life from the construction period. Therefore, the change in prestress should be measured on a regular basis to make sure the safety of the structures. Especially, the breakage accident of strands of the Jeongneung-cheon overpass in the Seoul inner ring road was a great shock to many civil-engineers. This has increased interests in prestress measurement technology during the service life in addition to management of the prestress during the construction period.
Recently, many studies have been conducted on the technological convergence of the structure health monitoring(SHM) technology with the information technology. In several countries such as the United States of America, Europe, and Japan, various studies were carried out on the use of optical fibers for measurement of the prestress of PSC bridges during service period.
It is possible for the hetero-core optical fiber to measure the tensile and compressive strain according to the way to set up the sensor module. The sensor should have the capacity for measuring the stress variation in 0.1MPa and the resolution of 1㎛. Thus, a 300㎜ sensor module was devised from the correlation between the stress and the length of sensor module.
In order to satisfy the performance criterion of the sensor module, experiments for the performance evaluation using the exposed sensor module were conducted. According to the experiment results, when the displacement control velocity were 0.12 and 1.80mm/min, the delays in measurement were 52.1 and 2.6sec respectively, which shows the maximum 19 times delay in measurement between the cases.
Due to the measurement delay phenomena, the sensor module used in the experiments cannot be employed to check out the real time state of the structure. Thus, additional experiments were needed to develop a new sensor module capable of measuring the real time state of the structure.
Three experiments were carried out to investigate the cause of measurement delay phenomena. And, it was confirmed that measurement delay is mainly attributed to the frictional resistance. The measurement delay phenomena were not observed in the experiments using the friction-removed device.
Through this study, exposed sensor module for measuring deformation of concrete using hetero-core optical fiber sensor was developed, and verified the possibility of its commercialization. The results of this study can be used as basic materials for the future studies on developing an embedded sensor module that can directly measure prestress in concrete.
- Issued Date
- 2020
- Awarded Date
- 2020. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 토목공학과
- Advisor
- 이환우
- Table Of Contents
- Ⅰ. 서 론 1
1.1 연구배경 1
1.2 연구동향 3
1.2.1 PS 긴장력 계측 및 손실 연구현황 3
1.2.2 긴장력 계측센서의 연구동향 4
1.3 연구목적 5
1.3.1 연구의 필요성 5
1.4 연구방법 7
1.4.1 압축형 센서의 개요 7
1.4.2 단계별 연구계획 7
Ⅱ. 계측센서 8
2.1 선행연구 사례조사 8
2.1.1 구조물 건전성 모니터링(SHM)의 소개 8
2.1.2 PSC 구조물의 SHM 9
2.2 SHM 센서 12
2.2.1 센서의 개요 12
2.2.2 격자기반 센서 14
2.2.3 간섭계 센서 21
2.2.4 분포형 센서 34
2.2.5 자기장 센서 41
2.3 연구용 센서모듈의 개발 46
2.3.1 센서모듈 개발의 필요성 46
2.3.2 센서모듈 제작 및 형상계획 46
2.3.3 센서모듈 성능실험 계획 51
Ⅲ. 센서의 분해능 확인실험 52
3.1 실험개요 52
3.2 실험장비 53
3.2.1 전압, 변위 실험장비 53
3.2.2 전력, 변위 실험장비 54
3.3 실험방법 55
3.3.1 전압, 변위 실험방법 55
3.3.2 전력, 변위 실험방법 57
3.4 분해능 확인 실험결과 59
3.4.1 전압, 변위 실험결과 59
3.4.2 전력, 변위 실험결과 60
3.4.3 분해능 실험결과 62
Ⅳ. 센서모듈 압축 성능실험 63
4.1 실험개요 63
4.2 실험장비 64
4.2.1 주요 실험장비 64
4.2.2 노출형 센서모듈 65
4.2.3 계측데이터 측정장치 66
4.3 실험방법 67
4.3.1 콘크리트 공시체 제작 67
4.3.2 공시체 압축강도 실험 68
4.3.3 각주형 공시체 실험 68
4.4 실험결과 분석방법 71
4.4.1 분석방법의 개요 71
4.4.2 다항식 회귀분석 방법 73
4.4.3 상관관계의 분석방법 75
4.5 센서모듈 압축성능 실험결과 77
4.5.1 압축강도 실험결과 77
4.5.2 상관관계 분석결과 82
4.5.3 센서모듈 압축성능 실험결과 93
Ⅴ. 센서모듈 인장·압축 성능실험 95
5.1 실험개요 95
5.2 실험장비 96
5.2.1 주요 실험장비 96
5.2.2 계측데이터 측정장치 98
5.3 실험방법 99
5.3.1 각주형 콘크리트 공시체 실험방법 99
5.3.2 원형강관 공시체 실험방법 100
5.4 센서모듈 인장·압축 성능실험 결과 102
5.4.1 각주형 콘크리트 공시체 실험결과 102
5.4.2 원형강관 공시체 실험결과 103
Ⅵ. 센서모듈 성능개선 실험 105
6.1 실험개요 105
6.2 실험장비 106
6.2.1 주요 실험장비 106
6.2.2 전동변위 측정장치 107
6.2.3 전력량 측정장치 108
6.3 실험방법 110
6.3.1 센서모듈 성능확인 실험방법 110
6.3.2 센서모듈 성능개선 실험방법 111
6.4 센서모듈 성능확인 실험결과 114
6.5 센서모듈 성능개선 실험결과 117
6.5.1 마찰저항 개선 실험결과 117
6.5.2 광원장치 변경 실험결과 118
6.5.3 센서규격 변경 실험결과 119
6.5.4 마찰저항이 제거된 검증용 센서모듈의 실험결과 120
6.5.5 센서모듈 성능개선 실험결과 124
Ⅶ. 결론 125
참고문헌 127
부 록 139
부록 A, 각주형 공시체 압축성능 실험결과 139
부록 B, 센서모듈 인장·압축 성능실험 결과 149
부록 B, 센서모듈 성능개선 실험결과 155
- Degree
- Doctor
- Files in This Item:
-
-
Download
헤테로코어형 광파이버 센서를 이용한 콘크리트 변형량 측정용 노출형 센서모듈의 개발.pdf
기타 데이터 / 13.29 MB / Adobe PDF
-
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.