논문 상세보기
pp.10-16
The predominant superstructure in recent construction projects is the PSC I girder, which employs tension materials such as steel strands. However, over 50% of PSC I girders that have been in service for more than five decades are rapidly deteriorating. This aging trend underscores the urgent need for safety management measures for bridge facilities. The existing methods for measuring the tension of steel tendons are either limited in terms of measurement capabilities or are plagued by issues related to corrosion damage. Consequently, there is a pressing demand for noncorrosive materials and technologies that can provide measurements at multiple points. This study focuses on conducting various performance experiments aimed at developing tension materials made of carbon fiber reinforced polymer (CFRP) using optical fibers. The goal is to create a proactive safety management strategy for bridge facilities and to implement these materials in practical applications. The measurement performance of CFRP tendons, utilizing optical fiber sensors, was found to be consistent within a 3.7% margin of error. It was confirmed that CFRP tendons can effectively serve as sensing tension materials because they can provide measurements up to the point of tendon breakage. In addition to short-term performance evaluations, long-term experiments were conducted to assess field application viability. Relaxation exhibited a standard value of 2.5%, and fatigue tests revealed that tensile performance remained unchanged even after 2 million cycles, adhering to road bridge design standards. The implementation of CFRP tendons with embedded sensing capabilities in bridge facilities opens up the possibility of proactive safety management, as it enables real-time monitoring of the facility’s stress state.
본 연구에서는 광섬유를 이용한 탄소섬유복합재료(CFRP) 긴장재 개발을 목표로 다양한 성능실험을 수행하였다. 광섬 유 센서를 활용한 탄소섬유 긴장재의 계측성능은 부착된 변형률 게이지의 계측 값과 비교한 결과, 3.7% 이내로 동일한 계측을 하는 것으로 나타났고, 탄소섬유 긴장재 파단까지 계측이 가능하기 때문에, 센싱용 긴장재로 활용이 가능함을 확인하였다. 현장 적용을 위한 장기성능 실험결과, 릴렉세이션의 경우 저릴렉세이션 강연선 기준 값인 2.5%를 만족하였고 피로시험의 경우 도로 교설계기준을 준용하여 200만회 이후 인장성능의 변화가 없는 것을 확인되어, 탄소섬유 긴장재 뿐만 아니라 정착구도 장기성능 을 확보한 것으로 판단된다
2. 탄소섬유 복합재료
2.1 섬유강화 복합재료
2.2 탄소섬유 긴장재 생산
2.3 탄소섬유 긴장재 개발 및 활용 과정
3. 센싱 긴장재 개발
3.1 교량 현황 및 기존 긴장재의 문제점
3.2 국외 탄소섬유 긴장재
3.3 광섬유 센서 내장 탄소섬유 긴장재
4. 탄소섬유 긴장재 장기성능 평가 및 활용
5. 결 론
ACKNOWLEDGMENT
