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CFRP 긴장재로 프리스트레트된 콘크리트보의 피로 거동
정상모 ( Jeong¸ S. M. ),이차돈 ( Lee¸ C. D. ),박상렬 ( Park¸ S. Y. ),조만영 ( Cho¸ M. Y. ),( Jeong¸ W. T. ),정우태 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
In the applications of FRP materials, it seems the most efficient to use them as pre-stressing tendons, considering their high strength. However, the lack of ductility is of most concern due to their linear elastic behavior up to rupture. In order to solve this ductility problem, a new concept of prestressed concrete beam is proposed, introducing internally un-bonded CFRP tendons. It is essential to verify the long-term safety for repetitive fatigue loads under service states, as well as the safety at the ultimate state. For this purpose, flexural fatigue loading tests were carried out for three test beams. The results showed that the beams prestressed with CFRP tendons had enough safety under fatigue loads, although additional more tests are required in the future.
수압구동 전열관다발 부분 삽입형 증기발생기 세정장비 설계
김석태(S.T. Kim),정우태(T.W. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The sludge grown up in steam generators of nuclear power plants shortens the life-cycle of steam generators and reduces the output of power plants. So KHNP(Korea Hydro and Nuclear Power), the only nuclear power utility in Korea, removes it periodically using a steam generator lancing system during the outage of plants for an overhaul. KEPRI(Korea Electric Power Research Institute) has developed lancing systems with high pressured water nozzle for steam generators of nuclear power plants since 2001. In this paper, the design of a partial inter-tube lancing system for model F type steam generators will be described. The system is actuated without a DC motor inner steam generators because the motors in a steam generator make a trouble from high intensity of radioactivity as a break down.