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동결융해작용에 따른 CFRP보강 콘크리트 보의 계면전단응력에 관한 연구
류용열 ( Ryu Yong Yeol ),김정우 ( Kim Jung Woo ),최형석 ( Choi Hyoung Suk ),정진환 ( Cheung Jin Hwan ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
In this paper, concrete beams exposed to various conditions of freeze-thaw cycle were tested to study the interfacial shear stress of carbon fiber sheet due to temperature change. After 0, 100, 200, 300 cycles freeze and thawing process of each specimen, 3 points bending test was performed and mid-point deflection and strain of the fiber sheet surface are measured. In case of 0 cycle, the test specimen was destroyed by the carbon sheet rupture and the other cases were failed by the end interfacial debonding between carbon fiber sheet and concrete. As increasing freeze-thaw cycles, the maximum bending moment was decreased by 7% and the ductility ratio was decreased by 33%. Due to effect of freeze-thaw cycles, the interfacial shear stress occurs on concrete beam and carbon fiber sheet interface. Therefore, in the case of using carbon fiber sheet for strengthening the concrete beam, it is necessary to consider the effect of temperature change and to evaluate the long time behavior of the concrete beam by it.
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동결융해작용에 따른 CFRP보강 콘크리트 보의 계면전단응력에 관한 연구
류용열(Ryu, Yong Yeol),김정우(Kim, Jung Woo),최형석(Choi, Hyoung Suk),정진환(Cheung, Jin Hwan) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this paper, concrete beams exposed to various conditions of freeze-thaw cycle were tested to study the interfacial shear stress of carbon fiber sheet due to temperature change. After 0, 100, 200, 300 cycles freeze and thawing process of each specimen, 3 points bending test was performed and mid-point deflection and strain of the fiber sheet surface are measured. In case of 0 cycle, the test specimen was destroyed by the carbon sheet rupture and the other cases were failed by the end interfacial debonding between carbon fiber sheet and concrete. As increasing freeze-thaw cycles, the maximum bending moment was decreased by 7% and the ductility ratio was decreased by 33%. Due to effect of freeze-thaw cycles, the interfacial shear stress occurs on concrete beam and carbon fiber sheet interface. Therefore, in the case of using carbon fiber sheet for strengthening the concrete beam, it is necessary to consider the effect of temperature change and to evaluate the long time behavior of the concrete beam by it.
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COD(Crack Opening Displacement) 측정을 통한 강재의 피로균열진전속도 추정에 관한 실험적 연구
김광진,김인태,류용열,Kim, Kwang-Jin,Kim, In-Tae,Ryu, Yong-Yeol 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.6
강구조물의 점검시 피로균열이 발견되는 경우에는 보수 보강 시행의 결정과 구조물의 점검주기 결정을 위한 균열의 현재 상태평가와 앞으로의 균열진행 정도에 대한 정량적인 예측이 요구된다. 피로균열에 대한 손상도 평가는 파괴역학 파라미터를 이용한 균열진전속도와 취성파단의 여부 결정이 대표적인 방법으로 파괴역학에 관한 전문적인 지식과 함께 수치해석 프로그램의 활용능력이 필요하다. 이에, 본 연구에서는 피로손상도 평가 방법에 관한 다양성을 확보하고, 파괴역학에 대한 전문적인 지식이 없는 기술자가 피로균열에 의한 강구조물의 손상도를 간편하게 평가 할 수 있는 방법을 개발하기 위한 첫 단계로, 관통균열 시험편을 이용한 균열진전시험을 실시하였다. 그리고 피로균열 표면으로부터 측정된 COD(Crack Opening Displacement)의 크기와 측정위치를 이용하여, 균열진전속도를 추정하기 위한 파라미터를 도출하고, 그 타당성을 분석하였다. 그리고 관통균열이 있는 시험편의 형상, 응력범위, 그리고 응력비에 상관없이 COD를 이용하여 피로균열진전속도를 추정할 수 있는 방법을 제시하였다. Steel structures have a higher probability of being damaged by fatigue than by other causes of deterioration. As such, their maintenance to prevent fatigue damage is essential to sustain their safety and performance during their service period. In their maintenance, the current state of their fatigue cracks must be assessed to determine appropriate reinforcement methods and the suitable time intervals of periodic inspections when fatigue cracks are detected. Determining the crack growth rate is a successful method of predicting fractures, but it requires technical knowledge on fracture mechanics and experience in numerical methods and software for finite element analysis. In this study, a fatigue crack growth test on through-thickness cracked steel plates was conducted to assess the crack growth rate without superior technical knowledge and experience. The relationship between the Crack Opening Displacement (COD) and the crack growth rate was found in relatively long fatigue cracks.
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