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피로하중을 받는 탄소섬유메쉬로 휨보강된 철근콘크리트 보의 거동
전수만(Jeon Su-Man),성수용(Sung Soo-Yong),윤현도(Yun Hyun-Do),서수연(Seo Soo-Yeon) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
The aim of this study is to provide the basic data for fatigue behavior of RC beam strengthened with Carbon fiber mesh(CFM). The use of carbon fiber mesh reinforcements in concrete structure is expected to be increased, due to their high tensile strength, superior corrosion resistance, and good bonding performance. This study investigates the flexural performance and modes of failure of simply supported reinforcement concrete beams strengthened with externally bonded with CFM and mortar. The variable of experiment are the existence and location of clips, the chipping. The experimental results show that the RC beams strengthened with externally bonded CFM have more the fatugue capacity.
피로하중을 받는 탄소섬유메쉬로 휨보강된 철근콘크리트 보의 거동
전수만 ( Jeon Su-man ),성수용 ( Sung Soo-yong ),윤현도 ( Yun Hyun-do ),서수연 ( Seo Soo-yeon ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
The aim of this study is to provide the basic data for fatigue behavior of RC beam strengthened with Carbon fiber mesh(CFM). The use of carbon fiber mesh reinforcements in concrete structure is expected to be increased, due to their high tensile strength, superior corrosion resistance, and good bonding performance. This study investigates the flexural performance and modes of failure of simply supported reinforcement concrete beams strengthened with externally bonded with CFM and mortar. The variable of experiment are the existence and location of clips, the chipping. The experimental results show that the RC beams strengthened with externally bonded CFM have more the fatugue capacity.
CFRP 보강겹수에 따른 철근콘크리트 보의 균열위치추정에 관한 실험적 연구
전수만(Jeon Su-Man),이영오(Lee young-oh),김선우(Kim Sun-Woo),윤현도(Yun Hyun-Do),서수연(Seo Soo Yeon),최창식(Choi Chang Sik),최기봉(Choi Ki Bong) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
In recent years, CFRP(Carbon Fiber Reinforced Polymer) had been widely used for reinforcement of damaged concrete beams. This study was conducted to develop the crack location technique for CFRP retrofitted concrete beam using AE(Acoustic Emission) method. To experimentally prove the crack source location made of four reinforced concrete beams retrofitted by CFRP. The results compared the real cracking location with the source location has perceived by AE monitoring, before it is appeared the primary crack by visual observation. So, This study used by a basic data in constructing the system of the failure warning at application.
CFRP 보강겹수에 따른 철근콘크리트 보의 균열위치추정에 관한 실험적 연구
전수만 ( Jeon Su-man ),이영오 ( Lee Young-oh ),김선우 ( Kim Sun-woo ),윤현도 ( Yun Hyun-do ),서수연 ( Seo Soo Yeon ),최창식 ( Choi Chang Sik ),최기봉 ( Choi Ki Bong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
In recent years, CFRP(Carbon Fiber Reinforced Polymer) had been widely used for reinforcement of damaged concrete beams. This study was conducted to develop the crack location technique for CFRP retrofitted concrete beam using AE(Acoustic Emission) method. To experimentally prove the crack source location made of four reinforced concrete beams retrofitted by CFRP. The results compared the real cracking location with the source location has perceived by AE monitoring, before it is appeared the primary crack by visual observation. So, This study used by a basic data in constructing the system of the failure warning at application.
전단 파괴형 철근콘크리트 보에서 순환골재의 치환율에 따른 음향방출 특성
김윤수 ( Kim Yun-soo ),이영오 ( Lee Young-oh ),전수만 ( Jeon Su-man ),윤현도 ( Yun Hyun-do ),유영찬 ( You Young-chan ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
Recently, construction wastes are increasing at every year. So problem of environmental pollution and lack of natural aggregates are serious. To solve this problem, the use of recycled aggregate is necessary. In this paper, failure behavior of recycled coarse aggregates reinforced concrete beam using recycled coarse aggregates with different replacement levels of recycled coarse aggregates are investigated using acoustic emission(AE). For these purpose, four recycled coarse aggregates replacement level (i.e 0%, 30%, 60% and 100%) were considered: As the load increased, AE signals were generated by internal crack propagation within the specimen. These AE signals were detected with AE sensors attached on the front of surface of the specimen. Result from this study show AE signal, AE method can apply to investigate a failure mode of reinforce concrete beam according to recycled coarse aggregates replacement level.
이영오(Lee Young-Oh),전수만(Jeon Soo-Man),김선우(Kim Sun-Woo),윤현도(Yun Hyun-Do),서수연(Seo Soo-Yeon),최창식(Choi Chang-Sik),최기봉(Choi Ki-Bong) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
Concrete is deformed by load and subjected to micro damage under allowable deformation because of non-homogeneous property. When micro damage is accumulated, it is cracked and finally fractured. Characterization of AE can be demonstrated the micro damage which it is not discovered from visual observation and it become known to an advantage that was discriminated from the existing nondestructive technique method. The aim of this study was to examine the emission of acoustic signals from four CFRP reinforced concrete beams at cracking and failure processes and the failure mechanism of specimens.
이영오 ( Lee Young-oh ),전수만 ( Jeon Soo-man ),김선우 ( Kim Sun-woo ),윤현도 ( Yun Hyun-do ),서수연 ( Seo Soo-yeon ),최창식 ( Choi Chang-sik ),최기봉 ( Choi Ki-bong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Concrete is deformed by load and subjected to micro damage under allowable deformation because of non-homogeneous property. When micro damage is accumulated, it is cracked and finally fractured. Characterization of AE can be demonstrated the micro damage which it is not discovered from visual observation and it become known to an advantage that was discriminated from the existing nondestructive technique method. The aim of this study was to examine the emission of acoustic signals from four CFRP reinforced concrete beams at cracking and failure processes and the failure mechanism of specimens.
전단 파괴형 철근콘크리트 보에서 순환골재의 치환율에 따른 음향방출 특성
김윤수(Kim Yun-Soo),이영오(Lee Young-Oh),전수만(Jeon Su-Man),윤현도(Yun Hyun-Do),유영찬(You Young-Chan) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
Recently, construction wastes are increasing at every year. So problem of environmental pollution and lack of natural aggregates are serious. To solve this problem, the use of recycled aggregate is necessary. In this paper, failure behavior of recycled coarse aggregates reinforced concrete beam using recycled coarse aggregates with different replacement levels of recycled coarse aggregates are investigated using acoustic emission(AE). For these purpose, four recycled coarse aggregates replacement level (i.e 0%, 30%, 60% and 100%) were considered: As the load increased, AE signals were generated by internal crack propagation within the specimen. These AE signals were detected with AE sensors attached on the front of surface of the specimen. Result from this study show AE signal, AE method can apply to investigate a failure mode of reinforce concrete beam according to recycled coarse aggregates replacement level.
CFRP 판으로 전단 보강된 이후 동결융해에 노출된 철근콘크리트 보의 거동 및 음향방출 특성
윤현도(Yun Hyun-Do),김선우(Kim Sun-Woo),이영오(Lee Young-Oh),전수만(Jeon Soo-Man),서수연(Seo Soo-Yeon),최기봉(Choi Ki-Bong) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
External plating of reinforced concrete (RC) structures with carbon fiber-reinforced polymer (CFRP) plate, sheets, or both, is now a widely recognized as repair and retrofit technique. CFRP sheets and plates are being used to strengthen outside concrete structures. The CFRP reinforcements are bonded to beams and slabs using structural adhesives. Adhesive strength can be affected by environmental exposure. During freezing-and-thawing cycling, temperature-induced stresses in the adhesive layer, due to differential thermal expansion between the CFRP and the substrate concrete, may lead to bond damage and contribute to or cause premature CFRP composite separation. This paper presents the results of experimental program undertaken to investigate the effects of freeze-thaw cycling (from -18 to 4℃) on the behavior and failure characteristics of RC beams strengthened in shear with CFRP plate using acoustic emission (AE) technique. The beams were plated with CFRP plate (S system, thickness of 1.2 ㎜, tensile strength of 2,800 MPa) then were subjected to between 0 and 400 freezing-and-thawing cycles. Based on the results presented, freezing-and-thawing cycling between 0 and 120 cycles does not appear to significantly affect the overall load deflection behavior, the crack development, and strain distributions of RC beams strengthened in shear with CFRP plate. But CFRP-strengthened concrete beams exposed to more than 240 freezing-and-thawing cycles exhibited 10% reduction in strength compared to CFRP-strengthened RC beam without being exposed to freezing-and-thawing. The AE-b value derived from the frequency-amplitude distribution of AE signals, was compared with the development of fracture process of CFRP-strengthened RC beams.