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CFRP로 전단보강된 이후 동결융해를 경험한 철근콘크리트 보의 보강성능 및 음향방출 특성
전에스더 ( Cheon Esther ),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
This paper presents the results of an experimental program undertaken to investigate the shear strengthening performance, the fracture process and acoustic emission (AE) characteristics of reinforced concrete beams externally bonded CFRP (carbon fiber reinforced polymer) sheet and plate. Five small-scale concrete beams (100mm x 100mm x 400mm) were strengthened with CFRP sheet in shear, subjected to up to 30 freeze-thaw cycles, and tested to failure in four-point loading. The test data indicated that no significant damage to CFRP sheet and plate strengthened concrete beans had occurred because of freeze-thaw cycling. The test also demonstrated that acoustic emission is very sensitive to detect the initiation of tensile microcracks, main shear cracks and internal cracks generated near the interface between the CFRP and concrete.
CFRP로 전단보강된 이후 동결융해를 경험한 철근콘크리트 보의 보강성능 및 음향방출 특성
전에스더(Cheon Esther),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
This paper presents the results of an experimental program undertaken to investigate the shear strengthening performance, the fracture process and acoustic emission (AE) characteristics of reinforced concrete beams externally bonded CFRP (carbon fiber reinforced polymer) sheet and plate. Five small-scale concrete beams (100㎜ × 100㎜ × 400㎜) were strengthened with CFRP sheet in shear, subjected to up to 30 freeze-thaw cycles, and tested to failure in four-point loading. The test data indicated that no significant damage to CFRP sheet and plate strengthened concrete beans had occurred because of freeze-thaw cycling. The test also demonstrated that acoustic emission is very sensitive to detect the initiation of tensile microcracks, main shear cracks and internal cracks generated near the interface between the CFRP and concrete.
[제3분과/구조거동/재료] ABAQUS를 이용한 고인성 섬유보강 복합체의 비선형 유한요소해석
한민기(Han Min-Ki),전에스더(Cheon Esther),박완신(Park Wan-Shin),양일승(Yang Il-Seung),한병찬(Han Byung-Chan),윤현도(Yun Hyun-Do) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The role of fibers in fiber reinforced cement based composites was studied by means of finite clement method. A finite element study of compression, direct tension, and four point bending specimens made in high performance fiber reinforced cement composites(HPFRCCs) is studied using the finite element code ABAQUS. The major objective of the present study is to determine if the ABAQUS finite element program can used to accurately model the post-cracked mode of failure in plastic regions of HPFRCCs, and, if so, to develop practical failure criteria in the plastic range of the material response. The research comprises constitutive models to represent behavior of the cementitious composites on the basis of experimental data, development of techniques that are appropriate for analysis of HPFRCCs members, verification, and calibration of the global model for HPFRCCs of increasing complexity. The proposed FEA technique is verified by experimental benchmark data. Results from the analyses of these FEM models offers significant insight into the structural behavior of benchmark data.
ABAQUS를 이용한 고인성 섬유보강 복합체의 비선형 유한요소해석
한민기 ( Han Min-ki ),전에스더 ( Cheon Esther ),박완신 ( Park Wan-shin ),양일승 ( Yang Il-seung ),한병찬 ( Han Byung-chan ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
The role of fibers in fiber reinforced cement cased composites was studied by means of finite element method. A finite element study of compression, direct tension, and four point bending specimens made in high performance fiber reinforced cement composites(HPFRCCs) is studied using the finite element code ABAQUS. The major objective of the present study is to determine if the ABAQUS finite elemtnt program can used to accurately model the post-cracked mode of failure in plastic regions of HPFRCCs, and, if so, to develop practical failure criteria in the plastic range of the material response. The research comprises constitutive models to represent behavior of the cementitious composites on the basis of experimental data, development of techniques that are appropriate for analysis of HPFRCCs members, verification, and calibration of the global model for HPFRCCs of increasing complexity. The proposed FEA technique is verified by experimental benchmark data. Results from the analyses of these FEM models offers significant insight into the structural behavior of benchmark data.
박완신(Park Wan-Shin),윤현도(Yun Hyun-Do),전에스더(Cheon Esther),김선우(Kim Sun-Woo),지상규(Ji Sang-Gue),김윤수(Kim Yun-Su) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In this paper, workability, compressive strength of hybrid fiber reinforced cement composites(HFRCCs) have been investigated by means of Korean Standard Testing Methods (KSTM). Hybrid fiber reinforced cement composites(HFRCCs) contains the polyethylene terephthalate(PET), polyethylene (PE), and polyvinyl alcohol (PVA) fiber. As the result of the compressive strength tests, all the specimens show multiple cracking in the area subjected to the greatest compressive stress. In particular, test results showed that the hybrid fibers, PE and PVA specimen, could result in superior composite performance compared to their individual fiber reinforced cement composites, PET specimen.