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박완신,윤현도,장영일,김선웅 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
In this study, an experimental research is performance to investigate the strain characteristics of steel coupled beam connections. The test variables of this study are the embedment length.
박완신(Park Wan-Shin),윤현도(Yun Hyun-Do) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Experimental and theoretical studies were conducted to propose the equation for predicting the shear strength of high performance fiber reinforced cementitious composites (HPFRCCs) coupling beam with steel fiber and polyethylene. Finally, this paper provides background for simplified design equation to predict the shear strength of HPFRCCs coupling beam with steel fiber and polyethylene.
섬유의 혼입이 변형 경화형 시멘트 복합체에 미치는 영향
박완신(Park Wan-Shin),윤현도(Yun Hyun-Do),전에스더(Jeon Esther),남상현(Nam Sang-Hyun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.11
Strain hardening cement-based composite(SHCC) is a relatively new class of high performance fiber reinforced cement composites(HPFRCCs). The SHCC exhibits significant pseudo strain - hardening behaviour due to the controlling well the opening of the crack widths because of bridging action. In this paper, compressive properties of cement-based composites (CBCs) reinforced with polythylene terephthalate have been investigated by conforming to Korean Standard (KS). The CBCs contains the polyethylene terephthalate(PET), polyethylene (PE), and polyvinyl alcohol (PVA) fiber. This paper reports the results of mechanical properties in terms of failure mode, strain - stress relationship, elasticity modulus characteristics, stiffness characteristics, dissipated energy characteristics.
PET 합성섬유의 혼입조건에 따른 시멘트 복합체의 변형경화 특성
박완신(Park Wan-Shin),윤현도(Yun Hyun-Do),전에스더(Jeon Esther) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.10
The application of strain-hardening cement composites(SHCC) to structural systems depends primarily on the tensile response of the materials, which is a direct function of fiber and matrix characteristics, the fiber content or volume fraction, and the bond capacities between them. In general, improved response of material is observed with an increase in the fiber volume fraction, as long as the fiber content does not impede mixing. This paper discusses the result of the direct tensile response of cement composites reinforced with PET fibers. The main variables are included specimens with different types of fibers(PET, PET+PE, PET+PVA) and fiber volume fraction with 1.5%, 2.0%. Test results showed that the specimens with PET and PE fibers showed better overall behavior than those with only PET fibers. Moreover, their post-cracking strength was 3.9 times their first cracking strength, while for specimens with PET fibers, the post-cracking strength was only 102% higher than the cracking strength, especially, in series Ⅰ. For the same type of fiber, increase of the volume fraction leads to a marked improvement in the post-cracking strength, ductility, or energy absorption capacity of the composites. PET+PE reinforced specimens provided the best tensile strength (5.2㎫ for vf=2.0%), while PET+PVA reinforced specimens provided the best ductility, e.g. they were able to maintain hardening response up to about 2% strain.