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Title |
Flexural Behavior Characteristics of Steel Tube Filled with PVA Fiber-reinforced Cement Composites (FRCCs) Incorporating Recycled Materials
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Authors |
윤현광(Hyun-Kwang Yoon) ; 김선우(Sun-Woo Kim) ; 장영일(Young-Il Jang) ; 김선웅(Sun-Woong Kim) ; 이종원(Jong-Won Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.3.275 |
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Keywords |
PVA 섬유보강 시멘트 복합체; 강관; 휨성능; 손상깊이; 응력 분배 PVA FRCCs; steel tube; flexural performance; denting depth; stress distribution |
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Abstract |
In this study, the flexural performance of steel tubes filled with PVA (Polyvinyl Alcohol) fiber-reinforced cement composites (FRCCs) was experimentally evaluated. For the experimental program, a total of four specimens were fabricated to evaluate the effects of recycled materials such as fly ash and recycled fine aggregate: STC specimen is plain mortar filled steel pipe; STF specimen is a steel pipe filled with PVA FRCCs; STFR1 specimen is a steel pipe filled with PVA FRCCs replaced with 25 % fly ash and 25 % recycled fine aggregate; STFR2 specimen is a steel pipe filled with PVA FRCCs replaced with 25 % fly ash and 50 % recycled fine aggregate. As a result, STFR1 and STFR2 specimens incorporating fly ash and recycled fine aggregate showed a tendency to increase the denting depth due to the lower elastic modulus and the higher Poisson’s ratio of the filling material. In view of energy dissipation capacity, the STFR1 and STFR2 specimens showed a greater contribution of denting depth to energy dissipation capacity due to the damage of the stressor than the STC and STF specimens, indicating that the redistribution capacity of the local damage was improved. In addition, when the PVA fiber was incorporated, the steel strain at the bottom of the mid-span was smaller than that at the top of the end due to the crack dispersion in the tension part, and the stress distribution was stable when the recycled materials were used.
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