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국내 철근콘크리트 학교건물의 내진보강 후 내진성능평가 연구
류승현 ( Ryu Seung-hyun ),김선우 ( Kim Sun-woo ),윤현도 ( Yun Hyun-do ),이강석 ( Lee Kang-seok ),김용철 ( Kim Yong-cheol ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
The main purpose of this paper is to evaluate seismic performance of domestic reinforced concrete (RC) school buildings in Korea using the non-linear static analysis. In this study, the seismic performance of an existing RC school building was evaluated for the seismic retrofitting. It was thought that these results would contribute to improving the seismic retrofitting method for Korean RC school buildings.
CSA계 팽창재 종류 및 대체율에 따른 섬유보강 시멘트 복합체의 역학적 특성
류승현(Ryu Seung-Hyun),김종필(Kim Jong-Pil),이영오(Lee Young-Oh),윤현도(Yun Hyun-Do) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.6
This paper discusses the results of an investigation on the influence of calcium sulfoaluminate (CSA) based expansive admixtures (EXA) on the mechanical and cracking properties of fiber-reinforced cement-based composite (FRCC). The specific compressive strength of FRCC matrix was 70 MPa and this FRCC matrix was reinforced with 1.5% polyethylene fibers (PE) by volume fraction. Two independent variables such as EXA type (Type-1 and Type-2) and percentages of EXA as cement replacement (0, 8, 10, 12 and 14% by mass) were used for the design of FRCC mixtures. The mechanical properties of FRCC such as uniaxial tensile, flexure, and compressive properties, as well as crack development and shrinkage behavior were evaluated to examine the effects of EXA on the performance of FRCC. The results indicated that 8 to 10% replacement of EXA could significantly increase compressive, flexural and tensile strength of FRCC manufactured in this study. In addition to its efficient shrinkage reducing effect, it was observed that 8 to 10% of EXA content decreased initial shrinkage cracking and induced multiple and narrow cracks in the FRCC specimen under flexure and direct tension properties.
류승현(Ryu Seung Hyun),송영재(Song Young Jae),김성호(Kim Sung Ho),이영오(Lee Young Oh),윤현도(Yun Hyun Do) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The principal aim of this paper is to present the basic data for the flexural behavior evaluation of high-strength concrete/SHCC beams reinforced with high-performance reinforcing bars. Accordingly, flexural tests were conducted on beam specimens having compressive strength of 70 MPa. The test results showed ductility and strength improvement of SHCC beam reinforced with high-performance reinforcing bar compared with concrete beam.