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폴리머 개질 경량콘크리트 일방향 부재의 휨 거동에 관한 실험적 연구
변은혁,김민숙,이영학,김희철,Byon, Eun-Hyuk,Kim, Min-Sook,Lee, Young-Hak,Kim, Hee-Cheul 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.5
본 연구는 경량콘크리트와 폴리머 개질 경량콘크리트 보에 있어 현행 최소허용철근변형률 기준의 타당성과 최외단 철근의 순인장 변형률에 따른 휨 거동 및 휨 성능을 평가하는 것에 그 목적이 있다. 크기와 형상이 동일한 8개의 시험체를 제작하여 콘크리트의 종류와 최외단 철근의 순인장 변형률을 변수로 실험을 수행하였으며, 이를 통해 순인장 변형률에 따른 경량콘크리트 보와 폴리머 개질 경량콘크리트 보의 강도와 연성의 변화를 분석하였다. 실험 결과 경량콘크리트 보와 폴리머 개질 경량콘크리트 보 모두에서 최외단 철근의 순인장 변형률이 증가할수록 시험체의 연성이 증가하였으며, 특히 최외단 철근의 순인장 변형률 0.005이상에서 보통 중량 콘크리트와 유사한 연성지수를 확보할 수 있었다. The purpose of this study is to estimate experimentally the flexural behavior, capacity and validity of existing regulation of net tensile strain in lightweight concrete beams and polymer modified lightweight concrete beams. One normal weight concrete beam and four lightweight concrete beams, three polymer modified lightweight concrete beams were constructed as same figure and attempted to evaluate the difference of strength and ductility in specimens of different net tensile strain in extreme tension steel. Test results are indicated in terms of load-deflection behavior and ductility index. As the value of net tensile strain increased, the flexural strength and stiffness of specimen decreased but ductility index increased in both of lightweight concrete beams and polymer modified lightweight concrete beams. It is considered that to achieve similar ductility index of normal weight concrete, net tensile strain in extreme tension steel should exceed 0.005 for lightweight concrete beam and polymer modified lightweight concrete beam.
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FRP Sheet와 비좌굴 가새를 적용한 보-기둥 접합부의 횡방향 보강효과에 관한 실험적 연구
변은혁,김민숙,이영학,김희철 한국지진공학회 2011 한국지진공학회논문집 Vol.15 No.1
FRP Sheet와 비좌굴가새를 적용한 보-기둥 접합부의 보강효과를 평가하기 위하여 보-기둥 접합부 실험체에 축력 및 반복 횡가력을 가하여 실험을 수행하였다. 동일한 크기의 6개의 실험체를 제작하였으며 FRP Sheet의 종류 및 비좌굴 가새의 유무를 변수로 하였다. 실험체의 파괴양상 및 최대하중, 연성지수, 에너지소산능력의 측면에서 실험결과를 분석하였다. 실험결과 CFRP Sheet와 비좌굴가새를 혼용한 보강방법이 가장 우수한 성능을 나타냈다. The strengthening effect of CFRP sheet and AFRP sheet with buckling-restrained brace for Beam-Column joints under constant axial and cyclic lateral loading is evaluated experimentally in this paper. Six test specimens were constructed. The main test parameters included the FRP Sheet and Buckling-restrained braces. The results of the tests were analyzed by focusing on their mode of failure, maximum load, ductility indexes, and energy dissipation capacity. Test results indicated that CFRP Sheet with the buckling-restrained brace system significantly increased the strength and stiffness of the specimen and that it was the most adequate retrofitting method.
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CFRP Sheet를 이용한 철근콘크리트 프레임면내 조적벽체의 전단내력 평가에 관한 실험적 연구
이영학,김민숙,변은혁,김희철 한국지진공학회 2010 한국지진공학회논문집 Vol.14 No.1
본 연구는 반복 횡하중 하에서 CFRP(Carbon Fiber Reinforced Polymer) Sheet로 보강된 철근콘크리트 프레임면내 조적벽체의 전단내력을 평가하여 국내 조적벽체 학교 건축물에 적합한 CFRP Sheet 보강 방안을 제안하는 것에 그 목적이 있다. 조적 허리벽이 있는 1층, 1경간, 1/2 스케일의 시험체를 4개 제작하여 CFRP Sheet의 보강량을 변수로 실험을 수행하였으며 이를 통하여 보강량에 따른 강도와 강성의 변화를 분석하였다. 실험 결과 CFRP Sheet는 시험체의 내력과 강성을 향상시켰으며 특히 기둥과 조적벽을 모두 보강하는 방법을 통한 보강방법에 있어 그 적용성을 확인할 수 있었다. The purpose of this study is to investigate experimentally the behavior of unreinforced masonry RC frames strengthened by CFRP sheet under cyclic lateral loading. Four test specimens were constructed as one-story, one-bay, 1/2 scale unreinforced masonry infilled RC frames and differences in strength and stiffness were evaluated in specimens on which had been applied different retrofitting methods. Test results indicated that the CFRP sheets significantly increased the strength and stiffness of the specimens, and the specimens retrofitted in columns and masonry indicated the most adequate retrofitting methods.
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김영주,오상훈,윤명호,김희철,변은혁,이영학 한국강구조학회 2009 International Journal of Steel Structures Vol.9 No.4
On the bases of a decreased construction period and convenience of construction, the steel deck plate system has been widely used in the construction field in Korea. In particular, due to its good stiffness and economic considerations, the steel-wireintegrated deck plate system (or truss deck plate system) has become very popular in recent years. But while it offers many advantages, the truss deck plate system has a critical defect: rust forms in the welding joints between the lattice steel wire and the deck plate, resulting in the cracking of these welding joints and water leakage. To address these problems, the TOX deck plate system, a new type of truss deck plate system that does not require welding and does not rust, is proposed in this paper. Tests have been conducted on 15 specimens to evaluate the structural safety of the proposed deck plate system during the construction stage. The test parameters were as follows: the depth of the slab, the length of the span, the diameters of the top, bottom, and lattice steel wire, and the material properties of the zinc-coated steel sheets. The test results show that the TOX deck plate system can guarantee structural safety owing to its deflection and strength. On the bases of a decreased construction period and convenience of construction, the steel deck plate system has been widely used in the construction field in Korea. In particular, due to its good stiffness and economic considerations, the steel-wireintegrated deck plate system (or truss deck plate system) has become very popular in recent years. But while it offers many advantages, the truss deck plate system has a critical defect: rust forms in the welding joints between the lattice steel wire and the deck plate, resulting in the cracking of these welding joints and water leakage. To address these problems, the TOX deck plate system, a new type of truss deck plate system that does not require welding and does not rust, is proposed in this paper. Tests have been conducted on 15 specimens to evaluate the structural safety of the proposed deck plate system during the construction stage. The test parameters were as follows: the depth of the slab, the length of the span, the diameters of the top, bottom, and lattice steel wire, and the material properties of the zinc-coated steel sheets. The test results show that the TOX deck plate system can guarantee structural safety owing to its deflection and strength.
ScienceON
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