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컷오프근을 가지는 RC 보 부재에서의 전단저항기구와 주근 부착작용과의 관계
김길희 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.11
A method proposed to estimate required length of double-layered flexural reinforcing bars for RC beam. This research deals with deep beams, in which shear reaction is dominant and no plastic hinge is formed. The ACI and AIJ guidelines(Architectural Institute of Japan) present a method to determine the length double-layered bars, typically foundation beams, although theoretical and experimental bases are not described.A series of experimental work was conducted to measure the bond strength of double-layered bars. The method to estimate the double-layered length and shear strength of short shear span ratio beam are then developed based on a concept of partial truss mechanism.
Bond-Strengthening Hooks for RC Members with High Strength Spirals
김길희,Yuichi Sato 한국콘크리트학회 2005 콘크리트학회논문집 Vol.17 No.5
This paper presents an experimental investigation of bond-strengthening hooks as a new method to increase bond strength along flexural reinforcing bars in reinforced concrete (RC) beams and columns. The RC members, which consisted of 1,300 MPa-class spirals as shear reinforcement, often suffered from bond splitting failure. The proposed method attempts to increase confining stiffness around the flexural bars by placing U-shaped hooks and to prevent premature bond splitting failure. Twelve specimens with varied amounts and sizes of the hooks were prepared to verify the strengthening effectiveness under monotonic and cyclic loading conditions. The test result indicated that the hooks increased the bond strength along the flexural bars although the strengthening effectiveness was limited by effective reinforcement ratio pbe. This limit is determined by size of stress-transmitting zones of concrete around anchors of the hooks. Anchors of the hooks are recommended to be longer than twelve times the hook diameter and inserted deeper than a quarter of the member depth (D/4). Proposed design equations provide modest estimates of the shear strengths.
전기로 산화슬래그 골재를 사용한 RC 보의 휨 거동에 관한 실험적 연구
김길희(Kim Kil-Hee),류득현(Ryu Deug-Hyun),김상우(Kim Sang-Woo),임지영(Lim Ji-Young),이정미(Lee Jung-Mi),이용준(Lee Yong-Jun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.10
The electric arc furnace slag generated by the steel industry has CaO and SiO₂, as main ingredients, that are matched to general rocks and minerals and present alkalinity like the portland cement. However, it is utilized only in the low value-added products, such as landfill and road construction, due to the volume expansion caused by f-CaO and f-MgO. Recently, researches on the practical application of electric arc furnace oxidizing slag for structural members have been in process. The purpose of this study is to estimate the flexural capacity of reinforced concrete (RC) beams with electric arc furnace oxidizing slag aggregates. All of four RC beams with various types of aggregates was cast, instrumented, and tested, and their flexural behavior was investigated. As a result of test, the RC beams with electric arc furnace oxidizing slag aggregates present adequate flexural capacity more than those having natural aggregates.