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단일 ㄱ형강의 블록전단 파단 및 전단지체 현상 -고력볼트 3개 또는 4개로 접합된 단일 ㄱ형강-
이향하,심현주,이은택,Lee, Hyang Ha,Shim, Hyun Ju,Lee, Eun Taik 한국강구조학회 2004 한국강구조학회 논문집 Vol.16 No.5
본 연구는 볼트개수 3개 또는 4개로 접합된 인장력을 받는 ㄱ형강의 블록전단 파단시, 전단지체 효과를 분석하여 AISC의 블록전단식과 순단면파단식을 비교 검토하였다. 볼트 3개 또는 4개로 접합된 실험체의 경우 순단면 파단과 같은 블록전단, 순단면 형태의 파단으로 파단되었다. 실험결과는 블록전단에 영향을 미치는 접합길이, 실험체의 두께, 감소계수 등을 변수로 분석하였다. 실험결과에 따라, 블록전단내력 산정시 Kulak의 제안한 감소계수 U를 계산해서 적용하는 것이 필요한 것으로 판단된다. The purpose of this paper was to investigate the block shear and the fracture in the net section, according to AISC Specifications, by analysing the shear lag effect in the block shear rupture of the single angle with three or four bolt connection. Specimen with three or four bolt connections showed that failure generally went from block shear with some net section failures to classic net section failures. From the test results, showed that the connection length, the thickness of angle, and reduction factor, which affect the block shear rupture, were investigated. According to the test results, it is suggested that the calculation of the net section rupture capacity by using the reduction factor of U, that was suggested by Kulak, is needed.
단일 ㄱ형강의 블록전단 파단 및 전단지체현상 - 고력볼트 2개로 접합된 단일 ㄱ형강 -
이은택(Lee Eun-Taik),김진호(Kim Jin-Ho),박지영(Park Ji-Young),이향하(Lee Hyang-Ha) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.11
The purpose of this paper is to compare with the property of block shear design code according to the limit state design of steel structures and AISC Specifications by analysing the shear lag effect in the block shear rupture of the tension joints. From the results of this experimental program, the connection length, thickness of angle and reduction factor which affect the block shear rupture were investigated. According to the test results, it is suggested that the calculation of the block shear capacity by using the shear length due to the real rupture line and the reduction factor of U that was suggested by Epstein is needed. Also, in the single angle two bolt connection, the ratio of the width and connection length is small. In this case, reduction factor(0.75) is closer to the experimental values when reduction factor(Ue = 1 - (X/L)) is compared with U=0.75.
이은택,김만수,전봉진,이향하 중앙대학교 건설산업기술연구소 2003 건설산업기술연구소 논문집 Vol.4 No.-
The junction of tension materials, connected with high-strength bolt, should be designed to bear net section destruction, fastener fracture, and fracture of block shear considering yielding of the shear plane and the impact of shear retardation. Block shear among them means that tension side vertical and shear plane parallel to and shear plane horizontal in the direction of weight is torn in the form of "square piece;" it is a type of fracture well known in the junction such as simple beam or gasset plate connected with the bolts. In other words, block shear is a situation of limitations where member resistance is determined by shear strength generated by the destruct line (DL) and tension strength generated by right-angled sections. Since the design law of limitation status of steel architecture was established in 1997, investigation into detailed block shear calculation formula is not thoroughgoing enough, and it is not put into practice very well. This study showed that fracture shape and the proof stress of the fracture of 'ㄱ' steel (angle) are emphasized based on the previous results in order to find out feasibility of design criteria of nlock shear in terms of design law of limitation status and verify calculation formula of block shear.