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평판두께와 연단거리를 변수로 갖는 박판탄소강 볼트접합부의 종국거동에 관한 실험적 연구
이용택,김태수,정하영,김승훈,Lee, Yong Taeg,Kim, Tae Soo,Jeong, Ha Young,Kim, Seung Hun 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.5
본 연구의 목적은 박판 탄소강 일면전단 2행 2열 볼트접합부의 블록전단파단거동과 면외변형의 영향을 조사하는 것이다. 하중직각 방향 연단거리, 볼트직경, 피치, 게이지 치수를 고정하고 블록전단파단이 발생하도록 실험체를 계획한다. 접합평판의 두께, 하중방향연단거리를 주요변수로 설정한다. 단순인장 실험을 실시하고 블록전단파단 양상, 최대내력을 현행의 설계기준식에 의한 예측치와 비교한다. 또한, 판 두께와 연단거리에 따른 하중방향과 직각방향으로 발생하는 면외변형의 발생조건을 조사하고 면외변형의 발생으로 인한 내력저하정도를 고찰한다. The purpose of this experimental study was to investigate the block shear fracture behavior and curling effect on a single shear-bolted connection in thin-walled carbon steel fabricated with four bolts. The specimens that fail by block shear were planned to have a constant dimension of the edge distance perpendicular to the loading direction, bolt diameter, pitch, and gage. The main variables of the specimens were plate thickness and end distance parallel to the loading direction. A monotonic tensile test was carried out for the bolted connections, and the ultimate behaviors, such as the fracture shape, ultimate strength, and curling, were compared with those that had been predicted using the current design specifications. The conditions of curling occurrence in terms of plate thickness and end distance were also investigated, and the strength reduction due to curling was considered.
헤드 철근의 구속상세에 따른 겹침이음성능에 관한 실험적 연구
이용택(Lee Yong-Taeg) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.5
Headed bars have used to the anchoring of the tension or compression longitudinal bars and of the shear reinforcing bars. Recently, lap splices of headed steel reinforcements are attempted to the joints of precast concrete members and to the connections between old and new concrete members. Previous experimental and analytical researches for the lap splice of headed bars hadn't be studied except Michael's 2003. In this study, the lap splice performances of headed bars with confinement details are evaluated through the experimental works. Twelve lap splice specimens were tested. Wide beam specimens were fabricated with a lap splice at mid-span. They were loaded in flexure, placing the lap splice in tension. The variables in this study were: lap length(10 and 14 times the diameter of reinforcement), lapped reinforcements spacing (in contact or not), and confinement type (no confinement, transverse bars, transverse bars and hairpin confinement in lap zone). Specimens were instrumented to measure the load on the specimen, strain along the reinforcements with in the lap zone, and mid-span deflection. The cracking behavior was also observed and recorded. The following conclusions were drawn from the test results in this study; 1) The initial crack of the specimens lapped developed at the heads of reinforcements. The specimens failed by the crack with the struts acting between the opposing heads of lapped reinforcements. 2) Transverse bars and closed tie-down bars provide the effective confinement for lapped reinforcements, especially in the noncontact reinforcements. To improve the workability and the lap splice strength, it is effective that the headed reinforcements with the confinement reinforcements are placed in out of contact. 3) CCD method evaluated the maximum strength as 2.71∼5.26 times the test maximum strength. It was caused by the reduction of lap length where headed reinforcements were located less than 1.5 times lap length from three or more edges. For evaluation of the lap strength of headed reinforcements, it needs to consider the bearing stress of heads, the bond stress of reinforcements, and the confining effects.
접촉 및 비접촉된 헤드 철근의 겹침이음 성능에 관한 실험적 연구
이용택 ( Lee Yong Taeg ),채서호 ( Chea Seo Ho ),김승훈 ( Kim Seung Hun ),이문표 ( Lee Moon Pyo ),이유복 ( Lee Yoo Bok ),반병열 ( Bahn Byong Youl ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
Headed bars have used to the anchoring of the tension or compression longitudinal bars and of the shear reinforcing bars. Recently, lap splices of headed bars are attempted to the joints of precast concrete members and to the connections between old and new concrete members. It is desirable that the headed ends protruding from two adjoining precast segments be offset from one another as much as possible so that overlapping is avoided and placement. In this study, the lap splice performances of contact and non-contact headed bars are evaluated through the experimental works. Six specimens, of which variables were the spacing of lapped bars and the type of confine details. Test results show that the confine details change the lap splice performance of contact and non-contact headed bars.
이용택(Lee Yong-Taeg),김승훈(Kim Seung-Hun),채서호(Chea Seo-Ho),반병열(Bahn Byong-Youl) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3
Headed bars have used to the anchoring of the tension or compression longitudinal bars and of the shear reinforcing bars. Recently, lap splices of headed steel reinforcements have been attempted to the joints of precast concrete members and to the connections between old and new concrete members. Previous experimental and analytical researches for the lap splice of headed bars hadn't be studied except Michael's 2003. In this research, the experimental works were conducted to study the lap strength of the headed reinforcements placed in a horizontal single layer. Ten lap splice specimens were tested. Wide beam specimens were fabricated with a lap splice at mid-span. They were loaded in flexure, placing the lap splice in tension. The variables in this study were: lap length(6∼16 times the diameter of reinforcement), diameter of reinforcement(D19, D25), and debonded versus bonded bars. Specimens were instrumented to measure the load on the specimen, strain along the reinforcements with in the lap zone, and mid-span deflection. The cracking behavior was also observed and recorded. The following conclusions were drawn from the test results in this study; 1) The initial crack of the specimens lapped developed at the heads of reinforcements. The specimens failed by the crack with the struts acting between the opposing heads of lapped reinforcements. 2) Bond contribution to increase strength and deformation was great. In accordance with the this result, it is necessary to consider the bond strength for the lap length design of headed reinforcements. 3) CCD method evaluated the maximum strength as 2.21∼4.96 times the test maximum strength. It was caused by the reduction of lap length where headed reinforcements were located less than 1.5 times lap length from three or more edges. For design guideline of the lap strength of headed reinforcements, it needs to consider the bearing stress of heads and the bond stress of reinforcements.