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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.
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) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 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.
구속상세를 가진 헤드 철근의 겹침이음 성능에 관한 실험적 연구
이용택 ( Lee Yong Taeg ),채서호 ( Chea Seo Ho ),김승훈 ( Kim Seung Hun ),황홍순 ( Hwang Hong Soon ),박천권 ( Park Chon Kyon ),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. Previous Michael's experimental research showed that confinement details had an effect on the lap splice performances of headed bars. In this study, the lap splice performances of headed bars with confinement details are evaluated through the experimental works. Six specimens, of which variables were the lap length of headed bar and the type of confine details, were tested for the performance evaluation on lap splice. Test results show that the confinement reinforcement improve the performance of lap splice.
구속상세를 가진 헤드 철근의 겹침이음 성능에 관한 실험적 연구
이용택(Lee Yong Taeg),채서호(Chea Seo Ho),김승훈(Kim Seung Hun),황홍순(Hwang Hong Soon),박천권(Park Chon Kyon),반병열(Bahn Byong Youl) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 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. Previous Michael"s experimental research showed that confinement details had an effect on the lap splice performances of headed bars. In this study, the lap splice performances of headed bars with confinement details are evaluated through the experimental works. Six specimens, of which variables were the lap length of headed bar and the type of confine details, were tested for the performance evaluation on lap splice. Test results show that the confinement reinforcement improve the performance of lap splice.
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.
유효 깊이가 상이한 헤드철근간의 비접촉 겹침이음에 대한 실험적 연구
김승훈(Kim Seung-Hun),이용택(Lee Yong-Taeg),김태수(Kim Tae-Soo),채서호(Chea Seo-Ho) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.5
Headed bars have been 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. New moment-resisting precast concrete beam-column joint was proposed for moderate seismic regions. It has the connection headed reinforcing bars, penetrated the joint. The connection headed reinforcing bars and the bottom headed bars of precast beam are in noncontact lap splices with different effective depths. In this research, a test program was conducted to evaluate the lap splice performance of the noncontact headed reinforcements with different effective depths. Five lap splice specimens were tested. Their variable was the lap length(6~14 times the diameter of D25 bar). Test results showed that the specimen, which had the lap length as fourteen times the diameter of reinforcement, had the nominal tensile strength of reinforcement. Specimens which had the lap length less than twelve times the diameter of reinforcement failed with the slip of reinforcements and the vertical crack in the lap zone. The ratios of the test maximum strength and the maximum strength by CCD method were 7.10∼13.37. 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, and by consideration of only the bearing stress of heads except the bond stress of reinforcements. The ratios of the test maximum strength and the maximum strength assumed by ACI 318-08 for headed deformed bars were 1.70∼2.17. To develop a reliable design guideline of the lap strength of headed reinforcements, it needs to consider the effect of transerse reinforcement, material strengths, edge distance, and spacing of head bars.