• Title/Summary/Keyword: 보-기둥접합부

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The Effects of Bent-up Bar on High Strength Reinforced Concrete Beam-Colum Joint Subjected to Cyclic Loads (반복하중을 받는 고강도 철근콘크리트 보-기둥 접합부의 구부림철근 효과에 관한 연구)

  • 신성우;이광수;오정근;권영호
    • Proceedings of the Korea Concrete Institute Conference
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    • 1990.04a
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    • pp.61-65
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    • 1990
  • The purpose of this study was to investigate the effect of Bent-up Bars in Beam-Column Joint with High-Strength Concrete up to 800 kg/$\textrm{cm}^2$. 5 specimens were tested under reversed cyclic loadings. The primary variables were the number of the Bented Bars with Joint Core, compressive strength and loading patterrns. The results showed that bent-up bars in beam-column joint prevented crack from extending into core but the failure was concreterated at the face of beam-column joint. Thus shear stress constant value(Г) should be revised for High Strength Concrete Beam-Column Joint with Bent-up Bars.

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Finite Element Analysis of Exterior R.C. Beam-Column Joints Containing Headed Bars utilized for Enhanced Seismic Performance (Headed bar를 사용한 외부 철근 콘크리트 보-기둥 접합부의 강화된 내진 성능에 대한 유한요소해석)

  • Bang, Suk;Lee, Joo-Ha;Yoon, Young-Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.506-509
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    • 2004
  • This paper proposes Headed bar as reinforcement of beam-column joint, and proves seismic performance and reduction of reinforcement congestion. In these case, the use of Headed bars have obvious advantages. The greatest benefit of using Headed bars is not only improved structural performance of beam-column joints, but also the ease of fabrication, construction, and placement. Three-dimensional finite element analysis model is compared with test program which was fulfilled by the proposed model with Headed bar. Also, the plastic hinge region is relocated to the center of the longitudinal beam length according to the strong column-weak beam design philosophy, so Headed bar is used as the joint reinforcement. Therefore, this paper presents results of a computer analysis of a practical solution for relocating potential beam plastic hinge regions by the placing of straight - Headed bar.

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Analytical Evaluation of Beam-Bar Bond and Anchorage in Beam-column joints under Cyclic Loading (주기하중을 받는 보-기둥 접합부내 보주철근 부착 및 정착의 해석적 평가)

  • Oh Soo-Yeun;Lee Joo-Ha;Yoon Young-Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.510-513
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    • 2004
  • The objectives of this research are to evaluate the effect of the compressive strength of concrete, reinforcing bar size, spacing of column transverse bars related to the concrete confinement effects on anchorage bond strength and bond behavior of beam-column joints subjected to cyclic loading and to predict the bond behavior of beam-column joints according to the variables by Finite Element Analysis appling the interface element between concrete and reinforced bar surface in a three-dimensional configuration. This paper shows that to verify the results by three-dimensional nonlinear finite element analysis appling a interface element, the test results that were already conducted are compared with analytic results. The behavior of bond and anchorage of beam bar is expressed by a local bond stress-slip relationship and the failure mode of bond is predicted by principal stress contour.

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Performance Evaluation of Inelastic Rotation Capacity of Special Moment Frame Connections (보-기둥 접합부를 가진 철근 콘크리트 모멘트 골조의 비탄성 회전 능력에 대한 평가)

  • Lee, Ki-Hak
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.688-691
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    • 2004
  • This study summarizes results of a research project aimed at investigating the inelastic rotation capacity of beam-column joints of reinforced concrete moment frames. A total of 28 specimens were classified as special moment frame connections based on the design and detailing requirements in the ACI 318-99 provisions. Then, the acceptance criteria, originally defined for steel moment frame connections in the AISC-97 Seismic Provisions, were used to evaluate the joint connections of concrete moment frames. Twenty seven out of 28 test specimens that satisfy the design requirements for special moment frame structures provided sufficient strength and are ductile up to a plastic rotation of $3\%$ without any major degradation in strength.

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Experimental Study on the Structural Behavior of Concrete-Filled Circular Tubular Column to H-Beam connections without Diaphragm (다이아프램이 없는 콘크리트 충전 원형강관 기둥-H형강 보 접합부의 구조적 거동에 관한 실험적 연구)

  • Kang, Hyun Sik;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.9 no.1 s.30
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    • pp.13-22
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    • 1997
  • This paper is concerned with an experimental study on structural behavior of Concrete-Filled Circular Tubular(CFCT) column to H-beam connections. The important parameters are the number of inner reinforced rib and the width of H-beam flange(100, 150, 200mm) with variable column thickness(5.8mm, 9.2mm, 12.5mm) around the joint between CFCT and H-beam. Test results are summarized for the displacement, strength, initial stiffness, failure mode and energy absorption capacity of each specimen. The purpose of this paper is to investigate the initial stiffness and the strength of connections to evaluate the structural behavior of the CFCT column to H-beam connections. From the discussion about the test results, the basic data for non diaphragm connection design would be suggested.

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Analytical Modeling Method of Beam-Column Joints for the Inelastic Analysis of R/C Structures (철근콘크리트 구조물의 비탄성해석을 위한 보-기둥 접합부의 해석모델링 기법)

  • 장극관;황정현;양승호
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2001.04a
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    • pp.287-295
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    • 2001
  • The purpose of this paper to describe an analytical model that is capable of reproducing the hysteretic behavior of beam-column joints under cyclic loading and to suggest the variable of hysteretic model for the inelastic analysis of R/C frame structures to do this quasi-static analysis using IDARC program was performed for the beam-column joints. The effort to obtain the result of analysis similar to those of experiment was made by determining the value for hysteretic parameters representing stiffness degradation, strength deterioration and pinching effect. The accuracy and reliability of the proposed analytical model was demonstrated by comparison of load-displacement relation, maximum strength, stiffness degradation and energy dissipation.

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Welding and Moment Resisting Performance of R/C Column-Steel Girder Connection (철근콘크리트 기둥-철골 보 접합부의 용접성능 및 휨 저항성능)

  • 전재범;최광호;이세웅;김상식
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.553-558
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    • 1999
  • As a process of development of composite beam-column connection system, structural tests have been conducted to verify moment resisting performance of the system. The tests have been proceeded by two steps, the first being welding performance test of the steel connection rod and stiffners, and the second overall moment resisting capacity of the fuly assembled system. Ten welding test specimens and four prototype specimens have been used in the test. Good structural performance of welding test specimens has been observed without any single welding failure, and sufficient moment resisting capacity has been proved from the overall performance test, with the moment magnitude in excess of the calculated plastic moment.

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Analysis on the Behavior of Modified DDC, Precast Beam-Column Concrete Connectors for Apartments (공동주택을 위한 건식 프리캐스트 보-기둥 변형 DDC 접합부의 거동분석)

  • Song, Hyung-Soo;Lee, Bo-Kyung;Yu, Sung-Yong
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.9-12
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    • 2005
  • Four precast concrete beam-column connectors for the apartment buildings were considered to develop a modified model which was adapt to domestic construction conditions from the DDC(Dywidag Ductile Connectors) of Germany. Special H-shape steel were used to decrease the width of column and beams for the construction of external frames of apartments. It was found that the DDC had high joint strength and ductility, however failed in x-shape crackings in the columns. The modified one showed better behaviors in tests because they did not show critical column crackings at failure. The test result of modified one with grouting were compared to that of the one without grouting within the duct. The one with grouting showed higher strength and ductility in failure than that without grouting.

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Analysis on the Behavior of Post-tensioned Precast Beam-Column Concrete Connectors (포스트텐션 프리캐스트 보-기둥 건식 콘크리트 접합부의 거동분석)

  • Song Hyung Soo;Ryu Jung Wook;Kim Yun Soo;Yu Sung Yong
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.41-44
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    • 2005
  • Three precast concrete beam-column connectors for the high-rise office buildings were considered to investigate the prestressing effects of the DDC(Dywidag Ductile Connectors) of Germany and of the modified DDC. The specimens of DDC, DDC with post-tensioning and modified DDC with post-tensioning were constructed and tested to verify the safety. The DDC with and without post-tensioning showed reliable joint strength and ductility but failed in critical x-shape crackings at the column. The modified one showed better behaviors in tests because they did not show critical column crackings at failure. The use of prestressing did not helpful significantly to increase the strength and ductility of connectors but helpful only to develop self-centering behavior for stability.

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Experimental evolution of RC beam-column joints strengthened with CFRP (CFRP로 보강된 비내진 철근콘크리트 보-기둥 접합부의 내진성능 실험)

  • Kim, Min;Lee, Ki-Hak;Lee, Jae-Hong;Woo, Sung-Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05a
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    • pp.106-109
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    • 2006
  • It has been shown that many reinforced concrete(RC) structures designed without seismic details have experienced brittle shear failures in the beam-column joint area and may result in large permanent deformations and structural collapse. In this study, experimental investigations for RC beam-column joints strengthened with the carbon fiber-reinforced polymer(CFRP) under cyclic loadings were presented. The use of CFRP in the joint was varied to determine the effective way of improving the structural performances of RC joints. Ten RC beam-column joints were designed and tested with cyclic loadings. The experimental results showed that the use of CFRP in RC joints would be very effective solutions to improve the seismic performances of the non-seismic RC joints. All of the non-seismic design specimens strengthened with CFRP sheets showed the significant increase of strength and ductility.

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