• Title/Summary/Keyword: 횡보강

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Effects of Transverse Reinforcement on Flexural Strength and Ductility of High-Strength Concrete Columns (횡보강근에 따른 고강도 콘크리트 기둥의 휨강도와 연성)

  • 황선경;윤현도;정수영
    • Journal of the Korea Concrete Institute
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    • v.14 no.3
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    • pp.365-372
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    • 2002
  • This experimental investigation was conducted to examine the behavior of eight a third scale columns made of high-strength concrete(HSC). The columns were subjected to constant axial load corresponding to target value of 30 percent of the column axial load capacity and a cyclic horizontal load-inducing reversed bending moment. The variables studied in this research are the volumetric ratio of transverse reinforcement(Ps=1.58, 2.25 %), tie configuration(hoop-type, cross-type, diagonal-type) and tie yield strength(fy=5,600, 7,950 kgf/$\textrm{cm}^2$). Test results indicated that the flexural strength of all the columns did not exceed calculated flexural capacities based on the equivalent concrete stress block used in current design code. Columns with 42 percent higher amounts of transverse reinforcement than that required by seismic provisions of ACI 318-99 were shown ductile behavior. With axial load of 30 percent of the axial load capacity, the use of high-strength steel as transverse reinforcement may lead to equal or higher ductility than would be achieved with low-strength steel.

Moment-Curvature Relationship of RC Structural Walls with Confined Boundary Elements Using Pre-Fabricated Rectangular Continuous Hoops (사각 연속횡보강 선조립철근으로 단부횡보강된 RC 구조벽체의 모멘트-곡률 관계)

  • Kim, Hui-Do;Lee, Seung-Hyun;Cho, Jae-Hui;Kim, Sung-Hyun;Kang, Su-Min
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.35 no.1
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    • pp.45-55
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    • 2022
  • Because boundary confinement details proposed in the current design standards are significantly inferior in workability and production quality, it is necessary to develop boundary confinement details of RC structural walls that are capable of ensuring seismic performance and workability. With the recent development of the wire rod manufacturing technology, various pre-fabricated continuous hoop details can be manufactured. In this study, an analysis was conducted on the moment-curvature relationship of RC structural walls to which the pre-fabricated continuous hoop details were applied. According to the nonlinear cross-section analysis, the RC structure wall to which the details of the pre-fabricated continuous hoop details are applied can ensure seismic performance as the area of the pre-fabricated continuous hoop increases. Based on these research results, when applying the pre-fabricated continuous hoop in detail, it is necessary to secure the area of the pre-fabricated continuous hoop as much as the area of the existing boundary confinement.

Design of Boundary Confinement of Structural Walls (구조벽의 단부 횡보강 설계)

  • Kang, Su-Min;Park, Hong-Gun
    • Journal of the Korea Concrete Institute
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    • v.15 no.6
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    • pp.877-887
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    • 2003
  • For a performance-based design of structural walls, it is necessary to develop a rational design method for determining the length and detail of boundary confinement so as to satisfy the given ductility demand. In the present study, the curvature capacity of a structural wall with boundary confinement was estimated considering the effects of various design parameters. The curvature demand of the plastic hinge corresponding to the given design displacement was also determined. By equalizing the curvature capacity to the demand, a design method for determining the length of boundary confinement, was developed. According to the design method, the length of boundary confinement increases as axial compressive load and design displacement increase, and as concrete strength, wall thickness, amount of lateral reinforcement and aspect ratio decrease. A study was performed on details for effective lateral confinement of walls with rectangular cross-section. Based on the findings, design guidelines on spacings of ties and cross-ties were proposed.

Confined Effect of Concrete Compressive Members Strengthened with Carbon Fiber Laminate (탄소섬유판으로 횡보강된 콘크리트 압축부재의 보강성능)

  • Chung, Lan;Lee, Hee-Kyoung;Kim, Sung-Chul;Yoo, Seong-Hoon;Kim, Joong-Koo
    • Magazine of the Korea Concrete Institute
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    • v.10 no.6
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    • pp.345-352
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    • 1998
  • Compressive strength of concrete compression members strengthend with carbon fiber laminate(CFL) were studied from the test results. Test parameters are spacing, thickness, width, ply and spliced length of carbon fiber laminates. Specimens strength with sheets failed with sudden tensile rupture of the laminate, which indicate very brittle failure mode. Test result shows that closer spacing and to increas thickness of CFL is more effective. But strengthening ratio with 1-ply CFL is more effective than that of specimen with 2-ply CFL. Compressive strength capacity of specimen splied 24cm shows almost similar strength to that of non-spliced specimen. The ultimate load carrying of specimen strengthened with CFL ranges 1.11~1.86 times of that of non-strengthened specimen.

Ductility Confinement of RC Rectangular Shear Wall (장방형 철근 콘크리트 전단벽의 연성 보강)

  • 강수민;박홍근
    • Journal of the Korea Concrete Institute
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    • v.14 no.4
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    • pp.530-539
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    • 2002
  • In designing the boundary confinement of shear walls, the current design provisions and recommendations are empirical and prescriptive; they specify a certain confinement length and details, regardless of the actual requirement of ductility Therefore, they are inappropriate to the performance based-design. The purpose of the present study is to develop a ductility design method that Is applicable to the performance based-design of shear wall. For the purpose, experimental studies were performed to investigate variations in the ductility of shear walls with the length of the boundary confinement. Five specimens modeling the compressive zone of cross sections with different confinement area were tested against eccentric vertical load. Through the experimental studies, strength, ductility, and failure mode of the compression zone were investigated. In addition, nonlinear numerical analyses for the overall cross-sections of shear wall were performed to investigate variations of the stress and strain profiles with the length of compression zone. On the basis of the experimental and numerical studies, a ductility design method for shear wall was developed. By using the proposed design method, for a given ductility demand, the area of lateral confinement and corresponding reinforcement ratio can be precisely determined so that the ductile behavior and economical design are assured.

Moment-Curvature Relationship of Structural Wells with Confined Boundary Element (단부 횡보강된 구조벽의 모멘트-곡률 관계)

  • Kang, Su-Min;Park, Hong-Gun
    • Journal of the Korea Concrete Institute
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    • v.15 no.2
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    • pp.323-334
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    • 2003
  • For performance-based design using nonlinear static analysis, it is required to predict the inelastic behavior of structural members accurately. In the present study, a nonlinear numerical analysis was peformed to develop the method describing the moment-curvature relationship of structural wall with boundary confinement. Through the numerical analysis, variations of behavioral characteristics and failure mechanism with the arrangement of vertical reinforcement and the length of boundary confinement were studied. According to the analysis, the maximum moment-carrying capacity of structural walls with adequately confined boundary elements is developed at the moment the unconfined concrete reaches the ultimate compressive strain. Walls with flexural re-bars concentrated on the boundaries fails in a brittle manner. As vortical re-bars in the web increases, the brittle failure is prevented and a ductile failure occurs. Based on the findings, moment-curvature curves for walls with a variety of re-bar arrangement were developed. According to the proposed relationships, deformability of the structural walls wth boundary confinement increases as the compressive strength of the confined concrete increases compared to the applied compressive force.

Effects of Haunch Reinforced Steel Moment Connection on Elastic Lateral Drift (헌치로 보강된 철골 모멘트 접합부의 탄성 횡변위에 대한 영향)

  • Lee, Cheol Ho
    • Journal of Korean Society of Steel Construction
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    • v.9 no.1 s.30
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    • pp.149-157
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    • 1997
  • 철골 모멘트 접합부를 헌치로서 보강할 경우 내진거동이 크게 증진됨이 최근의 실물대 시험에서 입증되고 있다. 본 연구에서는 헌치로서 보강된 철골 모멘트 접합부가 골조의 탄성 횡변위 거동에 미치는 영향을 해석적으로 평가하는 방안을 제시하였다. 즉 내부의 보-기둥 부분골조를 대상으로 기둥, 보 및 이중패널존에서 기인하는 탄성 횡변위 성분을 해석적으로 유도하였다. 핵심이 되는 내용은 헌치 보강시 생성되는 이중패널존의 전단변형을 고려하는 것이었다. 제시된 방안에 의한 예측치는 3차원 유한요소해석에 의한 결과와 잘 부합하였다. 본 연구에서 수행한 사례연구에 의할 때 헌치의 도입으로 패널존의 강성증대가 가장 현저하여서 패널존의 전단변형에서 기인하는 탄성 횡변위가 50%정도 감소되었다. 본 연구의 결과는 아직 잘 알려지지 않은 헌치 보강에 따른 부차효과(side effects)의 이해에 도움이 될 수 있을 것이다.

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Behavior and Capacity of Compression Lap Splice in Confined Concrete with Compressive Strength of 40 and 60 MPa (횡보강근이 있는 40, 60 MPa 콘크리트에서 철근 압축이음의 거동과 강도)

  • Chun, Sung-Chul;Lee, Sung-Ho;Oh, Bo-Hwan
    • Journal of the Korea Concrete Institute
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    • v.21 no.4
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    • pp.389-400
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    • 2009
  • A compression lap splice can be calculated longer than a tension lap splice in high strength concrete according to current design codes. Including effects of transverse reinforcement, a compression splice becomes much longer than a tension splice. Effects of transverse reinforcement and bar size on strength and behavior of compression lap splice, which always exist in actual structures, have been investigated through experimental study of column tests with concrete strength of 40 and 60 MPa. The results of the tests with bar diameters of 22 and 29 mm show that there is no size effect of bar diameter on compression lap splice. Bond strength of small bar diameter may increase. However, large diameters of re-bars are used in compression member and the size effect of re-bars does not have to be considered in compression lap splice. Confined specimens have twice of calculated strengths by current design codes. New design equations for the compression lap splice including the effects of transverse reinforcement are required for practical purpose of ultra-high strength concrete. End bearing is enhanced by transverse reinforcement placed at ends of splice not by transverse reinforcement within splice length. As more transverse reinforcement are placed, the stresses developed by bond linearly increase. The transverse reinforcements at ends of splice a little improve the strength by bond. Because the stresses developed by bond in compression splice with transverse reinforcement are nearly identical to or less than those in tension splice with same transverse reinforcement, strength increment of compression splice is attributed to end bearing only.

A stress-strain Model of High-strength concrete confined with Transverse Reinforcement (횡보강철근으로 구속된 고강도 콘크리트의 응력-변형률 구속 모델)

  • Moon, Cho-Hwa;Park, Jong-Wook;Kim, Sang-Woo;Kim, Kil-Hee;Lee, Jung-Yoon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.87-88
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    • 2010
  • The strength and ductile capacity of reinforced concrete column can be improved by confinement using transverse reinforcement. Variety stress-strain models about the reinforced concrete confined by transverse reinforcement has been proposed. In this paper, parameters which effect to the ultimate confinement stress of circular cylinder confined by high strength transverse steel is examined. And the possion's ratio equation is proposed by analysis of strain between concrete and transverse reinforcement.

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An Experimental Study on the Structural Behavior of Concrete Columns Confined with Welded Reinforcement Grids (용접 띠철근 보강된 콘크리트 기둥의 역학적 거동에 관한 실험적 연구)

  • Choi, Chang-Sik;Saatcioglu, Murat
    • Magazine of the Korea Concrete Institute
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    • v.11 no.2
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    • pp.187-196
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    • 1999
  • An experimental investigation was conducted to study the structural behavior of concrete columns confined with welded grids. The full-scale columns with different volumetric ratio, spacing and arrangement of welded reinforcement grids were tested under simulated seismic loading. The columns were subjected to constant axial compression of approximately 20% or 40% of their capacities accompanied by incrementally increasing lateral deformation reversals. The results indicate that the welded reinforcement grid can be used effectively as confinement reinforcement provided that the steel used, have sufficient ductility and the welding process employed does not alter the strength and elongation characteristics of steel. The grids improved the structural performance of columns, which developed lateral drift ratios in excess of 3% with the spacing and volumetric ratio of transverse reinforcement similar to those required by the ACI 318-95 Building Code. Drift capacity further increased when grids with larger number of cells were used. Furthermore, the use of grids reduced congesting of reinforcement while the dimensional accuracy provided perfect support to longitudinal reinforcement.