• Title/Summary/Keyword: high strength concrete column

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Behavior of Steel Beam-High Strength Concrete Column Joint Subjected to Cyclic Loadings (철골보-고강도 콘크리트 기둥 접합부의 거동에 관한 연구)

  • Shin, Sung-Woo;Lee, Kwang-Soo;Seo, Seon-Min
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.4 no.3
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    • pp.205-210
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    • 2000
  • The objective of this study is to investigate the structural behavior of steel beam-high strength concrete column joints subjected to reversed cyclic loadings. The variables of the experimental study is amount of steel plates at the beam-to-column joint panel zone. Three specimens were prepared and tested under constant uniaxial load($0.2f_{ck}A_g$) to reinforced high strength concrete column, and the reversed cyclic loads were applied to end of steel beams, The failure modes, hysteresis loop, stiffness degradations and energy dissipation capacities were analyzed and compared for test variables.

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Failure characteristics of columns intersected by slabs with different compressive strengths

  • Choi, Seung-Ho;Hwang, Jin-Ha;Han, Sun-Jin;Kang, Hyun;Lee, Jae-Yeon;Kim, Kang Su
    • Structural Engineering and Mechanics
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    • v.74 no.3
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    • pp.435-443
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    • 2020
  • The objective of this study was to determine the effective compressive strength of a column-slab connection with different compressive strengths between the column and slab concrete. A total of eight column specimens were fabricated, among which four specimens were restrained by slabs while the others did not have any slab, and the test results were compared with current design codes. According to ACI 318, the compressive strength of a column can be used as the effective compressive strength of the column-slab connection in design when the strength ratio of column concrete to slab concrete is less than 1.4. Even in this case, however, this study showed that the effective compressive strength decreased. The specimen with its slab-column connection zone reinforced by steel fibers showed an increased effective compressive strength compared to that of the specimen without the reinforcement, and the interior column specimens restrained with slabs reached the compressive strength of the column.

Hysteretic Behavior of RC Beam-Column Joint for High Strength Structures using Belite Cement (베라이트 시멘트를 이용한 고강도 철근콘크리트 보-기둥 접합부의 이력특성)

  • 배흥한;이상원;윤정배;김기수;이세웅
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10a
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    • pp.582-588
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    • 1998
  • The experimental study for the interior beam-column joint for high strength conccrete using Belite cement is presented. Test parameters are compressive strength, flexual strength ratio and joint shear stresslevel. The results from cyclic loading tests show different behaviors from the various parameters. Also, The different behaviors on beam-column joint can be achived by the different concrete strength.

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Experiments on Second -Order Behavior of High Strength Concrete Columns (고강도 콘크리트 기둥의 2계 거동에 관한 실험적 연구)

  • 김진근;양주경
    • Proceedings of the Korea Concrete Institute Conference
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    • 1992.10a
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    • pp.167-172
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    • 1992
  • To analyze the effects compressive strength of concrete and longitudinal steel ratio on second-order moment of columns, 30tied rein reinforced concrete columns with hinged ends were tested. The 80mm square cross section was used and the amount of eccentricity was 24mm. The compressive strengths of column specimens with slenderness ratios of 10, 60, and 100were 250, 648 and 880kg/$\textrm{cm}^2$, and the longitudinal steel ratios were 1.98%(4-D6) and 3.95%(8-D6). The ratio of ultimate load capacity to that of short column with the same eccentricity (Pu/Pn) was much decreased at high slenderness ratio with increasing the compressive strength of concrete. And the lateral displacement of slender column at the ultimate load was decreased as the strength was increased. These are due to that at high slenderness ratio the load capacity and behavior of column are affected by flexural rigidity. And, it was also found that with increasing steel ratio, the value of Pu/Pn and the lateral displacement at the ultimate load were larger for the same slenderness ratio.

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A Study on High Strength Concrete of Concrete Filled Steel Tube Column (CFT 기둥용 초고강도 충전콘크리트에 관한 연구)

  • Jung, Keun-Ho;Lim, Nam-Gi;Lee, Young-Do
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.1
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    • pp.127-132
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    • 2004
  • CFT(Concrete Filled Steel Tube) is a structure of circular or squared of steel column filled with concrete. The steel tube holds the concrete inside and that makes this structure to perform superior features on stiffness, proof stress, transformation, fire resistance and construction itself. In this study, by over the 800kgf/$\textrm{cm}^2$ of high strength concrete for CFT column, research has been done on the basic property of matter such as fluidity, resistance on segregation, compressive strength, setting icons of the concrete filled in the steel tube under conditions of standard weather. Physical properties of concrete for CFT that Concrete with silica fume, fly ash of air entraining and high-range water reducing agent, that used to CFT column research purpose to find the most ideal composition, which is achieved by the investigation in the concrete's property of matter like ability of Slump, Slump Flow, Air content, Bleeding, and Settlement. For this study, experiments which are bused on obtained the result through physical test are practiced, with all of the experiment, specimens only for control are produced in each method of curing and analyzed to relations with core strength in mock-up test. In mock-up test, the research is studied compactability of concrete filled in tube and degree of hydration hysteresis, as a basic reference for applying to field of CFT column which is used over 800kgf/$\textrm{cm}^2$ high strength concrete.

Ducitility Estimation of Exterior Beam-Column Joints using High-Strength Concrete (고강도 철근 콘크리트 보-기둥 접합부의 연성평가)

  • 장극관;서대원;황정현
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.415-418
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    • 1999
  • This paper presents a study in the ductility of reinforced concrete beam-column-slab joints Three assemblies were designed 2/3 scale (f'c=240kg/$\textrm{cm}^2$, f'c=700kg/$\textrm{cm}^2$) and tested to investigate seismic behavior. From the test results, 1) flexural cracks emerge to inside of beam deeply for high strength concrete member, 2) the high-strength specimens degraded in stiffness and strength, and unstable hysteretic behaviors were observed, owing to the brittleness of high-strength concrete beyond its range. 3) The confinement provided by the additional hoops to the column bar is probably the main reason for this improvement in behavior.

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Evaluation of Fire Performance for High Strength Concrete Mock-up Column with Fiber by Unloaded Fire Test (비재하 내화시험에 의한 섬유혼입 고강도 콘크리트 Mock-up 기둥의 내화성능 평가)

  • Song, Young-Chan;Kim, Yong-Ro;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.11a
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    • pp.97-100
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    • 2009
  • Fire resistance properties and mechanical properties of high strength concrete mock-up column using organic fiber by KS F 2257 Methods of fire resistance test for elements of building construction and compression test was investigated for application of precast concrete column method of high rise building in this study. As a test result, it was appeared that ECC permanent form is available as fire resistance method of high strength concrete and new precast concrete construction method for facilitating construction of high rise building.

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Seismic Response of Exterior Beam-Column-Slab connection using High-Strength Materials (고강도 재료를 사용한 외부 보-기둥-슬래브 접합부의 지진응답)

  • 장극관
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 1999.10a
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    • pp.343-350
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    • 1999
  • The purpose of this study is to compare the response of the high-strength concrete beam-column-slab subassembly with the response of a normal-strength concrete specimens. Four assemblies were designed 2/3 scale beam-column-slab joint(fc'=240kg/cm2 fc'=700kg/cm2) and tested to investigate seismic behaviour. From the test results 1) flexral cracks emerge to inside of bean deeply for high strength concrete member 2) the high-strength specimens represented stable hysteretic behaviour for the displacement ductility 5.5 but degradation in stiffness and strength and unstable hysteretic behaviors were observed owing to the brittleness of high-strength concrete beyond its range.

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Flexural Test on Beam-Column Connections Using High Strength Concrete and GFRP bars (고강도 콘크리트와 GFRP 보강근을 사용한 보-기둥 접합부 휨 실험)

  • Lee, Hye-Jin;Kim, Si-Jun;Yang, Keun-Hyeok;Park, Sang-Hun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.177-178
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    • 2017
  • The beam-column connection using high-strength GFRP bars exhibited a comparable flexural strength but brittle failure mode, when compared with those of connection using high-strength steel reinforcement.

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Transmissibility of High-Strength Concrete Column Loads through Normal-Strength Concrete Slabs (일반 강도 콘크리트 슬래브를 통한 고강도 콘크리트 기둥의 축력 전달)

  • 윤영수;데니스미첼
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.521-524
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    • 1999
  • Twelve column specimens were tested in compression, six were slab-column specimens and six were isolated column specimens. The slab column specimens were first tested to punching shear failure before the columns of the specimens were loaded axially. The effects of confinement from the surrounding slab on the axial capacity of the columns was investigated. Other parameters investigated were the placement of fiber-reinforced concrete in the slab and the concentration of flexural reinforcement in the column vicinity.

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