• Title/Summary/Keyword: 전단 보강

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Experimental Study on Shear Strength of AFRP-Reinforced Concrete Deep Beam (AFRP 보강근 콘크리트 깊은보의 전단강도에 대한 실험적 연구)

  • Cho, Jang-Se;Lee, Young-Hak;Kim, Hee-Cheul
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.445-448
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    • 2010
  • 본 연구는 섬유 보강 폴리머(Fiber Reinforced Polymers, 이하 FRP) bar로 보강된 콘크리트 깊은 보의 전단강도를 평가하기 위하여 전단경간비, 보강비, 주근의 종류를 변수로 총 6개의 실험체에 대한 전단 실험을 수행하였다. 전단실험을 토대로 FRP bar로 보강된 콘크리트 깊은보의 균열 및 처짐에 대한 거동 조사를 수행하였으며, ACI 318-08의 스트럿-타이 모델을 이용한 전단강도와 아치작용을 고려한 기존 제안식에 의한 전단강도를 비교 평가하였다. 그 결과, FRP bar로 보강한 실험체와 철근으로 보강한 실험체는 상이한 전단거동을 보였으며, FRP bar로 보강한 경우의 전단강도가 철근으로 보강한 경우보다 증가하는 것으로 나타났다. 전단강도 산정에 있어서는 ACI 318-08의 스트럿-타이 모델을 이용한 방법이 기존 제안식에 의한 방법보다 상대적으로 정확했다.

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A Study on the Shear Resisting Effect of Filling-up Carbon Fiber Rod Plastic in Reinforced Concrete Beam without Web Reinforcement (전단보강근이 없는 철근콘크리트보의 매립형 CFRP 전단보강효과에 대한 연구)

  • Kim, Young-Sik;Park, Sung-Moo
    • Journal of Korean Association for Spatial Structures
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    • v.5 no.2 s.16
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    • pp.57-63
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    • 2005
  • The reinforced concrete becomes deteriorated. In strengthening of reinforced concrete structure, it is recently useing FRP. The purpose of this study is to investigate the shear resisting effort of filling-up CFRP in reinforced concrete beams without web reinforced. Six specimens were manufactured and tested. In the test result, it was analysis. The main variables in the test were a space and volume of CFRP.

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A Study on the Shear Resisting Effect of Filling-up Carbon Fiber Rod Plastic in Reinforced Concrete Beams with web Reinforcement (전단보강근이 있는 철근콘크리트보의 매립형 CFRP 전단보강효과에 대한 연구)

  • Kim, Woo-Hyoun;Lee, Hyoung-Seok;Kim, Young-Sik;Park, Sung-Moo
    • Journal of Korean Association for Spatial Structures
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    • v.5 no.2 s.16
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    • pp.65-71
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    • 2005
  • The reinforced concrete becomes deteriorated. In strengthening of reinforced concrete structure, it is recently useing FRP. In research, flexural strengthening of reinforced concrete beam can be Efficient design. But shear srengthening og reinforced concrte beam can't be Efficient design by variable cause. The purpose of this study is to investigate the shear resisting effect of filling-up CFRP in reinforced concrete beams with web reinforced. Ten specimens were manufactured and tested. In the test result, it was analysis. The main variables in the test were a space of web reinforcement and a direction of CFRP.

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Shear Reinforcement for Flat Plate-Column Connections Using Lattice Bars (래티스 철근을 이용한 무량판-기둥 접합부의 전단보강)

  • Ahn Kyung-Soo;Park Hong-Gun
    • Journal of the Korea Concrete Institute
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    • v.17 no.2 s.86
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    • pp.191-200
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    • 2005
  • Flat plate-column connections are susceptible to brittle punching shear failure, which may result in collapse of the overall structure. In the present study, a new shear reinforcement for the plate-column connection, the lattice shear reinforcement was developed. Experimental study for the lattice shear reinforcement was performed. Shear strength and ductility of the specimens reinforced with the lattice bars were compared with those of unreinforced specimens. The test results showed that the strength and ductility of the specimens with the lattice shear reinforcement were improved by 1.37 and 9.16 times those of the unreinforced specimens, respectively. These results indicates that the lattice shear reinforcement is superior in ductility to the shear stud-rail which is popular in U.S. Based on the test results, the design method for the lattice shear reinforcement was developed.

Evaluation of Punching Shear for Flat Plates Using GFRP Plate Shear Reinforcement (GFRP 판을 전단보강재로 사용한 플랫 플레이트의 뚫림전단 성능 평가)

  • Lee, Young Hak;Kim, Min Sook;Hwang, Seung Yeon;Choi, Jinwoong;Kim, Heecheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.27 no.5
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    • pp.413-420
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    • 2014
  • The purpose of this study is to experimentally investigate the shear behavior of flat plate that reinforced by embedded GFRP(glass fiber reinforced polymer) plate with openings. Shape of the GFRP shear reinforcement is a plate with several openings to ensure perfect integration with concrete. The test was performed on 7 specimens to check shear strength of flat plate that reinforced by GFRP plate. The parameters include the spacing of the shear reinforcement and amount of the shear reinforcement. The result of test showed that when amount of shear reinforcement was increased, shear strength improved. The result of test showed that maximum shear strength was confirmed when spacing of shear reinforcement was 0.3d. The calculation of the shear strength of reinforced flat plate with GFRP plate based on the KCI was compared with the test results.

An Experimental Study on Shear Behaviors for Reinforced Concrete Beams Embedded with GFRP Plate with Openings (매립형 유공 GFRP 판으로 보강된 RC보의 전단거동에 관한 실험적 연구)

  • Choi, Jong-Hoon;Kim, Min-Sook;Kim, Hee-Cheul;Lee, Young-Hak
    • Journal of the Korea Concrete Institute
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    • v.24 no.4
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    • pp.407-414
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    • 2012
  • The purpose of this study is to experimentally investigate the shear behavior of reinforced concrete beams embedded with GFRP (glass fiber reinforced polymer) plate with openings. In this study, the parameters include the shape of reinforcement, reinforcement area, and thickness and width of reinforcements. The test was performed on 9 specimens with shear spanto-depth ratio of 2.8. When the reinforcement area was varied, the GFRP plate showed 3.6 times greater shear strength than steel stirrup. The test result showed that shear strength increased as reinforcement area increased. Also, when the shape of a parallelogram GFRP plate was used, it showed higher shear strength than that with rectangular shape. Effect of thickness and width of reinforcement showed that shear capacity increased as width increased. For a comparison study, a calculation of the shear strength of reinforced beams with GFRP plate based on the ACI 318M-08 was compared with the test results. The test results were compared with the maximum shear reinforcement areas required by ACI 318M-08, CSA-04, and EC2-02 provision.

An Experimental Study of Shear Capacity for One-way Concrete Slabs Reinforced with Amorphous Micro Steel Fibers (비정질 강섬유 보강 일방향 콘크리트 슬래브의 전단성능에 대한 실험적 연구)

  • Kim, Seon-Du;Choi, Kyoung-Kyu;Choi, Oan-Chul;Choi, Se-Jin
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.1 no.2
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    • pp.128-135
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    • 2013
  • In this study, one-way shear tests were performed to investigate the shear capacity of amorphous steel fiber-reinforced concrete slabs. Primary test parameters were the shear reinforcing method(Stirrups or amorphous steel fibers) and shear reinforcement ratio(0.25 and 0.5%). A series of four one-way slab specimens including a specimen without shear reinforcement and three specimens with shear reinforcements(stirrup, 0.25%, and 0.5% amorphous steel fibers) were tested. The test results showed that 0.25% amorphous steel fibers improved the shear capacity, but 0.5% amorphous steel fibers did not improve the shear capacity compared to the specimen with conventional shear reinforcement of 0.25%. Additional study is needed to understand the variation of shear capacity according to fiber volume fraction.

Experimental Study on Shear Strength of Concrete Deep Beam Reinforced FRP Bars (FRP Bar로 보강된 콘크리트 깊은보의 전단강도에 관한 실험적 연구)

  • Cho, Jang-Se;Kim, Min-Sook;Lee, Young-Hak;Kim, Hee-Cheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.1
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    • pp.23-31
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    • 2011
  • This study carried out shear experiment for concrete deep beam reinforced FRP(Fiber Reinforced Polymers) bar to investigate shear strength of deep beam. The test conducted for 15 specimens, and the variables were shear span-to-depth ratio, reinforcement ratio, effective depth, reinforcement components of shear strength. crack, deflection are investigated based on shear experimental. We compared shear strength using ACI 318-08 STM with proposed equations that considered arching action according to shear span-to-depth ratio. Consequently shear strength of deep beam reinforced FRP bar presented higher shear strength than steel bar. ACI STM's predictions are better accurate than other predicting equations.

Evaluation of Shear Capacity According to Transverse Spacing of Wide Beam Shear Reinforced with Steel Plate with Openings (유공형 강판으로 전단보강된 넓은 보에서의 횡방향 보강 간격에 따른 전단성능 평가)

  • Choi, Jin Woong;Kim, Min Sook;Choi, Bong-Seob;Lee, Young Hak;Kim, Heecheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.3
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    • pp.259-266
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    • 2015
  • In this paper, transverse shear spacing and effective depth of wide beams were considered as parameters to evaluate the shear capacity of wide beam according to transverse spacing of steel plates with openings in experimental way. The eight specimens were composed of: five specimens of shear reinforced by steel plates with openings and three non-reinforced specimens. Crack, failure mode, strain and load-displacement curve of specimens were analysed. Shear contribution of shear reinforcement is evaluated and maximum transverse spacing of shear reinforcement was proposed. Shear strength of the specimen that reinforced with three stirrup legs was higher than shear strength of the specimen that reinforced with two stirrup legs. And as the effective depth increased, shear strength was increased.

Evaluation of Shear Capacity of Wide Beam Reinforced with Shear Plates with Openings (유공형 판으로 전단보강된 넓은 보의 전단거동 평가)

  • Ko, Myung Joon;Lee, Young Hak;Kim, Min Sook;Park, Jong Yil;Kim, Heecheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.6
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    • pp.667-674
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    • 2015
  • In this paper, shear behavior of concrete wide beam reinforced with plates with openings was evaluated. For this evaluation, evelen specimens were manufactured. One specimen was non-shear reinforced, five specimens were reinforced with steel plates and the other five specimens were reinforced GFRP plates. Shear strengths measured through experiments were compared with ones calculated from the equation provided by ACI 318. Longitudinal spacing of shear reinforcement, transverse spacing of shear reinforcement and shear reinforcement material were considered as variables. Test results showed that the shear strength increased as the transverse and longitudinal spacing of shear reinforcement became narrow. Also, regardless of material type of shear reinforcement, the shear capacity was similar when the amount of shear reinforcement was the same.