• Title/Summary/Keyword: 탄소섬유 ROD

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Self-Diagnosis for Fracture Prediction of Concrete Reinforced by New Type Rib CFGFRP Rod and CF Sheet (신형 리브재 CFGFRP 보강근 및 CF 보강시트로 보강된 콘크리트의 파괴예측 자가진단)

  • Park, Seok-Kyun
    • Journal of the Korean Society for Nondestructive Testing
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    • v.27 no.2
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    • pp.115-123
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    • 2007
  • For investigating self-diagnosis applicability, a method based on monitoring the changes in the electrical resistance of carbon fiber reinforced concrete has been tested. Then after examining change in the value of electrical resistance at each flexural weight-stage of carbon fiber in CFGFRP (carbon fiber and glass fiber reinforcing plastic) with new type rib and carbon sheet for concrete reinforcing, the correlations of electrical resistance and load as a function of strain, deflection were analyzed. As the results, it is clarified that when carbon fiber rod, rib and sheet fracture, the electrical resistance of it increase largely, and specially in case of CFGFRP, afterwards glass fiber tows can be resist the load due to the presence of the hybrid (carbon and glass) reinforced fiber. Therefore, it can be recognized that reinforcing bar and new type rib of CFGFRP and sheet of CF could be applied for self-diagnosis of fracture in reinforced FRP concrete.

Assessment of Ductility for the RC Piers with Transverse Reinforcement and Application of Carbon-Fiber Red (횡방향 구속철근의 배근방법에 따른 철근콘크리트 교각의 연성 평가 및 탄소섬유 ROD의 적용)

  • 이영호;이학은
    • Journal of the Korea Concrete Institute
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    • v.14 no.1
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    • pp.8-15
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    • 2002
  • This paper presents a study carried out for the seismic capacity in reinforced concrete(RC) piers by the confinement effect of transverse reinforcement as such a hooked-tied, welded-tied and spiral reinforcement. In order to assess the seismic capacity with transverse reinforcement, experiment리 and analytical methods were adopted. A RC column survey was conducted based on eight one-fourth scale single circular column specimens designed and tested under slow horizontal cyclic loads. Two cases were analyzed. The confinement effect of concrete by transverse reinforcement is considered not in Case 1 but in Case 2. Also, we studied the propriety of making use of the method in which a carbon fiber rod replace spiral reinforcement in RC piers. In experimental tests, a welded-tied and spiral reinforcement has a good seismic capacity, but a carbon fiber rod presents low ductility in comparison with a hooked-tied reinforcement. In an analytical study, displacement ductility is approximate to the experimental result because of considering the confinement effect of the transverse reinforcement. Even if the confinement effect of the transverse reinforcement is considered, the analytical results for ductility of the specimens with welded-tied and spiral reinforcement show an excessive underestimation of the experimental results.

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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The Fatigue behavior of strengthened bridge deck with Carbon Fiber Rod (탄소섬유 Rod로 성능향상된 교량 바닥판의 피로거동)

  • 심종성;김민수;김영호;주민관
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.313-318
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    • 2002
  • The use of carbon fiber rods is a promising technology of increasing flexural and shear strength of deficient reinforced concrete members. The purpose of this experimental study is to investigate the fatigue behavior and strengthening effects of the strengthened bridge deck with isotropic and othortropic carbon fiber rod. This study shows a fatigue loading, compliance and S-N Curve between strengthened isotropically and othortropically. Then estimate the effective fatigue behavior of RC slab using composite rods that are inserted in high special purposed polymer mortar.

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Improvement and Evaluation of Seismic Performance of Reinforced Concrete Exterior Beam-Column Joints Retrofitting with Fiber Reinforced Polymer Sheets and Embedded CFRP Rods (섬유시트와 매입형 CFRP Rod를 보강한 R/C 외부 보-기둥 접합부의 내진성능 평가 및 개선)

  • Ha, Gee-Joo;Ha, Young-Joo;Kang, Hyun-Wook
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.2
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    • pp.151-159
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    • 2015
  • In this study, experimental research was carried out to evaluate and improve the seismic performance of reinforced concrete beam-column joint regions using strengthening materials (CFRP sheet, AFRP sheet, embedded CFRP rod) in existing reinforced concrete structure. Therefore it was constructed and tested seven specimens retrofitting the beam-column joint regions using such retrofitting materials. Specimens, designed by retrofitting the beam-column joint regions of existing reinforced concrete structure, were showed the stable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading and confinement of retrofitting materials during testing. Specimens LBCJ-CRUS, designed by the retrofitting of CFRP Rod and CFRP Sheet in reinforecd beam-column joint regions were increased its maximum load carrying capacity by 1.54 times and its energy dissipation capacity by 2.36 times in comparison with standard specimen LBCJ for a displacement ductility of 4 and 7. And Specimens LBCJ-CS, LBCJ-AF series were increased its energy dissipation capacity each by 2.04~2.34, 1.63~3.02 times in comparison with standard specimen LBCJ for a displacement ductility of 7.

The Study on Flexural Behavior of Reinforced Concrete Beams Strengthened with the Carbon Fiber Rod (탄소섬유 Rod로 성능향상된 R/C보의 휨 거동 연구)

  • 심종성;문도영;김영호;김동희
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.611-616
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    • 2002
  • The concrete beam is quickly required to be replaced or strengthened due to decreasing load carrying capacity. Flexural tests on 3.1m long reinforced concrete beams with carbon-fiber rod are reported. The selected experimental variable is the method of the anchoring beam. The effects of this variable in overall behavior are discussed. This paper considered relation of load-displacement and load-strain. The maximum load was increased to the static behavior of the R/C beam strengthened with CFR rod. The results indicated generally that the flexural strength of strengthening beam was increased. It was required a proper anchorage system and can be led the ductility of beams of a carbon-fiber rod.

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New Technique on the Improvement of Earthquake-Resistant Performance for the Retrofitting of Existing Reinforced Concrete Beam-Column Joints (철근콘크리트 보-기둥 접합부의 내진성능 개선 보강 신기술)

  • 하기주
    • Journal of the Earthquake Engineering Society of Korea
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    • v.8 no.2
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    • pp.73-81
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    • 2004
  • In this study, experimental research was carried out to improve earthquake-resistant performance for the retrofitting of reinforced concrete beam-column joints using carbon fiber materials in existing reinforced concrete building. Six reinforced concrete beam-column joints were constructed and tested to evaluate the retrofitting effect of test variables, such as the retrofitting materials and retrofitting region(plastic hinge, beam-column joint) under load reversals. Test results show that retrofitting specimen(RPC-CP2, RPC-CR, RJC-CP, RJC-CR), using new materials(carbon fiber plate, carbon fiber rod and carbon fiber sheet), designed by the improvement of earthquake-resistant performance and ductility, attained more load-carrying capacity and stable hysteretic behavior.

An Experimental Study on the Strengthening Effect of RC Beams Strengthened by CFRP (탄소섬유 보강재로 보강한 RC 보의 보강효과에 관한 실험적 연구)

  • Kim, Jae-Hun;Park, Sung-Moo;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.5 no.4 s.18
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    • pp.71-77
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    • 2005
  • Bonded CFRP Plate method used murk in reinforcement method is very efficient for stress increment of reinforced members. But CFRP plate dosen't display enough its capacity and have the destruction characteristic of premature failure that reach failure by debond plate, because near-surface-bond using epoxy. Such destruction character of reinforced specimens take the influence at variables as steel reinforcement ratio, concrete strength, kind of reinforcement materials, reinforced length, property of epoxy used in binder and so on. In this study, performed experiment results are compared and considered on flexural performance of Near Surface Mounted Reinforcement used CFRP-Rod, as complement about structural behavior of RC beam reinforced flexural capacity in CFRP plate and premature failure of reinforcement material. Main variables of RC beam applied CFRP Plate external bond method are experimental variables as reinforcement length, reinforcement position (tension face and side face of beam) and existence of ironware in end parts. In case of CFRP-Rod, variable is reinforcement length.

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Development of the CFRP Automobile Parts Using the Joint Structure of the Dissimilar Material (결합부 강화구조용 탄소복합재 자동차 부품 개발)

  • Ko, Kwan Ho;Lee, Min Gu;Huh, Mongyoung
    • Composites Research
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    • v.31 no.6
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    • pp.392-397
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    • 2018
  • In this study, the development purpose is to replace steel Tie Rod of commercial vehicle to the carbon composite by a braiding process. CFRP tie rod was designed to meet the performance requirements of existing products by designing the cross section of the core for braiding weaving and the structural design of the joint between the core and the carbon fiber. The specimens were fabricated by braiding method and applied to structural analysis through test evaluation. The manufacturing process proceeded from braiding to infusion through post-curing process. The test evaluation of the final product was satisfactorily carried out by sequentially performing tensile test, torsion test, compression test and fatigue test. In addition, the weight of CFRP tie rod could be reduced by about 37% compared to existing products.

An Experimental Study on the Flexural Behavior of Pre-loaded RC Beams Strengthened with CFRP-Rod (선하중(先荷重)을 받은 RC보의 CFRP-Rod 휨보강 효과에 대한 실험적 연구)

  • Ye, Sang-Min;Chun, Woo-Chul;Kang, Joo-Won;Park, Sung-Moo
    • Journal of Korean Association for Spatial Structures
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    • v.7 no.1 s.23
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    • pp.79-85
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    • 2007
  • Steel plate bonding method with epoxy is common applied to repair and strengthen RC structures, but Steel is apt to corrode quickly, hard to manufacture and heavy. To overcome these defects, it is carried out research on strengthening RC structures with FRP(Fibre Reinforced Polyrner/Plastic) FRP is generally used in the shape of Plate or Sheet, but it has weak point such as premature failure, difficult work. To cope with these problem, NSMR(Near Surface Mounted Reinforcement) which uses CFRP in the shape of Rod is proposed and carried out active research on strengthening effect of variables such as quantity, anchorage length and space of CFRP-Rod. Strengthening with CFRP-Rod is carried out under loading to some degree in fact, and so the amount of pre-loading is selected as variable in this research. The amount of pre-loading is chosen in proportion to nominal strength of non-strengthened specimen with CFRP-Rod.

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