• Title/Summary/Keyword: carbon fiber sheet reinforcing

Search Result 31, Processing Time 0.02 seconds

An Experimental Study on Flexural and Shear Strength of Reinforced Concrete Beam Using Reinforcing Materials (보강재를 사용한 철근콘크리트 보의 휨·전단내력에 관한 실험적연구)

  • Hong, Sang-Kyun;Eun, Hee-Chang;Park, Ki-Choul;Chung, Heon-Soo
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.1 no.1
    • /
    • pp.65-73
    • /
    • 1997
  • In this paper, It is the effect of using fiber sheet (Carbon Fiber Sheet & Aramid Fiber Sheet) and Steel Plate for reinforced concrete beam. 25 specimens are tested, 16 specimens are for bending capacity and the other are for shear capacity. In the case of bending testing, the kind and quantity of the reinforcement materials, the bondage and the existence of crack were selected as experimental variables. In the case of shear testing, It is testified the effect of reinforcement with the variables of the method of reinforcement (side type and U type). As a result, Using the reinforcing materials can increase the capacity of bending and shear stress.

  • PDF

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
    • /
    • v.27 no.2
    • /
    • pp.115-123
    • /
    • 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.

A Study on the Shear Strengthening Effect of Reinforced Concrete Beams with Structural Damage (구조적 손상을 입은 철근콘크리트 보의 전단보강 효과에 관한 연구)

  • Shin, Yong-Seok;Kim, Jeong-Hoon;Kim, Jeong-Sup;Kim, Kwang-Seok;Cho, Cheol-Hee
    • Journal of the Korea Institute of Building Construction
    • /
    • v.8 no.5
    • /
    • pp.43-51
    • /
    • 2008
  • This study examines shear capacity performance and structural characteristics of reinforced concrete beam using carbon fiber sheet(CFS), g)ass fiber sheet(GFS), glass fiber steel plate(GSP) and carbon fiber bar CB) which are reinforcing materials for reinforced concrete beam in order to produce similar condition to repair and reinforce actual structure and aims to provide data available In designing and constructing reinforced concrete structures under the structural damage. This study obtains the following conclusions. After considering the shear experiment results. it was indicated that the CB reinforced test object was the best in the shear capacity improvement and ductility capacity as it was contained in the concrete and was all operated, Also, GFS reinforced test object indicated the reduced flexural capacity but good shear capacity. GSP reinforced test object had bigger reinforcing strength than other reinforcing test objects. On the other hand, it showed the lowest reinforcement effect as compared section thickness of reinforced material because it showed the bigger relativity a section thickness of reinforced material. If the adherence to the concrete is improved, it will seem to show bigger reinforcement effect.

Effect of Unidirectional Carbon Fiber Sheet Manufacturing Process Using Coated Glass Fiber and Carbon Fiber on Concrete Reinforcement (유리섬유 코팅사와 탄소섬유를 이용한 일방향 탄소섬유시트 제조공정이 콘크리트 보강에 미치는 영향)

  • Kwon, Jieun;Kwon, Sunmin;Chae, Seehyeon;Jeong, Yedam;Kim, Jongwon
    • Textile Coloration and Finishing
    • /
    • v.34 no.3
    • /
    • pp.185-196
    • /
    • 2022
  • In this study, carbon fiber and coated glass fiber are applied to warp and weft fiber in order to reduce the amount of carbon fiber used in carbon fiber fabrics, which are often used for reinforcement of building structures. A low-cost thermoplastic resin was coated on glass fibers to prepare a shape-stabilizing glass fiber. A unidirectional carbon fiber sheet was manufactured using the prepared coated glass fiber and carbon fiber. In order to identify whether it can be used for reinforcing architectural and civil structures, it was attached to a concrete specimen and its mechanical properties were analyzed. The optimum manufacturing conditions for the coated glass fiber were 0.3 mm in diameter of the coating nozzle, the coating temperature was 190 ℃, and the coating speed was 0.3 m/s. 14 mm was optimal for the weft spacing of the coated glass fiber. The flexural strength of the concrete reinforced with the manufactured unidirectional carbon fiber sheet was slightly lower than that of the concrete reinforced with carbon fiber fabric, but it was confirmed that the reinforcement effect was better when the amount of carbon fiber was considered.

Structural behavior of R/C Slabs Strengthened with Steel Plate, Carbon fiber sheets, and Carbon Fiber Laminate. (강판, 탄소섬유쉬트, 탄소섬유판으로 휨보강된 철근콘크리트 슬래브의 구조적 거동)

  • Lee, Young-Jea;Moon, Heui-Jeung;Lee, Kyung-Un;Chung, Lan;Jung, Sang-Jin
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1998.04b
    • /
    • pp.601-606
    • /
    • 1998
  • In recent years, strengthening by steel plate, carbon fiber sheets, and carbon fiber laminate in spotlighted in order to repair and rehabilitation of R/C slabs. In this study, 3 method of rehabilitation are analyzed from the tests. Test parameters are the width of cracks, the method of repair and rehabilitation, the magnitude of pre-load. Deflection, failure load, strains of reinforcing bar, strains of sheet and plates are measured during tests. The failure mode and separption load analyzed from these measured data.

  • PDF

Structural behavior of R/C Beam Strengthened with Steel Plate, Carbon Fiber Sheets, and Carbon Fiber Laminate. (강판, 탄소섬유쉬트, 탄소섬유판으로 휨보강된 천근콘크리트보의 구조적 거동)

  • Lee, Young-Jea;Moon, Heui-Jeung;Lee, Kyung-Un;Jung, Sang-Jin;Chung, Lan
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1997.10a
    • /
    • pp.691-696
    • /
    • 1997
  • In recent years, stengthening of beam by steel plate, carbon fiber sheets, and carbon fiber laminate is spotlighted in order to repair and rehabilitation of R/C structures. In this study, 3 method of rehabilitation technic are analyzed from the tests. Test parameters are the width of cracks, the method of repair and rehabilitation, the magnitude of existing load. Deflection, failure load, strains of reinforcing bar, strains of sheet and plates are measured during tests. The failure mode and ultimate load are analyzed from these measured data. Test result shows that the width of cracks and the magnitude of existing load do not make any difference of ultimate flexural capacity.

  • PDF

A Study on Carbon Fiber Sheet Rehabilitation of Reinforced High Strength Concrete Beams (고강도 RC보의 탄소섬유쉬트 보강에 대한 연구)

  • 김종효;곽계환
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1997.10a
    • /
    • pp.450-455
    • /
    • 1997
  • In recent years the research and development about the new material proceeds rapidly and actively in building industry. We are concerned with high-strength concrete as a new material. As the building structure becomes bigger, higher and more specialized, so does the demand of material and member with high strength for building expands greatly. In the future, we will quite need to research repair and rehabilitation to make high strength concrete structural building for our safe. So, I did an study on carbon fiber sheet rehabilitation(CFSR) of reinforced high strength concrete beams. The carbon fiber reinforced plastic(CFRP) bonding method is widely used for reinforcing the existing concrete structure among the various methods. The test results indicate that CFS is very effective for strengthening the damaged beams and controlling deflections of the repaired beams. When carbon fiber sheet rehabilitation of reinforced high strength concrete beams happened diagonal crack, the increase in the number of CFS layer didn't effect the increase in strength of beams. Also, by changing the CFS stick position gave diversified ultimate load in CFSR beams.

  • PDF

An Experimental Study to Prevent Debonding Failure of Full-Scale RC Beam Strengthened with Multi-Layer CFS

  • You Young-Chan;Choi Ki-Sun;Kim Keung-Hwan
    • Journal of the Korea Concrete Institute
    • /
    • v.16 no.6 s.84
    • /
    • pp.867-873
    • /
    • 2004
  • It has been known that debonding failures between CFS(Carbon Fiber Sheet) and concrete in the strengthened RC beams are initiated by the peeling of the sheets in the region of combined large moment and shear forces, being accompanied by the large shear deformation after flexural cracks. These shear deformation effects are seldom occurred in small-scale model tests, but debondings due to the large shear deformation effects are often observed in a full-scale model tests. The premature debonding failure of CFS, therefore, must be avoided to confirm the design strength of full-scale RC beam in strengthening designs. The reinforcing details, so- called 'U-Shape fiber wrap at mid-span' which wrapped the RC flexural members around the webs and tension face at critical section with CFS additionally, were proposed in this study to prevent the debonding of CFS. Other reinforcing detail, so called 'U-Shape fiber wrap at beam end' were included in this tests and comparisons were made between them.

A Foundamental Study on Evaluation of Adhesive Strength in Reinforced Position Concrete Structure Used Fiber Sheet (섬유쉬트 보강부위의 부착성능 평가에 관한 기초연구)

  • 안상철;곽규성;이성혁;오상근;박국배;안상덕
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1998.04b
    • /
    • pp.613-617
    • /
    • 1998
  • This study deals with the effect on adhesive strength properties of fiber sheet layer and maintenance position of coccrete structure reinforced using epoxy resin carbon and aramit fiber sheet. Properties of epoxy resin adhesive strength of the concrete bridge slab, tunnel and wall etc. reinforced using fiber sheet under many different environment change according to condition of concrete substrate, temperature, moisture, curing, cleaning, and chemical effects and so on. The purpose of this study is that it makes the estimation value of adhesive strength of concrete substrate and fiber sheet reinforcing layer penetrated epoxy resin under high temperature(9$0^{\circ}C$), chemical attack and condition of curing.

  • PDF

The Strengthening Effects of Concrete Columns Confined with Carbon Fiber Sheets along the Fiber Direction (탄소섬유쉬트 올방향에 따른 콘크리트 기둥 보강성능)

  • Kim, Yang-Jung;Hong, Gap-Pyo
    • Journal of the Korea Institute of Building Construction
    • /
    • v.11 no.4
    • /
    • pp.326-332
    • /
    • 2011
  • Carbon, Aramid, Boron and Glass fibers are used as fibrous materials to promote structural bearing strength. Of these fiber types, carbon fiber is the most commonly used material, and is characterized by having a one-way direction, which is strengthened by tensile strength due to the attached direction only, while other types of fibers are two-way. Therefore, when applied in the field, the attachment direction of fiber is a very important factor. However, when fiber direction is not mentioned in the design drawing, there sometimes is no improvement in structural strength, as the fiber is being installed by a site engineer or workers who lack structural knowledge. The purpose of this study was to propose an optimal direction of carbon fiber through a comparison & analysis of reinforcing efficiency with reinforced experimental columns that used carbon fibers in each of the inclined, horizontal and vertical directions. According to the results, horizontal direction in the reinforced column was improved by 153.43%, but vertical direction was 104.61% only, and it was understood this was due to increased tensile strength along the fiber direction. For this reason, it is necessary to include information regarding fiber direction in design and site management.