• Title/Summary/Keyword: FRP rod

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Strength of Insulator FRP Rod According to the Winding of Glass Fiber (전기절연용 FRP의 와인딩 각도에 따른 강도특성)

  • 박효열;강동필
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.586-588
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    • 2001
  • Inner part of FRP specimen was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to study the effect of fiber orientatons on the strength of FRP. The strength of bending and compression was simulated and evaluated. The results of simulated strength and evaluated strength were different greately each other. The stress which affect the feature of FRP was simulated to investigate the difference of the results between simulation and evaluation Shear stresses were investigated to the main stress to affect the fracture of FRP.

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Estimation of Shear Carrying Capacity on Concrete Beams, Reinforced with FRP Rods (FRP Rods로 보강한 콘크리트 보의 전단 내하력의 평가)

  • 최익창;연준희;고재용
    • Journal of Ocean Engineering and Technology
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    • v.18 no.1
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    • pp.63-68
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    • 2004
  • The purpose of this study is to estimate the contribution of concrete and shear reinforcement, in shear carrying capacity, on concrete beams, reinforced with steel and/or FRP rods. The experimental tests for 12 concrete beams, reinforced with steel and/or FRP rods, are carried out. Experimental parameters includes the mechanical properties of reinforcements in shear and bending, and the ratio of shear reinforcement. This study compares the experimental results of shear carrying capacity in concrete beams, reinforced with steel and/or FRP rods, with the proposed equations. According to the experimental results, the effect of the concrete in concrete beams reinforced with FRP rods is decreased with decreasing Young's modulus of longitudinal tensile reinforcement. This results from the large deflection of concrete beams reinforced with decreasing Young's modulus of longitudinal tensile reinforcement. Also, the contribution of shear reinforcement is smaller than the calculated value, using the truss analogy. This results from the fact that the stress redistribution is not exhibited after the break of shear reinforcement.

Mechanical Properties of Insulator FRP Rod According to the Winding Orientation of Glass Fiber (유리섬유의 배향에 따른 전기절연용 FRP의 강도특성)

  • Park, Hyo-Yeol;Gang, Dong-Pil;Han, Dong-Hui;Pyo, Hyeon-Dong;Kim, Tae-Ok
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.6
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    • pp.321-327
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    • 2000
  • FRP has been used very much as high strength and electrical insulation materials. The fiber contributes the high strength and modulus to the composite. The main roles of the matrix in composite materials like FRP are to transmit and distribute stresses among the individual fibers. The fiber orientation in FRP has a great effect on the strength of FRP because the strength of FRP mainly depends on the strength of fiber. In this study, compressive and bending stresses of FRP rods were simulated and measured according to the winding orientation of glass fiber. Inner part of FRP was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to give fiber orientation to the FRP. The shear stresses had great effect on the strength of FRP although the stress of parallel direction of FRP was much higher. The tendency of compressive and bending strengths with glass fiber orientation was different each other.

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An approach to a novel modelling of structural reinforced glass beams in modern material components

  • Foti, Dora;Carnimeo, Leonarda;Lerna, Michela;Sabba, Maria Francesca
    • Advances in Computational Design
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    • v.7 no.3
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    • pp.173-188
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    • 2022
  • In modern buildings, glass is considered a structurally unsafe material due to its brittleness and unpredictable failure behavior. The possible use of structural glass elements (i.e., floors, beams and columns) is generally prevented by its poor tensile strength and a frequent occurrence of brittle failures. In this study an innovative modelling based on an equivalent thickness concept of laminated glass beam reinforced with FRP (Fiber Reinforced Polymer) composite material and of glass plates punched is presented. In particular, the novel numerical modelling applied to an embedding Carbon FRP-rod in the interlayer of a laminated structural glass beam is considered in order to increase both its failure strength, together with its post-failure strength and ductility. The proposed equivalent modelling of different specimens enables us to carefully evaluate the effects of this reinforcement. Both the responses of the reinforced beam and un-reinforced one are evaluated, and the corresponding results are compared and discussed. A novel equivalent modelling for reinforced glass beams using FRP composites is presented for FEM analyses in modern material components and proved estimations of the expected performance are provided. Moreover, the new suggested numerical analysis is also applied to laminated glass plates with wide holes at both ends for the technological reasons necessary to connect a glass beam to a structure. Obtained results are compared with an integer specimen. Experimental considerations are reported.

Structure of Station Class Lightning Arresters and Electrical Characteristics of ZnO Varistor Blocks (발변전용 피뢰기의 구조 및 ZnO 바리스터 소자의 전기적 특성)

  • Cho, Han-Goo;Han, Se-Won;Lee, Un-Yong;Yoon, Han-Soo;Choi, In-Hyuk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.1158-1161
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    • 2004
  • This paper presents structural characteristics of station class lightning arresters and electrical characteristics of manufactured ZnO varistor blocks which are usable in those arresters. Three types of station class lightning arresters were investigated and those are a ceramic arrester, a FRP tube type polymer arrester, and a FRP rod type polymer arrester. Each arrester has merits and demerits with structural characteristics. In general, polymer arresters were made of silicon rubber for housing materials, FRP tube or rod for mechanical strength, ZnO blocks for electrical characteristics, and metal parts for electrical contact and the silicon rubber, the housing materials, was directly injected to the arrester module which was assembly composed of electrodes, ZnO blocks and FRP tube or rod, and to prevent the nonlinear electric fields distribution on upper parts of arresters, the grade ring was adopted to the upper electrodes. The reference voltage, nonlinear coefficient, residual voltage, and voltage ratio of manufactured ZnO varistors are 4.90kV, 50, 9.54kV, 1.94, respectively. Compared to designed electrical characteristics, the reference voltage was low for 600v and the voltage ratio was slightly high. However, the characteristics of discharge withstand was so excellent that the mechanical destruction does not occur at the impulse current of $8/20{\mu}s$ 10kA for 100 times.

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Compressive Strength of FRP for Insulator According to Winding Angles (절연용 FRP의 와인딩 각도에 따른 압축강도 연구)

  • Park, Hoy-Yul;Kang, Dong-Pil;Ahn, Myeong-Sang;Myung, In-Hae
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1439-1441
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    • 2003
  • 전기절연재의 구조재로 많이 사용되고 있는 FRP(fiber reinforced plastics)는 열경화성 수지를 접착성 결합제(binder)로 하고 고강도 섬유를 보강재로 한 복합재료로서 기계적, 화학적, 전기적 특성이 매우 우수하다. FRP의 기계적 강도는 유리섬유에 의존 하고 있으므로 유리섬유의 방향과 힘을 가하는 방향에 따라서 그 강도의 차이는 매우 크게 나타난다. 본 연구에서는 섬유의 배향에 따른 강도의 변화를 이해하기 위하여 시편을 제작하여 압축강도를 측정하고 압축강도와 응력의 분포를 유한요소법으로 시뮬레이션하였다. FRP rod에 압축응력이 가해졌을 때 섬유의 배향에 따른 파괴강도와 응력의 분포를 유한요소법을 이용하여 시뮬레이션하였고 모델링에는 3-D Shell과 3-D Brick 요소를 사용하였다. 제작된 시편의 강도특성과 시뮬레이션을 통한 응력의 분포를 서로 비교하여 시편의 파괴에 미치는 응력을 고찰하였다.

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Improvement and Evaluation of Seismic Performance for Reinforced Concrete Beam-Column Joints Using High Performance Embedded FRP (고성능 FRP를 활용한 철근콘크리트 보-기둥 접합부의 내진 성능 평가 및 개선)

  • Ha, Gee-Joo;Shin, Jong-Hack;Kang, Hyun-Wook
    • Journal of the Korea Concrete Institute
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    • v.23 no.3
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    • pp.385-392
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    • 2011
  • 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 (steel plate, carbon fiber sheet, and embedded carbon fiber rod) in existing reinforced concrete buildings. Six specimens of retrofitted beam-column joints are constructed using various retrofitting materials and tested for their retrofit performances. Specimens designed by retrofitting the beam-column joint regions (LBCJ series) of existing reinforced concrete building showed a stable mode of failure and an increase in load-carrying capacity due to the effect of crack control at the time of initial loading and confinement from retrofitting materials during testing. Specimens of LBCJ series, designed by the retrofitting of FRP in reinforecd beam-column joint regions increased its maximum load carrying capacity by 26~50% and its energy dissipation capacity by 13.0~14.4% when compared to standard specimen of LBCJC with a displacement ductility of 4.

Experimental bond behavior of hybrid rods for concrete reinforcement

  • Nanni, Antonio;Nenninger, Jeremy S.;Ash, Kenneth D.;Liu, Judy
    • Structural Engineering and Mechanics
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    • v.5 no.4
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    • pp.339-353
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    • 1997
  • Fiber reinforced plastic (FRP) rods provide certain benefits over steel as concrete reinforcement, such as corrosion resistance, magnetic and electrical insulation, light weight, and high strength. FRP composites can be combined with a steel core to form hybrid reinforcing rods that take advantage of properties of both materials. The objective of this study was to characterize the bond behavior of hybrid FRP rods made with braided epoxy-impregnated aramid or poly-vinyl alcohol FRP skins. Eleven rod types were tested using two concrete strengths. Specific topics examined were bond strength, slip, and type of failure in concentric pull-out tests from concrete cubes. From analysis of identical pull-out tests on both hybrid and steel rods, information on relative bond strength and behavior were obtained. It is concluded that strength is similar but slip in hybrid rods is much higher. Hybrid rods failed either by pull-out or splitting the concrete block (with or without yielding of the steel core). Experimental data showed consistency with similar test results presented in the literature.

An Experimantal Study on Flexural Behavior of RC Beams Strengthened with Near Surface Mounted Prestressed FRP (프리스트레스를 도입한 FRP 표면매립 보강보의 휨거동에 관한 실험적 연구)

  • Hong, Sung-Nam;Park, Jun-Myung;Park, Sun-Kyu;Park, Jong-Sup;Park, Young-Hwan
    • Journal of the Korea Concrete Institute
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    • v.18 no.6 s.96
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    • pp.737-742
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    • 2006
  • Strengthening concrete structures with fiber reinforced polymer materials have grown to be a widely used method over most parts of the world today, which FRP was developed in 1960. A method to apply prestressing force to FRP is developed newly in these days, which can use the maximum performance of FRP materials. This paper presents the results of a study on improvement in flexural capacities of RC beams strenthened with near surface mounted prestressed CFRP rod and plate. Experimental variables include type of CFRP, prestressing level. Tests show that prestressed beams exhibit a higher crack-load as well as a higher steel-yielding load compared to non-prestressed strengthened beams.

Reliability of FRP Insulated Rod for GIS(Gas Insulated Switchgear) (GIS용 FRP 절연로드 신뢰성시험)

  • Kim, J.B.;Yang, D.I.;Jin, S.Y.;Song, W.P.;Heo, J.C.;Park, T.G.;Ko, H.S.;Choi, I.H.
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.1646-1648
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    • 2004
  • 수입외자재에 의존하고 있는 GIS(Gas Insu.lated Switchgear)용 FRP 절연로드의 전기적, 기계적 신뢰성시험에 대하여 언급하고자하며, 본 논문에 기술된 신뢰성시험을 통하여 제품특성을 재확인하였으며 최소 GIS의 수명과 동일함을 확인, 파악함으로써 국산화 개발을 실현하였다.

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