• 제목/요약/키워드: GFRP composite

검색결과 322건 처리시간 0.026초

Analysis of composite girders with hybrid GFRP hat-shape sections and concrete slab

  • Alizadeh, Elham;Dehestani, Mehdi
    • Structural Engineering and Mechanics
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    • 제54권6호
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    • pp.1135-1152
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    • 2015
  • Most of current bridge decks are made of reinforced concrete and often deteriorate at a relatively rapid rate in operational environments. The quick deterioration of the deck often impacts other critical components of the bridge. Another disadvantage of the concrete deck is its high weight in long-span bridges. Therefore, it is essential to examine new materials and innovative designs using hybrid system consisting conventional materials such as concrete and steel with FRP plates which is also known as composite deck. Since these decks are relatively new, so it would be useful to evaluate their performances in more details. The present study is dedicated to Hat-Shape composite girder with concrete slab. The structural performance of girder was evaluated with nonlinear finite element method by using ABAQUS and numerical results have been compared with experimental results of other researches. After ensuring the validity of numerical modeling of composite deck, parametric studies have been conducted; such as investigating the effects of constituent properties by changing the compressive strength of concrete slab and Elasticity modulus of GFRP materials. The efficacy of the GFRP box girders has been studied by changing GFRP material to steel and aluminum. In addition, the effect of Cross-Sectional Configuration has been evaluated. It was found that the behavior of this type of composite girders can be studied with numerical methods without carrying out costly experiments. The material properties can be modified to improve ultimate load capacity of the composite girder. strength-to-weight ratio of the girder increased by changing the GFRP material to aluminum and ultimate load capacity enhanced by deformation of composite girder cross-section.

$\textrm{Al}_2\textrm{O}_3$ Woven-fabric 복합재료의 전자파특성 (Electromagnetic Wave Characteristics of $\textrm{Al}_2\textrm{O}_3$ Woven-Fabric Composites)

  • 박남훈;윤희석
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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    • pp.139-142
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    • 2002
  • Recently, GFRP is well known as a structural material for the radome of aircraft. In this paper, we have observed the reflectivity of electromagnetic waves on GFRP reinforced with $\textrm{Al}_2\textrm{O}_3$ woven fabric. The result of the experiment has revealed that the reflectivity of $\textrm{Al}_2\textrm{O}_3$/GFRP composites is remarkably reduced compared with that of GFRP. And it also shows that the electromagnetic wave reflections are greatly influenced by the number of $\textrm{Al}_2\textrm{O}_3$ plies in a specific frequency band. These results are expected to be utilized for the technique of manufacturing a low-reflectivity composite structure.

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경량 GFRP 패널을 이용한 하수관거공사용 복공 가시설 시스템의 개발 (Development of Lining-Board System Using Light-Weight GFRP Panels for Sewer-Pipe Construction)

  • 박신전;홍기증
    • 복합신소재구조학회 논문집
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    • 제5권3호
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    • pp.23-31
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    • 2014
  • Recently, sewer-pipe constructions replacing deteriorated pipes are currently underway in the downtown area. To resolve many problems in the conventional method of open-cut construction, lining-board system using light-weight GFRP panels is developed. The pultruded GFRP panels can be successfully used for the developed lining-board system as temporary decks and retaining walls in virtue of light weight, high strength and high durability. In this paper, the structural safety and serviceability of the lining-board system are examined through FE analyses and experiments. Further more, a field application of the lining-board system is presented. The field application shows that quality and environment of construction can be significantly improved.

MMA 모르터 복합체의 강도특성 및 부재설계 (I) (Member design and strength characteristics of the MMA mortar composites (I))

  • 지효선
    • 복합신소재구조학회 논문집
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    • 제6권3호
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    • pp.41-49
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    • 2015
  • The repair of manhole raise has been caused much construction times and disruption of traffic flow, serious environmental pollution from crushed construction wastes, and budget waste due to the repeated repair construction works. In order to overcome such problems, we have developed the new manhole repairing composite structures by using a glass fiber-reinforced polymer (GFRP) pipe, which can raise manhole to the regular height of the overlayed road pavement with rapid construction and minimum traffic jams. This environmental-friendly technology is method completed by the methyl methacrylate monomer (MMA) double wide flanged GFRP pipe composite structures in order to raise manhole to the regular height. In this paper, two kinds of the compressive strength tests of MMA mortar composites were conducted and evaluated by a general compressive strength test, and compressive strength test after freezing-thawing resistance test. It was found that this MMA mortar composites will be used for the application of the double wide flanged GFRP pipe composite structures.

교량 바닥판 콘크리트의 시공을 위한 GFRP근의 활용 (Application of GFRP Re-bar in Concrete Bridge Deck Construction)

  • 김지홍;주형중;김병석;윤순종
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 춘계학술발표대회 논문집
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    • pp.152-156
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    • 2003
  • In this paper, we present the results of an experimental research on the load-deflection characteristics of full-scale concrete bridge decks reinforced with GFRP re-bars. Similar researches have been conducted in many countries to extend the service life of concrete bridge decks, which are under harsh environmental condition. Concrete bridge decks are one of the major concerns for the maintenance of bridges. GFRP re-bar available in the domestic construction market was investigated and the concrete deck reinforced with GFRP re-bars was tested under flexure to investigate the applicability of GFRP re-bar on the bridge deck construction.

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알루미늄/GFRP 혼성튜브의 굽힘붕괴 특성 (The characteristics of bending collapse of aluminum/GFRP hybrid tube)

  • 송민철;이정주
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2000년도 추계학술발표대회 논문집
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    • pp.84-87
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    • 2000
  • Square tubes used for vehicle structure components have an important role on keeping its stiffness and preserving occupant safety in vehicle collision and rollover in which it experience axial collapse, bending collapse or both. Bending collapse, which absorbs kinetic energy of the impact and retains a survival space for the occupant, is a dominant failure mode in oblique collision and rollover. Thus, in this paper, the bending collapse characteristics such as the maximum bending moment and energy absorption capacity of the square tube replaced by light-weight material were evaluated and presented. The bending test of cantilever tubes which were fabricated with aluminum, GFRP and aluminum/ GFRP hybrid by co-curing process was performed. Then the maximum bending moment and the energy absorption capacity from the moment-angle curve were evaluated. Based on the test results, it was found that aluminum/ GFRP hybrid tube can show better specific energy absorption capacity compared to the pure aluminum or GFRP tube and can convert unstable collapse mode which may occur in pure GFRP tube to stable collapse mode like a aluminum tube in which plastic hinge is developed.

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Influence of Uncertainties for Compressive Buckling of Composite Materials and Its Numerical Simulations

  • Ueda, Tetsuhiko;Takase, Shouhei;Ikeda, Tadashige;Iwahori, Yutaka
    • Advanced Composite Materials
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    • 제17권2호
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    • pp.177-190
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    • 2008
  • As the first step in discussing the reliability of composite structures, a fundamental study was performed to obtain the scattering characteristics of glass-fiber reinforced plastics (GFRP) and woven carbon fiber reinforced plastics (WCFRP) as well as a reference metal. The Euler buckling load was obtained experimentally for each material. The experiments were conducted for specified rectangular specimens with simply supported edges. A new attachment to realize the simply support boundary conditions for composite materials have been prepared before these experiments. The scattering data in the results for GFRP and WCFRP composites were compared with those of a typical metal of aluminum alloy. The experimental data were also compared with numerical simulations including the uncertainties.

브레이드 투루젼법에 의한 콘크리트 구조물용 하이브리드 섬유강화 복합재료 리바 개발 (Development of Hybrid Fiber Reinforced Plastics Rebar for Concrete Structure by the Braidtrusion Process)

  • 최명선;한길영;이동기;심재기
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2001년도 추계학술발표대회 논문집
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    • pp.199-205
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    • 2001
  • This paper describes the design methodology, manufacturing process, rebar tensile and bending properties. Braidtrusion is a direct Composite fabrication technique utilizing an in-line braiding and pultrusion process. The produced Composite rebar exhibits ductile stress-strain behavior similar to that of conventional steel bar. Various rebar diameters ranging from modeling scale(3m) to full-scale prototype of 9.5mm have been produced Glass Fiber Reinforced Plastics(GFRP) rebar were successfully fabricated at $\phi$8.5mm and $\phi$9.5mm nominal diameters of soild and hollow type using a braidtrusion process. Tensile and bending specimens were tested and compared with behavior of stress-strain of GFRP rebar and steel bar.

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광섬유 TR-EFPI 센서를 이용한 GFRP 직교 적층판의 변형률 해석 (Strain Analysis in GFRP Cross-Ply Laminates Using TR-EFPI Optical Fiber Sensor)

  • 우성충;최낙삼;권일범
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 추계학술발표대회 논문집
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    • pp.150-153
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    • 2003
  • Longitudinal strains({$varepsilon}_x$) of the core and skin layers in glass fiber reinforced plastic(GFRP) cross-ply composite laminates have been studied using the embedded optical fiber sensor of totally-reflected extrinsic Fabry-Perot interferometer(TR-EFPI). Foil-type strain gauges bonded on both the upper and lower surfaces were used for the measurement of the surface strains. Both TR-EFPI sensor and strain gauge bonded on the specimen surface showed excellent agreement within -0.0086 ~ +0.0302% strain. It was shown that values of {$varepsilon}_x$ in the interior of the surface layer and the core layer measured by embedded TR-EFPI sensor was significantly higher than that of the specimen surface measured by strain gauges. The experimental results were ascertained with finite element analysis. Embedded TR-EFPI optical fiber sensor could measure accurately the internal strains which were different from the surface.

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유리섬유보강 폴리머 복합패널의 피로특성 (Fatigue Properties of Glass Fiber Reinforced Polymer Composite Panels)

  • 연규석;김수보;유능환
    • 한국농공학회논문집
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    • 제46권6호
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    • pp.29-36
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    • 2004
  • In this study, The fatigue properties of the GFRP composite panels of which core was made of the polymer mortar and both facings were reinforced by the high-tensile GFRP were surveyed. Composite-panel specimens consisted of polymer mortar core and GFRP compressive and tensile sides with various thickness were produced for an experimental study. Flexural fatigue tests were conducted to examine the correlation between the fatigue load and the fatigue life for various thickness of core and facings, and its results are presented. The correlation obtained in this study between the fatigue load and the fatigue life for various thickness arc in good agreement with the modified Miner's law.