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Tensile Behavior and Fracture Properties of Ductile Hybrid FRP Reinforcing Bar for Concrete Reinforcement

콘크리트 보강용 고연성 하이브리드 FRP 보강근의 인장 및 파괴 특성

  • 박찬기 (건국대학교 대학원 지역건설환경공학과) ;
  • 원종필 (건국대학교 지역건설환경공학과)
  • Published : 2004.01.01

Abstract

FRP re-bar in concrete structures could be used as a substitute of steel re-bars for that cases in which aggressive environment produce high steel corrosion, or lightweight is an important design factor, or transportation cost increase significantly with the weight of the materials. But FRP fibers have only linearly elastic stress-strain behavior; whereas, steel re-bar has linear elastic behavior up to the yield point followed by large plastic deformation and strain hardening. Thus, the current FRP re-bars are not suitable concrete reinforcement where a large amount of plastic deformation prior to collapse is required. The main objectives of this study in to evaluate the tensile behavior and the fracture mode of hybrid FRP re-bar. Fracture mode of hybrid FRP re-bar is unique. The only feature common to the failure of the hybrid FRP re-bars and the composite is the random fiber fracture and multilevel fracture of sleeve fibers, and the resin laceration behavior in both the sleeve and the core areas. Also, the result of the tensile and interlaminar shear stress test results of hybrid FRP re-bar can provide its excellent tensile strength-strain and interlaminar stress-strain behavior.

Keywords

References

  1. ACI. 2000. "Guide for the Design and Construction of Concrete Reinforced with FRP bars", American Concrete Institute Committee 440.
  2. ASTM D 4475. 1996. "Standard Test Method for Apparent Horizontal Shear Strength of Pultruted Reinforced Plastic Rods By The Short Beam Method", November
  3. Bakis, C. E., and Terosky, J. A. 1996. "Smart Pseudo-Ductile, Reinforcing Rods for Concrete: Manufacture and Test", Proc. 1st Int. Conf. On Composites in Infrastructures, ICCI 96, Tucson, Arizona: 95-108.
  4. Hearle, J. W., Grosberg, P. and Backer, S. 1969. "Structural mechanics of fibers, yarns and fabrics", John-wiley-interscience, New York.
  5. Humphreys, E. A. 1993. "Properties Analysis of Laminates", Engineered Materials Handbook, Vol. 1: Composites, ASTM International. 218-235
  6. Jiang, C. 1998. "Manufactureing and Process Modeling of FRP re-bars By A Combind Pultrusion/Filament Winding Process", M. S. Thesis, University of Missouri-Rolla. USA
  7. Krishnamoorthy, P. k., Belarbi, A, Chandrashekhara, K., and Watkins, S. 1998. "Hybrid Composite re-bars for Smart Concrete Structure", Proceeding of SPIE Smart Structures and Materials Conference, Vol.3043, March. 65-71
  8. Nanni, A. 1993. "Fiber-Reinforced Plastics (FRP) Reinforcement for Concrete Structures Properties and Applications", Elsevier Pub. Co. Inc., NY: 167-188.
  9. Rosen, W. B. 1965. "Mechanics of Composites Strengthening", Fibre Composite Materials, ASTM, Metals Park, Ohio
  10. Smith, B. W. 1993) "Fractography for Continuous Fiber Composites", Engineered Materials Handbook, Vol. 1: Composites, ASTM International. 787-793
  11. Tamuzs V., and Tepfers, R. 1995. "Ductility of Non-Metallic Hybrid Fiber Composite Reinforcement for Concrete", Proceeding of the Second International RILEM Symposium, Ghent, Belgium, August. 18-25
  12. Zweben, C.. Rosen, B. W. 1970. "A Statistical Theory of Material Strength with Application to Composite Materials", Journal of Mechanics Physics Solids, Vol. 18 189-206 https://doi.org/10.1016/0022-5096(70)90023-2