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Numerical Analysis of FRP Strengthened Beam with Lingitudinal Grooves

Samea, Parham | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 43043 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Mostofinejad, Davood
  7. Abstract:
  8. Strengthening and rehabilitation of concrete structures significantly became a dynamic construction field of activity through the years. Strengthening concrete structures by means of fiber reinforced polymers (FRP) plates or sheets over the tensile face of flexural members is stated to be an effective rehabilitation technique. Numerous studies have been carried out over the years, taking into account the FRP strengthening methods. In this regards, premature failures induced as a result of composite plate de-bonding is of great importance in such members.
    In a reinforced concrete beam de-bonding may be induced by a major flexural crack in the mid-span.
    Loading of a FRP strengthened reinforced concrete beam will lead to the formation of flexural/shear cracks along the span. When loading is increased, the flexural cracks will tend to propagate upwards but crack opening at the bottom is resisted by the FRP plate.
    A major issue of concern in flexural strengthening of reinforced concrete beams with FRP laminates is their de-bonding off the concrete substrate, which leads to premature failure of the structural member thus strengthened. Premature de-bonding may be induced as a result of weak surface conditions on the concrete-FRP contact regions.
    Recently a method of surface preparation has been investigated to develop a substitute method for conventional surface preparation methods called grooving method. This method suggests a few grooves along the tensile side of the concrete to increase the contact area between FRP and the concrete. This study explores a finite element analysis for bonding behavior of a beam reinforced by the new developed FRP strengthened method
  9. Keywords:
  10. Finite Element Method ; Fiber Reinforced Polymer (FRP) ; Debonding ; Grooving Method

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