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Strengthening Reinforced Concrete Deep Beams Using FRP Systems

Mesgarian, Iman | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 39276 (53)
  4. University: Sharif University of Technology International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. In recent years, the development of the plate bonding repair technique has been shown to be applicable to many existing strengthening problems in the building industry. This technique may be defined as one in which composite sheets or plates of relatively small thickness are bonded with an epoxy adhesive to, in most cases, a concrete structure to improve its structural behaviour and strength. The sheets or plates do not require much space and give a composite action between the adherents. The old structure and the new bonded-on material create a new structural element that has a higher strength and stiffness than original one. According to the available methods of analysis and design for reinforced concrete deep beams, addition of web reinforcement beyond the minimum amount provides only a marginal strength gain, if it does at all. This casts serious doubts on the feasibility and extent of strengthening by placing external reinforcement in the web, whenever such a need arises. This study therefore explores the prospect of strengthening structurally deficient deep beams by using an externally bonded fiber reinforced polymer (FRP) system. Six identical beams were fabricated and tested to failure for this purpose. One of these beams was tested in its virgin condition to serve as reference, while the remaining five beams were tested after being strengthened using carbon fiber wrap, glass fiber wrap and carbon fiber laminate. The results of these tests are presented and discussed in the last section. Test results have shown that the use of a bonded FRP system leads to a much slower growth of the critical diagonal cracks and enhances the load-carrying capacity of the beam to a level quite sufficient to meet most of the practical upgrading requirements
  9. Keywords:
  10. Fiber Reinforced Polymer (FRP) ; Fiber Reinforced Plastic (FRP) ; Shear Strength ; Reinforced Concrete Deep Beams ; Debonding

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