Flexural Behavior of Concrete Beams Strengthened by Classical Method and Comparing The Results with Strengthening by FRP

Moradkhani Pour, Behnam | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45402 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Retrofitting and strengthening existing structures is one of the most important concepts of structural and earthquake engineering. Strengthening of structures could be due to changes in application and applied load, errors in calculation, mistakes in construction, weakness of old codes, structural height increases and changes in environmental conditions. Different methods for increasing the flexural strength and ductility of reinforced concrete beams, as one of the major structural components, have been presented. This research presents an experimental study on the strengthening of reinforced concrete beams by reinforced concrete jackets (classical method) and Fiber Reinforced Polymer (FRP) jackets.
    Reinforced concrete jackets typically increase dimensions of the cross section to provide more flexural and shear strength. Since this mechanism will reduce the available space and story height, this method is not architecturally desirable. However, it is an economical method to strengthen structures without architecture restrictions. FRP jackets are highly considered due to advanced FRP characteristics such as: durability, high tensile strength, magnetic permeability, low thickness, easy application, low density, feasible transportations and negligible changes in dimensions of structures.
    In this study, Fifteen 150x250x2000 (mm) reinforced concrete beams are tested. These beams fall into 3 categories based on the amount of tensile rebars and are strengthened with both reinforced concrete and FRP jackets. A three point flexural test is applied to generate the failure mechanism and load displacement relationship of beams at mid span.
    The experimental results present an enhancement in flexural strength and ductility of retrofitted beams with either method. The improvement is more considerable in beams strengthened with reinforced concrete jackets. However, reinforced concrete jackets are economically reasonable, difficult application and architectural aspects are its disadvantages.
    Presented research provides the experimental results of flexural strength, ductility and failure mechanism of beams and a consistent comparison between two strengthening methods
  9. Keywords:
  10. Retrofiting ; Flexural Strength ; Fiber Reinforced Polymer (FRP) ; Reinforcement Concrete Beam ; Reinforced Concrete Jacket

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