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Flexural Failure Mechanism of Concrete Beams Strengthened with FRP and Comparing The Result With Classic Method Of Strengthening

Tahsiri, Hamid Reza | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44519 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Retrofitting of reinforced concrete and steel structures is a very important issue in Structural Engineering due to the reasons such as drawbacks in previous codes, revision of application of structures , destructive environmental factors and deficiencies in construction process.
    Strengthening of structures with FRP composites is one of the methods that have been welcomed by researchers due to its unique properties including high tensile strength, light weight, simple application and resistance to corrosive environment. Although the main purpose of retrofitting is to increase the overall load carrying capacity of the structures, the failure mechanism of the strengthened member is also very substantial.15 reinforced concrete beam specimens with the dimensions of 150×250× 2000 mm were cast and subjected to three-point flexural loading to investigate and compare the effects of CFRP strengthening method with the classic strengthening method on their strength and ductility response.These beams were divided into three groups. Three of these 15 specimens were not strengthened. Six of them have been strengthened with CFRP flexural strengthening method and another 6 ones have been strengthened with classic method of strengthening in flexure. 1)First group with the minimum percent of flexural rebars: in strengthened beams by CFRP (first method) an increase of ultimate strength about 30 percent and a decrease of 72 percent in vertical deflection as compared with control beam were seen. Also, in strengthened beams by classic method an increase of 62 percent in ultimate strength and an increase of 72 percent in vertical deflection as compared with control beam were observed. 2)Second group with the normal percent of flexural rebars: in strengthened beams by CFRP (first method) an increase of 32 percent in ultimate strength and a decrease of 62 percent in vertical deflection as compared with control beam were seen. Also, in strengthened beams by classic method an increase of about 59 percent in ultimate strength and an increase of 84 percent in vertical deflection as compared with control beam were observed. 3)Third group with the maximum percent of flexural rebars: in strengthened beams by CFRP (first method) an increase of ultimate strength about 29 percent and an increase of 50 percent in vertical deflection as compared with control beam were seen. Also in strengthened beams by classic method an increase of about 72 percent in ultimate strength and an increase of 26 percent in vertical deflection as compared with control beam were observed.The exact values of these increases and decreases in ultimate strength and ductility, modes of failure and the other results are presented in detail in the text of the thesis
  9. Keywords:
  10. Upgrading ; Concrete Structures ; Fiber Reinforced Polymer (FRP) ; Strengthening Classical Method ; Carbon Fiber Reinforced Polymer (CFRP) ; Flexural Strength ; Reinforcement Concrete Beam

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