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Repairing and Strengthening RC Beams Using CFRP

United Arab Emirates University College of Engineering Industrial Training and Graduation Projects Unit . Graduation Project II Section (52-C). Repairing and Strengthening RC Beams Using CFRP. Submitted to: Dr. Khalil Al Hosani Done By : Amna Zaid Neseebi 200413680

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Repairing and Strengthening RC Beams Using CFRP

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  1. United Arab Emirates University College of Engineering Industrial Training and Graduation Projects Unit Graduation Project II Section (52-C) Repairing and Strengthening RC Beams Using CFRP Submitted to: Dr. Khalil Al Hosani Done By : AmnaZaidNeseebi 200413680 BadreyaSaeed Al Kaabi 200413822 Fatima Ali Al Naqbi 200314568 MunaButti Al Kaabi200309134 Date of submission: 10th Sept. 2009 1st Semester – 2009-2010

  2. Deepest Thanks To:

  3. Outline • Problem Identification • Objectives • Why CFRP ? • Advantages of CFRP • Applications of CFRP • Beam Design • Materials used • Test Results for cylinders • Design Alternatives • Test Results • Conclusions • Recommendations

  4. Problem Identification • Insufficient Reinforcement • Corrosion damage • Change in use • Structural damage • Seismic upgrade 1950’s 2000’s

  5. Objectives The main purpose of this project is to: • Find suitable and efficient materials that will be used in repair and maintenance of damaged and deteriorated structural element of buildings

  6. Why CFRP ? In FRP materials, fibres provide both: • Loading carrying capacity • Stiffness to the composite While the matrix is necessary to: • Ensure sharing of the load among fibres • Protect the fibres themselves from the environment

  7. Advantages of CFRP • Handling and Transportation • Durability and maintenance • Thin strengthening layers • Time of construction • Pre-stressing possibilities • Cost

  8. Applications of CFRP

  9. Beam Design • Maximum load it can carry about 50 kN • Design was done according to ACI code 318-05

  10. Materials Used Design of compressive strength of 30 MPawas used by using ACI-05

  11. Test Results of Cylinders After 7 days After 28 days

  12. Materials Used • CFRP Materials are from BASF Company and they are : • MBrace® Fiber ( Unidirectional carbon fiber sheeting used with resin lay-up method by using MBrace® saturant resin ) • MBrace® Laminate ( Ready to use pultruded carbon fiber laminate used with MBrace® Adhesive 220 )

  13. Design Alternatives

  14. Test Results

  15. Test Results

  16. Test Results

  17. Strength Gain

  18. Ductility Index

  19. Mode of Failure S 1 Control Beam R1 S 2 R2 R3 S 3

  20. Conclusions • This method can be relied on if any face a similar problem. • Different skills have been learnt • Easy to perform and results in significant improvements in ultimate load capacity • The cracking behavior and pattern of both repaired and strengthened beams was similar. • The cracking load of all beams was nearly the same. • The strengthened beams deflected more than repaired beams after yielding of the steel.

  21. Recommendations • More tests are, however, needed to investigate the influence of other parameters such as number of CFRP layers and steel ratio. • The area in need of major attention and possibly, improvement is that of concrete-FRP adhesion. It is necessary to avoid or at least limit the extent of FRP peeling in order to improve the effectiveness of the strengthening and repairing method and the ductility of the load-deflection response.

  22. Questions Time

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