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Repair and Strengthening of Bridges and other Structures

Repair and Strengthening of Bridges and other Structures . Examples of Repair Methods. Masonry structures: Pinning for arch ring separation, concrete fill of spandrel walls, crack injection, etc. Concrete structures: Surface protection, protection of steel reinforcement, etc.

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Repair and Strengthening of Bridges and other Structures

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  1. Repair and Strengthening of Bridges and other Structures

  2. Examples of Repair Methods • Masonry structures: Pinning for arch ring separation, concrete fill of spandrel walls, crack injection, etc. • Concrete structures: Surface protection, protection of steel reinforcement, etc. • Steel structures: repair of corrosion, cracks, distortion, etc. • Wrought and cast iron: stiffening, stitching, etc.

  3. Masonry structures Nagasaki Meganebashi (Japan) Pont du Gard (France) Royal Border Rail Bridge (UK)

  4. Masonry pinning

  5. Tying of longitudinal cracks in arch ring

  6. Mass concrete/ reinforced earth fill of spandrel walls

  7. Grouted fill of spandrel walls

  8. Crack injection system

  9. Epoxy Injection

  10. Typical hand-applied concrete repairs

  11. Application of fluid concrete to a beam element

  12. Plan on column to be repaired

  13. Strengthening Methods • Steel plate bonding • External post-tensioning • Composite plate bonding • FRP (CFRP) wraps

  14. Typical plate bonding application

  15. Shear stress distribution in a steel plated RC beam

  16. Peeling failure of a plated RC beam

  17. Strengthening of RC slab with steel plates

  18. Providing continuity in plates

  19. Working platform and support system for plate bonding

  20. Alternative plate bonding solutions

  21. Example of strengthening with external post-tensioning (1)

  22. Example of strengthening with external post-tensioning (2)

  23. Example of strengthening with external post-tensioning (3)

  24. Examples post-tensioning of trusses

  25. Example of FRP application on a RC beam

  26. Comparison of stress-strain characteristics of steel and carbon

  27. Fiber-reinforced Polymer (FRP) Composites

  28. Advantages of FRP

  29. Role of FRP in Rehabilitation

  30. FRP StrengtheningMethods

  31. FRP Strengthening Methods (1)

  32. FRP Strengthening Methods (2)

  33. Mode of failure of beams

  34. Example of FRP application on a RC column

  35. Application methods of FRP wraps to columns Wrapping of fabric Winding of strips Use of composite cables/strips Bonding of prefabricated shells Automated winding Resin infusion

  36. Installation of laminates to the soffit of RC bridge decks

  37. Wrapping of a CFRP fabric to a circular column

  38. Applying FRP strip on RC beam

  39. CFRP shear reinforcement

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