Repair and Strengthening of Bridges and other Structure

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Repair and Strengthening of Bridges and other
Structures
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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.

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Masonry structures
Nagasaki Meganebashi (Japan)
Pont du Gard (France)
Royal Border Rail Bridge (UK)
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Masonry pinning
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Tying of longitudinal cracks in arch ring
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Mass concrete/ reinforced earth fill of spandrel
walls
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Grouted fill of spandrel walls
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Crack injection system
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Epoxy Injection
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Typical hand-applied concrete repairs
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Application of fluid concrete to a beam element
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Plan on column to be repaired
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Strengthening Methods

• Steel plate bonding
• External post-tensioning
• Composite plate bonding
• FRP (CFRP) wraps

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Typical plate bonding application
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Shear stress distribution in a steel plated RC
beam
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Peeling failure of a plated RC beam
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Strengthening of RC slab with steel plates
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Providing continuity in plates
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Working platform and support system for plate
bonding
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Alternative plate bonding solutions
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Example of strengthening with external
post-tensioning (1)
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Example of strengthening with external
post-tensioning (2)
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Example of strengthening with external
post-tensioning (3)
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Examples post-tensioning of trusses
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Example of FRP application on a RC beam
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Comparison of stress-strain characteristics of
steel and carbon
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Fiber-reinforced Polymer (FRP) Composites
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Advantages of FRP
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Role of FRP in Rehabilitation
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FRP Strengthening Methods
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FRP Strengthening Methods (1)
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FRP Strengthening Methods (2)
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(No Transcript)
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Mode of failure of beams
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Example of FRP application on a RC column
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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
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Installation of laminates to the soffit of RC
bridge decks
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Wrapping of a CFRP fabric to a circular column
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Applying FRP strip on RC beam
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CFRP shear reinforcement