Repair and Strengthening of Concrete Bridges and other Structures

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Presentation transcript:

Repair and Strengthening of Concrete 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. Steel structures: repair of corrosion, cracks, distortion, etc. Wrought and cast iron: stiffening, stitching, etc.

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

Masonry pinning

Tying of longitudinal cracks in arch ring

Mass concrete/ reinforced earth fill of spandrel walls

Grouted fill of spandrel walls

Crack injection system

Epoxy Injection

Typical hand-applied concrete repairs

Application of fluid concrete to a beam element

Plan on column to be repaired

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

Typical plate bonding application

Shear stress distribution in a steel plated RC beam

Peeling failure of a plated RC beam

Strengthening of RC slab with steel plates

Providing continuity in plates

Working platform and support system for plate bonding

Alternative plate bonding solutions

Example of strengthening with external post-tensioning (1)

Example of strengthening with external post-tensioning (2)

Example of strengthening with external post-tensioning (3)

Examples post-tensioning of trusses

Example of FRP application on a RC beam

Comparison of stress-strain characteristics of steel and carbon

Fiber-reinforced Polymer (FRP) Composites

Advantages of FRP

Role of FRP in Rehabilitation

FRP Strengthening Methods

FRP Strengthening Methods (1)

FRP Strengthening Methods (2)

Mode of failure of beams

Example of FRP application on a RC column

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

Installation of laminates to the soffit of RC bridge decks

Wrapping of a CFRP fabric to a circular column

Applying FRP strip on RC beam

CFRP shear reinforcement