Repair and Strengthening of

shootperchUrban and Civil

Nov 26, 2013 (3 years and 6 months ago)

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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.



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

Automated
winding

Bonding of
prefabricated shells

Resin infusion

Use of composite
cables/strips

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