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What are the various methods for “Rehabilitation” and “Repair” of bridges?

Let us first understand what exactly we mean by “Rehabilitation” & “Repair”

Rehabilitation: the process of restoring the bridge to original service condition.

Repair: the technical aspect of rehabilitation; action taken to correct damage or deterioration on a structure or element to restore it to original condition.

Common approaches include either one or more of the following:

Reduction of dead load:

By removing an existing heavier deck & replacing it by lightweight decks such as :

    • Open-Grid steel decks
    • Exodermic deck
    • Laminated timber deck
    • Lightweight concrete deck
    • Aluminium/steel orthotropic steel deck

Introducing composite action:

Modification of an existing stringer & deck system to a composite system is a common method for increasing the flexural strength of bridge.

Improving the strength of various bridge members:

The common measures include:

    • Addition of Steel Cover Plates
    • External shear reinforcement for concrete, steel & timber beams
    • Adding Lateral Supports or Stiffeners
    • Epoxy Injection
    • Rebar Injection
    • Jacketing of timber/concrete Piles & Pier columns
    • Post-Tensioning various bridge components

Developing additional bridge continuity:

The common measures include:

    • Addition of supplemental supports
    • Modification of simple spans : Simply Supported adjacent spans are connected together with a moment & shear-type connection

Recent developments:

    • Epoxy bonded steel plates
    • CFRP Plate strengthening

Note: We have confined ourselves to general measures to be adopted for Super Structure & not discussed specialized problems of other components (like expansion joints & bearings)

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Question by: Mr C.P.Reddy

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