Bridge Rehabilitation

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Bridge Rehabilitation

• BSI Bridge site investigation
• Strength Analysis
• Concrete Repairs
• Steel Repairs
• Bridge Decks
• Joint Beam End Modifications
• Integral Semi-integral Conversions
• Widening

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Bridge Site Investigation

• Existing Plans
• Reality
• Man-made changes
• Natural changes

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54-0 per plans, 50-0 actual


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Bridge Rehabilitation Existing Bridge Structural
Requirements

• Strength
• Bridge Design Manual HS-20 with 60 psf FWS
• As scoped
• Generally HS-25 with 60 psf FWS, especially for
  mainline bridges
• HS-20 may be accepted
• Fatigue
• New policy pending

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Existing Bridge Structural Requirements Fatigue
Analysis
Method B
Method A
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Bridge Rehabilitation Submittal
RequirementsStructure Type Study

• Fatigue and/or load evaluation (if scoped)
• Color photographs
• Summary of field investigation
• Preliminary rehab details

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Bridge Rehabilitation Concrete Repair

• Item 519 Concrete Patching
• Item 520 Pnuematically placed mortar
• Item Special Shotcreting Concrete Structures
• Trowelable mortar

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Concrete RepairThick, formable, and structural
patches

• Item 519 Concrete Patching
• Formed and poured
• Repair depth 3 inches or greater
• Best choice if applicable
• Abutment pier seats, curbs, sidewalks, parapet
  tops

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Concrete RepairThin patches

• Item 520 Pnuematically placed mortar
• Repair depth 3 inches or less
• Applied with spray equipment
• Recommended for between 150 and 350 sq. ft.

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Concrete RepairThin patches

• Item Special - Shotcreting concrete structures
• Repair depth 3 inches or less
• Recommended for greater than 350 sq. ft.
• Stringent testing and performance specs.

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Concrete RepairThin patches

• Item Special Trowelable mortar
• Supplemental Specification 843
• Repair depth 3 inches or less
• Recommended for less than 150 sq. ft.

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Concrete Repair
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Concrete RepairGeneral Recommendations

• Use sounding and not visual
• Perform sounding close to sale date
• Use plan quantity 2 to 3 times sounded area, more
  if not close to sale date
• Do not patch deck bottoms over traveled lanes
• Consider concrete removal and use of solvent free
  epoxy resin and urethane topcoat if area is not
  visible to public

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Concrete Repair Summary of Total Common
Concrete Repair Quantities 2002-2004

• Patching Concrete Structures 268,128
  S.F.
• Pnuematically Placed Mortar/
• Shotcreting Concrete Structures 11,629
  S.F.
• Patching Concrete Structures with Trowelable
  Mortar
• 
  
  27,466 S.F.

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Bridge Rehabilitation Steel Repairs Fatigue
Issues
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Bridge Rehabilitation Steel Repairs Fatigue
Issues

• Problem ? Solution
• Stress induced fatigue crack
• Distortion induced fatigue crack

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Bridge Rehabilitation Steel Repairs Fatigue
IssuesStress Induced Fatigue
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Bridge Rehabilitation Steel Repairs Fatigue
Issues
Stress Induced Fatigue
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Bridge Rehabilitation Steel Repairs Fatigue
IssuesDistortion Induced Fatigue
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Bridge Rehabilitation Steel Repairs Fatigue
Issues
Distortion Induced Fatigue
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Bridge Rehabilitation Steel Repairs Fatigue
Issues
Distortion Induced Fatigue
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Bridge Rehabilitation Steel Repairs Fatigue
Repairs
Solution A Free it up
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Bridge Rehabilitation Steel Repairs Fatigue
Repairs
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Steel Repairs Fatigue Repairs
Solution B Lock it up
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Bridge Rehabilitation Fatigue Repairs
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Bridge Rehabilitation Bridge Decks

• Closure pours construction joints
• Haunch issues

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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
Crossframes welded later
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Bridge Rehabilitation Bridge Decks Closure
Pours
Crossframes welded later
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
Release crossframes
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Bridge Rehabilitation Bridge Decks Closure
Pours
Release crossframes
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Rehabilitation Bridge Decks Closure
Pours
Reinstall crossframes
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Bridge Rehabilitation Bridge Decks Closure
Pours
The closure pour may be eliminated for this
condition if the designer can show that the
outside existing member, now being attached to
the new member, is not restrained from returning
to its original unloaded position by the new
cross frames (designated D1in Figure 409-D).
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Bridge Rehabilitation Bridge Decks Closure
Pours
Closure pours may be eliminated if the
differential deflection is expected to be less
than ¼ inch regardless of superstructure type.
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Bridge Rehabilitation Bridge Decks Closure
Pours
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Bridge Decks Cut Lines
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Bridge Decks Profile Issues

• Survey of Existing Beams Required by the BDM
• Give clear instructions to surveyors

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Bridge Decks Profile Issues

• Maximum haunch 12 inches
• Reinforce haunch if 5 inches
• Use 9 inch wide haunch

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Bridge Decks Profile Issues
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Bridge Rehabilitation Beam Ends and Deck Joints
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Bridge Rehabilitation Jointless Conversions
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Integral Conversion
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Integral Conversion
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Jointless Conversions
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Jointless Conversions
After
Before
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Jointless Conversions
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Jointless Conversions
Bridge Plan View
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Bridge Rehabilitation Widening Issues
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409.5 PIER COLUMNS New pier columns added for
the purpose of widening shall be tied into the
existing pier if the pier type is cap and column.
Individual freestanding columns are not
permitted. When the existing piers are either
T-type or wall-type piers, the designer should
evaluate whether the new individual column should
be tied back into the existing substructure unit
or remain free standing. Two or more adjacent
freestanding individual columns without a cap are
not permitted.
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Bridge Rehabilitation Widening Sheeting and
Shoring
Plan Design Required if height 8 feet
Two PE Stamps Required
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Bridge Rehabilitation Widening Sheeting and
Shoring
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Bridge Rehabilitation Widening Sheeting and
Shoring
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Sheeting and Shoring
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Bridge Rehabilitation Widening Sheeting and
Shoring
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Bridge Rehabilitation Widening Sheeting and
Shoring
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Bridge Rehabilitation Widening Sheeting and
Shoring
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Questions ???