Northwest Arm Drive Bridge Long-term...
Transcript of Northwest Arm Drive Bridge Long-term...
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Northwest Arm Drive BridgeLong-Term Rehabilitation
NEBPP Meeting, September 10, 2019Christopher Dyck, M.Sc., P.Eng.Nova Scotia Transportation and Infrastructre Renewal (NSTIR)
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Northwest Arm Drive BridgesHFX244A & HFX244B
• Built in 1975
• 5 span concrete AASHTO girders (‘I’ shaped Girders)
• 6 girders per span
• Each span approximately 16.6m long
• 83.2m total length
• Supported on concrete hammerhead piers on spread footings
• Pier height ranges from 6m to 10m tall
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Chain of Lakes Trail
HFX244B (NB)
HFX244A (SB)
First Chain Lake (Halifax Water Backup Supply)
Crown DriveHalifax Water Access Rd (gated – goes under bridges)
Halifax Water Spillway (under bridges)
St. Margaret’s Bay Rd
Walter Havill Dr.Northwest Arm Drive
Access to Trail
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HFX244A & HFX244B
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EXISTING GIRDER CONDITIONS
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EXISTING GIRDER CONDITIONS
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EXISTING GIRDER CONDITIONS
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EXISTING PIER CONDITION
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EXISTING PIER CONDITION
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EXISTING DECK & BARRIER
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Northwest Arm Drive Bridges HFX244A & HFX244B
Rehabilitation Approach
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TRADITIONAL REHABILITATION
• Traditional Method and Typical Longevity:
• Bearing Repairs / Replacement (15-20 years?)
• Girder End Repairs (7-10 years?)*
• Diaphragm Repairs (10- 15 years?) *governs
• Deck End Repair (20 years?) life of repairs
• Joint Replacement (5-10 years?)*
• Depends on Multitude of Factors Both During Construction and Afterwards.
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TRADITIONAL REHABILITATION
• 5-10 years maximum before rehabilitation required again.
• Additional traffic delays
• Additional expenditure
• Poor Performance
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PROJECT GOALS• Long Lasting Rehabilitation
• Cost Effective
• Addresses all Concerns with Bridge Condition
• Minimize Traffic Disruption
• Prevent Future Water Damage
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NEW BRIDGE DESIGN MEASURES FOR LONGEVITY
• Integral or Semi-Integral Abutments
• Continuous Girders and deck
• Improved materials and construction practices
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REHABILITATION APPROACH• Trial a new approach to rehabilitating concrete bridges that have
multiple simple spans and expansion joints
• Eliminate all joints in bridge through engineering design
• Integrate all piers with the bridge girders and deck
• Convert abutments to semi-integral
• First application of this approach in Nova Scotia
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PIER INTEGRATION
FROM THIS TO THIS
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SEMI-INTEGRAL ABUTMENTS
FROM THIS
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SEMI-INTEGRAL ABUTMENTS
TO THIS
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PIER INTEGRATION & SEMI-INTEGRAL ABUTMENTS
• Eliminates need to jack and support girders during rehab
• Eliminates the need to replace existing bridge bearings
• Reduces quantity of girder repairs
• Eliminates LEAKING JOINTS
• Improves surface smoothness
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PIER INTEGRATION & SEMI-INTEGRAL ABUTMENTS
• Will lead to a longer lasting repair (perhaps 40 years + with minimal maintenance)
• Minimal increase in cost
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Northwest Arm Drive Bridges HFX244A & HFX244B
Analysis
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Analysis Approach
• Analysis Scope
• To assess the feasibility of joining (integrating) the pier cap with the girders to form a fully continuous bridge
• 16.3 m becomes 83 m+
• Temperature effects become very important
• To determine the load effects on all structures in the bridge as well as their resistances upon integration
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Analysis Approach• Finite Element (FE) Model: Simple vs Continuous Span
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Analysis Approach
• Finite Element (FE) Models:
• Beam and shell models in SFrame
• Simple span model
• Uncracked properties, Dead Loads
• Continuous span model
• Uncracked properties, SLS Cracking check
• Continuous span model
• Cracked properties over pier, Full assessment of load effects
• Pier and footing models – shell models
• Capture settlement effects and new shear and bending effects
• Tangent girders with curved deck
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Analysis Approach• Finite Element (FE) Model:
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Analysis Approach• Finite Element (FE) Model: Concrete Dead Load (Continuous)
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Analysis Approach• Finite Element (FE) Model: Live Load Truck
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Analysis Approach• Finite Element (FE) Model: Transverse Wind Load Bending
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Analysis Approach• Finite Element (FE) Model: Forced Settlement of Piers on
Different Soils
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Northwest Arm Drive Bridges HFX244A & HFX244B
Tendering
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Tendering
• Major effort was put into defining the scope of the work and detailing it:
• 23 detailed drawings
• Full procedures for all repairs
• Extents and boundaries for all key repairs
• First application, so contractors not familiar with new approach
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Tendering• Example of Girder End Repair level of detail:
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Tendering• Example of Girder End Repairs outside integration
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Northwest Arm Drive Bridges HFX244A & HFX244B
Construction
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Crossovers
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Concrete Removal
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Concrete Removal
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Concrete Removal
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Barrier Refacing
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Barrier Refacing
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Barrier Refacing
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Deck Repairs
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Crack Injection
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PIER INTEGRATION
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PIER INTEGRATION
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PIER INTEGRATION
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PIER INTEGRATION
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PIER INTEGRATION
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PIER INTEGRATION
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PIER INTEGRATION
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SEMI-INTEGRAL ABUTMENTS
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SEMI-INTEGRAL ABUTMENTS
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SEMI-INTEGRAL ABUTMENTS
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SEMI-INTEGRAL ABUTMENTS
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SEMI-INTEGRAL ABUTMENTS
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Girder Repairs
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Girder Repairs
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Girder Repairs
FRP
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Northwest Arm Drive Bridges HFX244A & HFX244B
Finished Condition Comparison December 2018
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Girder Repairs + Wrapping
From This:
To This:
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Pier Repairs
From This:
To This:
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Semi-Integral Abutments
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Barrier Repairs
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To This:
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Resurfacing
From This:
To This:
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So why not use this everywhere?• This procedure is broadly applicable
• Applications will need to be carefully chosen
• Traffic maintained in workzone?
• Continuous conversion does not favour lane-by-lane construction
• Design effort is more extensive and complex
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Summary - Life Cycle Cost
• Low bid was Cdn$2.1Million (US$1.6Million) for both bridges
• Significant life cycle cost savings
• Significantly less impact on the public over the remaining life of the structure
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Questions?