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Rte. 123 Bridge over Occoquan RiverFairfax and Prince William Counties, Virginia
Rte. 123 Bridge over Occoquan RiverFairfax and Prince William Counties, Virginia
m o f f a t t & n i c h o l
T. Michael Harris, P.E.Moffatt & Nichol
Richmond, Virginia
Creative People – Practical Solutions
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Rte. 123 Bridge over the Occoquan RiverRte. 123 Bridge over the Occoquan RiverProject Background
LocationSite CharacteristicsBridge Requirements
Concept DevelopmentPublic InvolvementAesthetics
Final Bridge DesignSubstructure Superstructure
ConstructionConclusion
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Project BackgroundProject BackgroundLocation
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Project BackgroundProject BackgroundTown of Occoquan
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Project BackgroundProject BackgroundTown of Occoquan
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Project BackgroundProject BackgroundSite Characteristics
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Project BackgroundProject BackgroundExisting Bridge
10 Spans – 120’ Steel Plate Girders3 Traffic Lanes (1 NBL & 2 SBL)Functionally ObsoleteSpans Mill St., Parking Lot & Occoquan River
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentProposed Bridge Requirements
7 Traffic Lanes (3 NBL, 3 SBL & 1 SBL Turn)Appropriate Shoulder Widths for SafetyPedestrian WalkwayRaise Profile of the Roadway and BridgeUse Existing Bridge Alignment & ROWParking Area during and after construction Functional and Economical Bridge SolutionApproval of Bridge Concept by Town
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentConcept Study
Bridge Selection CommitteeCitizens and Elected Officials from Town of Occoquan, Fairfax and Prince William CountiesProvide community input into the bridge selection process
Public Involvement
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept Development
EducationBridge TypesPurpose & ApplicationsCost
Public Involvement
Bridge Type Avg. Cost / SFSuspension &
Cable Stay $325
Tied-Arch $275
Classical Arch $225
Modern Arch $175
Box Girder $155
Girder $95
Road
way
/ RO
WG
eom
etric
Hyd
raul
icCo
ncer
nsV
ertic
alCl
eara
nce
MO
T &
Sta
ged
Cons
truct
ion
Aes
thet
icCo
nsid
erat
ions
Proj
ect C
ost
LEGEND
Very Good Good Acceptable Poor Very Poor
LEGEND
Very Good Good Acceptable Poor Very Poor
Evaluation SummaryEvaluation Summary
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentPublic Involvement
Approved Bridge Concept
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentPublic Involvement
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentPublic Involvement
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentPublic Involvement
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentBrickwork Formliners
Bases of Pier ColumnsBase of Abutment A MSE Wall
VDOT
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentFractured Rib Formliners
Faces of Pier ColumnsFaces of MSE Wall Panels
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Concept DevelopmentConcept DevelopmentPedestrian Walkway
Recessed PanelsPedestals with LightingFRP Railing Panels
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignSequence of Construction
Stage I Construction
Stage II Construction
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignSummary of Concrete Strengths
Beams and Beam SegmentsDeck SlabParapets, Medians & Railing PedestalsPier Caps & ColumnsPier FootingsAbutments & MSE walls
55 MPa (8,000 psi)40 MPa (5,800 psi)30 MPa (4,300 psi)35 MPa (5,100 psi)25 MPa (3,600 psi)25 MPa (3,600 psi)
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignSummary of Reinforcing Steel
All mild reinforcing steel – ASTM A615 Gr. 60MMFX 2 (Stage II Deck Slab Only) -
ASTM A615 Gr. 75
Prestressing Steel - 0.6” ø, Low-RelaxationASTM A416 Gr. 270
Post-tensioning Steel - 0.6” ø, Low-RelaxationASTM A416 Gr. 270
420 MPa (60 ksi)
520 MPa (75 ksi)
1860 MPa (270 ksi)
1860 MPa (270 ksi)
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignAbutments
Single Row of Steel PilesSocketed into RockMSE Walls
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignMSE Walls
Support of Abutment FillsRetaining Wall for SBL Approach
Support for Roadway Fill (Rte 123 & Rte 722)
Reduced ROWGreater than 350’ long (107 m)Maximum Height of 43.5’ (13.25 m)
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignPiers
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignPiers
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignDeck Slab
8.5” (220mm) Slab ThicknessEpoxy Coated Reinforcing Steel (SBL)MMFX 2 Reinforcing Steel (NBL)
VDOT
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignApproach Spans – (144’-4” Each)
Pier 2Pier 1 Pier 3Abut. A
Span A
Pier 4
Span B Span C Span D
4 Simple Spans – 140’ (42.7m) eachMade Continuous for Live Load
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignMain Span Unit – (180’-240’-180’)
Pier 4 Pier 5 Pier 6 Abut. B
End Segment Haunch SegmentDrop-In SegmentHaunch Segment End Segment
2 End Segments – 128’ (39m) each
2 Haunch Segments – 98’ (30m) each
1 Drop-In Segment – 137’ (41.8m)
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignAnalysis and Design Software
Consplice PT by LEAP SoftwareGirder Line AnalysisTime Dependent Analysis
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignGirder Section
Approach SpansStandard VDOT 77” Bulb-T (PCBT-77)
Main Span UnitModified PCBT-77
2” added to top flange thickness(from 4” to 6” thick)
2” added to overall section width(from 7” web to 9” web)
Modified PCBT-77
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignPost-Tensioning Tendons
3 Tendons (T1, T2 & T3)12 – 0.6” Diameter Strands Per Tendon
T1T2T3
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignPost-Tensioning Ducts
3” Diameter HDPE Round Ducts6” (150mm) Vertical Duct Spacing
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignEnd Segment End Block
2310mm 915mm
392mm
560mm
265mm
T1
T2
T3
End Block Elevation
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignHaunch Segments
Variable Web DepthConstant Bottom Bulb ThicknessOverall Depth Varies from 6.58’ (2007mm) to 12.5’(3810mm)
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignGirder Splices
2’ (600mm) Splice LengthLapped & Interlocking Reinforcing SteelWelded Steel Plates
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignGirder Splices
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignErection Sequence
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
Final Bridge DesignFinal Bridge DesignErection Sequence
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionSequence of Construction
Eliminate Stage I Demolition of Existing Fascia GirderNon-Parallel Bridges
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionTransverse Deck Cracking
Full Depth Shrinkage CracksFull Width Cracks Spaced at 3’-10’Extent of Cracking Varies with Span Location
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionSealing of Post-Tensioning Ducts
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments – Casting Yard
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments - Testing
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments –
Impact of Duct Size
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Beam Segments – Re-Cast
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConstructionConstructionWeb Cracking of Approach Girders
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConclusionConclusionNotable and Innovative Features
High Strength Concrete in SuperstructureSpliced and Post-tensioned Bulb-T Girder SegmentsMMFX2 Reinforcing Steel (NBL Deck)FRP RailingsPublic InvolvementCost Effective Aesthetic Features
Formliners for RusticationRecessed PanelsStamped Concrete
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Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConclusionConclusionApplication of state-of-the-art technology with cost effective architectural enhancements to provide a bridge structure that meets requirements of function and overall aesthetic goals.
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConclusionConclusionComparison
Rte. 123 Bridge over the Occoquan RiverVirginia Concrete Conference 2007
ConclusionConclusionComparison