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Accelerated Bridge Construction Segmented Deck Replacement, Gilford NH. Lifting Analysis per PCI . Finite Element Modeling and Analysis. Characteristics: 76’ Span Length 49’ Deck Width 23° Skew 7 – W36x194 Girders Considerations: Sound Superstructure Degraded Deck High Traffic Volume. - PowerPoint PPT Presentation
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Accelerated Bridge ConstructionSegmented Deck Replacement, Gilford NH
Characteristics:• 76’ Span Length• 49’ Deck Width• 23° Skew• 7 – W36x194 GirdersConsiderations:• Sound Superstructure• Degraded Deck• High Traffic Volume
← Laconia
Gilford →
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Project ConceptsUse precast, prestressed, full depth deck panels to rapidly replace bridge deck while minimizing local impact due to
construction
• 60 hour closure period• Use existing ramps for rotary traffic control
• Prefabricated full depth, full width deck slabs with centerline crown
• Handling and transportation of full width bridge slabs
• Surveying of existing girder vertical profiles• Field analysis to determine leveling device settings• Accelerated placement of deck panels using transverse
shear joints, polymer sealant, and post tensioning rods
Finite Element Modeling and Analysis
Field Analysis and Construction Program
Laboratory Testing
4 panels, 25’ span laboratory modelfor method verification and proof of concept
Finite element model for determination of expected load distribution to leveling devices
Support 1 Measured Elevation 28 1/8 28.125 inSurvey Point 1 Measured Elevation 28 9/16 28.5625 inSurvey Point 2 Measured Elevation 28 15/16 28.9375 inSurvey Point 3 Measured Elevation 28 7/8 28.875 inSurvey Point 4 Measured Elevation 28 7/16 28.4375 inSupport 2 Measured Elevation 27 7/8 27.875 inLVDT Position 0 0.7481 0.7481 in
- - - - -Support 1 Measured Elevation 27 3/4 27.75 inSurvey Point 1 Measured Elevation 28 1/4 28.25 inSurvey Point 2 Measured Elevation 28 1/2 28.5 inSurvey Point 3 Measured Elevation 28 7/16 28.4375 inSurvey Point 4 Measured Elevation 28 0 28 inSupport 2 Measured Elevation 27 3/8 27.375 inLVDT Position 0 0.7274 0.7274 in- - - - -Support 1 Measured Elevation 28 3/8 28.375 inSurvey Point 1 Measured Elevation 28 3/4 28.75 inSurvey Point 2 Measured Elevation 29 0 29 inSurvey Point 3 Measured Elevation 28 11/16 28.6875 inSurvey Point 4 Measured Elevation 28 1/8 28.125 inSupport 2 Measured Elevation 27 5/16 27.3125 inLVDT Position 1 0.05 1.05 in
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Gird
er A
Gird
er B
Gird
er C
Simplified field analysis program for the determination of leveling device lengths based on existing girder conditions
Advisor: Dr. Charles GoodspeedBy: Anabelle Allen and Carter Terry
Lifting Analysis per PCI
Transportation Analysis
Finite Element Modeling and Analysis
Lifting from 8 points 49’ slab with 23° skew and 2% crown
Use steel frame to support slab on truck with shims to account for crown and deflection of the steel frame under dead load
Lab model of Gilford Bridge slabs -81” x 12.5” x 1.25” -23° skew -2% crown
Fiber Reinforced Plastics (FRP) will be used in full size slabs