3d modeling applications for the croix river crossing project 3d... · 3d modeling applications for...
TRANSCRIPT
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3D Modeling Applications for the St. Croix River Crossing Project
3D Design and Modeling for Highway Structures Conference
April 14, 2015
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Presentation Overview
• Project Background• Extradosed Structure 101• Schedule• 3D Model Development and Usage
• Design Aid• Visual Quality• Public Involvement• 4D Schedule
• Current Construction Status
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St. Croix Crossing Project Area
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Project Background ‐ History
• SFEIS identified several important areas of concern for design:• visibility of bridge• height of towers• number of piers in the river • the effects of the piers on the natural environment, wildlife, aquatic life, MN
wetlands, and the WS bluffs• An extradosed solution was identified as the Preferred Alternative bridge type
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The New St. Croix Crossing
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The New St. Croix Crossing
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The New St. Croix Crossing
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Roadway View
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Extradosed Bridges
• Relatively new bridge form – 1988 France
• First was constructed in Japan in 1994
• More than 100 worldwide, mostly in Japan
• Very new form to North America
• Selected to address specific site constraints
• Similar to cable stay and segmental box
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Extradosed Bridges
Pearl Harbor Memorial ‐ New Haven, CT First in United States515’ (157 m) main span – under construction
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Extradosed Bridges
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Schedule
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3D Model Development and Usage
• Started with original model developed in preliminary and conceptual design phase
• 3D Studio Max
• Model Usage – integrated effort– Optimization Efforts and Design Aid
– Visual Quality – Renderings and VQ Committee
– Public Involvement – Photo‐Simulations and Fly‐Thru
– 4D Schedule
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Design Optimization
• Baseline 450’ Spans• 7 extradosed piers, 6 in water
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Design Optimization
• Spans increased from 480' to 600'• Elimination of two extradosed piers• 5 extradosed piers, all in water • Conventional pier on WS bluff slope
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Design Optimization
• Blue – Original Layout• Red – Optimized Layout
• Adjustment of Roadway Alignment• Improved Bridge Drainage System • Reduced Complexity of Extradosd End Span
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Optimization ‐ Towers
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3D Model ‐ Crossbeam
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4D Schedule
• Utilized 3D Studio Max Model and Synchro
• Early Foundation
• Full Bridge
• Wisconsin Bluff
• Tower Vignette
• Contractors Schedule Review
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3D Model Development and Usage
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3D Model Development and Usage
– Insert models from 3D Studio Max
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Construction Sequencing
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4D Schedule ‐ Early Foundation
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4D Schedule ‐ Full Bridge
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4D Schedule ‐Wisconsin Bluff
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4D Schedule ‐ Tower Vignette
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4D Schedule ‐ Contractors Schedule
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Early Foundations
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Early Foundations
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Current Construction
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Segment Dimensions
Approach Segments• Width of 45’ / Depth 10’ to 14’• 338 Segments – weight 90 to 120 tons
River Span Segments• Width of 50’ /Depth 18’• 656 Segments – weight 140 to 180 tons
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Questions?
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Project Background ‐ History
The extradosed form would:
• Maximize spans without overpowering the natural setting of the lower St. Croix with tall towers
• Minimize the footprint in the river, the MN wetlands, and on the WS bluff
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Visual Quality
Signature BridgeCommunity Involvement – Visual Quality Advisory Committee
• Visual Quality Manual (2007)• Visual Quality Manual Addendum (2011)• VQAC Meetings During Design Phase (2012)
Design Phase Visual Refinements• Maintain Architectural Intent
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Visual Quality
• An "organic" theme was identified
• Parts intended to look as if they were "found in nature", or "shaped by natural forces”
• Vertical pier forms are "reed‐like"
• Girders rounded and tapered "like bones or tree branches"
• Transitions are gradual and smooth
• These commitments set the aesthetic direction
• All design issues were vetted to ensure that the design stayed true to the final EIS and mitigation commitments
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Cable Stay Bridge
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Cable Stay Bridge
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Segmental Box Bridge
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Segmental Box Bridge
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Extradosed Bridges
North Arm Bridge – Vancouver, BC First in North America590’ (180m) main span ‐ 2008
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Design Optimization
• Goal was a single structural unit • Avoid in span joints• Avoid sliding the deck at end extradosed piers• Twin leg piers for flexibility• Serviceability for time dependence and thermal effects