Lake Champlain Replacement Alternatives - Matrix Analysis

Conventional Bridge Types Signature Bridge Types

Segmental Bridge Long-Span Steel Steel Composite Cable-Stayed Bridge Concrete Extradosed Bridge Network Tied Modified Network Tied Arch Bridge (Cast-In-Place or Precast)

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Similar to the Network Tied Arch, the main channel Conventional two tower cable-stayed bridge with a span is a basket handle arch with a network cable Precast, post-tensioned single cell segmental box Similar to a cable-stayed bridge but using a stiff, deep The main channel span is a basket handle arch with a Combination of haunched (main span) and uniform steel composite superstructure comprised of steel arrangement and internally redundant box tie girders girder built in balanced cantilever; variable depth for concrete superstructure and low towers. network cable arrangement and internally redundant depth (approaches) steel plate or twin trapezoidal HPS edge girder with floorbeams framing supporting supporting a composite precast deck system. Hangers the main channel spans and constant depth for the Superstructure framing is edge girder with floorbeams box tie girders supporting a composite precast deck steel box girders made composite with a precast or precast decks. Since deck for the main span is not are stay cables for corrosion protection and approach spans. Pier segments and variable depth supporting a precast concrete deck. Since deck for the system. Hangers are stay cables for corrosion Bridge Description cast-in-place conventionally reinforced HPC deck. All readily replaceable, a 2" wearing surface must be replaceability. The steel girder approach spans segments may be cast-in-place. HPC used in both main span is not readily replaceable, a 2" wearing protection and replaceability. The approach spans are steel will be metalized for enhanced corrosion replaced periodically. All steel will be HPS and adjacent to the main span cantilever to meet the arch superstructure and substructure. The substructures surface must be replaced periodically. Substructures steel plate girders. All steel is HPS and metalized for protection. The substructures are founded on drilled metalized for enhanced corrosion protection. and provide a smoother transition. All steel is HPS and are founded on drilled shafts/caissons socketed into and pylons are supported on drilled shafts/caissons enhanced corrosion resistance. Substructures are shafts/caissons socketed into rock. Substructures and pylons are supported on drilled metalized for enhanced corrosion resistance. rock. socketed into rock. founded on drilled shafts/caissons socketed into rock. QUALITATIVE shafts/caissons socketed into rock. Substructures are founded on drilled shafts/caissons socketed into rock.

Lowest initial cost; High degree of redundancy; Deck Visually pleasing; Efficient use of steel; Moderate Visually pleasing; Enhanced redundancy & safety; Visually pleasing; Enhanced redundancy & safety; Visually pleasing; Moderate degree of redundancy & replaceable; Lighter weight superstructure resulting in Use of precast segmental construction results in a high degree of redundancy & safety; Lighter weight Efficient use of steel; Deck replaceable; Light weight Efficient use of steel; Deck replaceable; Light weight Advantages safety; Moderate weight superstructure; Balanced reduced foundation costs; Contractor familiarity; degree of initial quality superstructure resulting in reduced foundation costs; superstructure resulting in reduced foundation costs; superstructure resulting in reduced foundation costs; cantilever construction Construction minimally impacted by cold weather Balanced cantilever construction Float in construction for arch erection Float in construction for arch erection

Less visually pleasing; Heaviest superstructure requiresil largest tfdtiN foundations; Non-replaceable l bldk deck; Less visually pleasing; Difficult to maintain navigational Maintenance costs (overlay replacement); Segmental High initial cost; Less efficient for span under 600 ft; High initial cost; Less efficient for span under 600 ft; Disadvantages vertical clearance with deep tapered section over main erection impacted by cold weather; Heavy lifting Non-replaceable deck; Maintenance costs (overlay Non-replaceable deck; Maintenance costs (overlay Complex fabrication for arch span Complex fabrication for arch span channel span equipment required; Difficult to maintain navigational replacement); Longer construction time replacement); Longest construction time vertical clearance with deep tapered section over main channel span

Aesthetics YOU DECIDE

Construction Costs Lowest Moderate Higher Higher Moderate Moderate

Construction Time Shortest Moderate Longer Longer Moderate Moderate

Environmental Impact Minimal Minimal Minimal Minimal Minimal Minimal QUANTITATIVE Bridge Safety & Serviceability Best Good Good Good Better Better

Maintenance Costs Lower Moderate Higher Higher Lower Lower

HPC = High Performance Concrete HPS = High Performance Steel