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Lully Viaduct

General Information

Name in local language: Viaduc de Lully
Completion: 1995
Status: in use

Project Type


Location: , ,
  • A1 Expressway
Coordinates: 46° 49' 40.71" N    6° 50' 49.86" E
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Technical Information


height 16 m
total length 963.398 m
span lengths 29.925 m - 21 × 42.75 m - 29.925 m
number of spans 23
bridge surface 26 456 m²
deck width 2 × 13.53 m
deck depth 3.85 m
deck slab thickness 0.25 - 0.60 m
girder depth 2.90 m
girder width 4.00 m
piers number 44
piles diameter 1.00 m


deck structural steel 2 650 t
concrete volume 10 060 m³
reinforcing steel 130 kg/m³
piers concrete volume 622 m³
piles reinforcing steel 150 kg/m³
total length of piles 3 740 m


piers reinforced concrete
deck truss steel
deck slab reinforced concrete
abutments reinforced concrete

Products, Services & Reports

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The innovative design of the Lully viaduct proposes a light and transparent structure made of a triangular cross-section fabricated entirely from unstiffened circular tubes. The result is twin space trusses, with a typical span of 42.75 m. Each transversal triangular cross-section is 2.9 m high and 4.0 m wide, and is supported by a single slender pier. The largest diameters and thickness of the tubes are over 500 mm and nearly 70 mm respectively. Welded overlap K-joints and KK-joints form the brace-to-chord connections along the top and the bottom chords, respectively. The deck slab is connected directly to the top chord by uniformly distributed welded shear connectors.



Structural engineering
Checking engineering
Steel construction
Concrete construction
Expansion joints

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