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The OA666 bridge on the new section extending the A4 motorway in Luxembourg towards France highlights the relevance of composite steel–concrete solutions for modern infrastructure projects.
The deck is extremely slender: the central spans extend over 50 m with a constant structural depth of 1.35 m. The geometry is complex, as the road axis follows a clothoidal alignment with a minimum radius of 640 m in the horizontal plane and crosses an existing roadway with a variable skew angle.
The construction site is surrounded by existing local roads and a lake. The steel structure (total weight 1,300 tonnes, total length 126 m) is entirely made of thermomechanically rolled S460 steel, with material thicknesses of up to 100 mm.
Contracting authority Ministère du Développement Durable et des Infrastructures / Administration des Ponts et Chaussées
Etude 2015-2017
Bridge:
126 m long continuous composite steel-concrete bridge
3 spans: 38 m – 50 m – 38 m
2 independent decks – total width 31 m
Excavation: 11,000 m³, Embankments: 8,000 m³
Concrete: 8,000 m³
Piles: 940 m, diameter 1.20 m
Reinforcement steel: 1,000 t
Structural steel sections and PRS: 1,250 t
Prestressed bolts: 14,400
Dowels: 10,400
Acoustic complex:
Structural steel: 70 t
Absorbing panels: 700 m²
Transparent curved plexiglass: 500 m², Flat plexiglass: 700 m²