Innovative Developments in Steel and Concrete Composite Plates for Two Recent French Bridges: The Saint Lazare Bridge and the Guerville Viaduct

摘要

Two complex bridges were recently completed using the concept of composite plate design. The first bridge to use this method, the Saint Lazare Bridge, crosses the busiest railway network in the city of Paris. The bridge consists of a 125-m-long steel box deck with a deck width of 17.5 m resting on V-shaped piers. The thickness of the concrete slab is 120 mm. The second bridge, currently under construction, is the Guerville Viaduct. This viaduct is a 360-m-long concrete-steel composite bridge with two I-shaped girders linked together by floor beams. The design of the central part of the deck, which is governed by a central span length of 116.5 m, requires a lighter and thinner slab than the typical reinforced concrete top slab. This led to the use of a composite plate that is 160 mm thick for the 157-m central part of the bridge. This paper presents the general design of both bridges along with the specific methodologies and calculations used for the composite deck plate designs.