Infrastructure Canada and the Public Works Ministry of Canada have presented a bid for the design and construction of a new bridge over the St. Lawrence River as part of the St Lawrence Corridor Project. This project, which covers a highway of about 8 km, includes a crossing over the St. Lawrence River between Montreal and Brossard that will replace the existing Champlain Bridge.
The new bridge is 3.4 km long and spans from Île de Soeurs to the west shore of the St. Lawrence River. It consists of one cable-stayed bridge and two approach bridges on its east and west sides. The west approach bridge is 2 km long and includes three independent decks. The lateral decks will carry vehicle and pedestrian traffic, while the central deck will carry bus traffic as well as tram traffic in the future.
Pedelta provided engineering services for the development of the Design Peer review of the First Draft Design of the New Bridge for the St. Lawrence West and East Approach Superstructures and the preliminary design of five bridge alternatives for the West approach, including various span lengths and erection staging. The services included the preliminary design of a typical steel pier cap.
Pedelta provided the CJV with the optimization of the steel structure during the bid process that helped to win the project.
Pedelta has been retained by the referred joined venture to review the proposal prepared by the project design team for the deck and the pier caps of the west side approach bridge.
Pedelta has completed a predesign of the three composite decks for four different typical span lengths ranging from 66.40 m to 95.00 m. In addition various construction methods and innovative materials were considered, such as high strength steel and concrete with double composite action. A metallic alternative solution for the pier caps, which are 50 m wide and support the three decks, has also been studied.
The study has been performed according to the technical specifications applicable to this bridge, the Canadian Highway Bridge Design Code for the general design of the structure and EN 1994-2 (structures related Eurocode) for design of the main beams.