Execution design study and fabrication drawings of two cable stayed (84m and 68m) and one composite lateral beams (6×23,5m) footbridges in the AIRBUS (AEROSPATIALE) industries at Toulouse, France. Steel structures (stiffened caissons). These walkways, pedestrian only, with elevators and wheelchair access, will prevent nearly 1.000 daily car movements on both sites, where 5.000 vehicles converge every day.

Client : Joseph Paris (France)

Our design office has been assigned by the steel fabricator Brisard Dampierre to execute the design study of the footbridge at Villetaneuse (Paris suburbs).

The footbridge will link the city center with the future tramway station and the University campus and is a part of pedestrian area with access for persons with mobility problems.

The structure crosses over four traffic fluxes, both rail and road :

• A future double track railway line
• An existing double track railway line
• A twin lane road
• A double track tramway line

The footbridge structure is a steel continuous structure with 3 spans: 40m, 64m and 49m. Regularly spaced steel diaphragms are used to support the cover which progressively closes from the embankments to the center.

Owner : EPA Plaine de France

Architect : DVVD (www.dvvd.fr)

Steel fabricator and client : Brisard Dampierre

Images: DVVD

Design study of a footbridge over the river Aisne in the city of Rethel (France). The footbridge has a span of 50m and a width of 3m and is suspended buy two steel pylons of 12m height with an inverted V shape.

Our design office, as subcontractor of the consortium which was awarded for this project, realized the structural design for the project and carried-out the mission of controlling all the execution design documents (calculation notes and drawings).

Architect : Laurent Barbier (Groupe Renaissance SARL d’Architecture)
Principal design office : B&R Ingénierie Nord
Construction : BERTHOLD

Images: Laurent Barbier

Execution design study of a footbridge over the river Marne in the city of Meaux (France).

The footbridge has a form of an L in plan with one straight branch (L=39m) and a continuous two-span second branch (L=77,4m). The structure is formed by a central box girder with cantilever beams welded on it (tapered I section) supporting a wood deck on one side and a bicycle lane on the other side.

A special plated steel part allows the continuity of the two straight parts of the L form. This special part has been designed using finite element analysis.

Architects :  DVVD / D. Vaniche, V. Dominguez, B. Potel (www.dvvd.fr)
Client : Brisard Grand Travaux

Images: DVVD,  Vincent  FILLON and toutenphoto.net

A new footbridge with a single 100m span is constructed as part of a large development project on the Seguin island (Paris, river Seine) at the location of the old Renault plots.

As for all modern footbridges a verification of the human induced vibrations and the risk assessment for discomfort (insecurity feeling) which may be provoked is requested.

The footbridge is a steel structure made by two lateral box girders linked together by transversal steel beams supporting a steel orthotropic deck. We have been assigned by the fabricator EIFFAGE MÉTAL to proceed with the dynamic verification of the structural vibrations and the adequacy of the specific equipment (tuned mass dampers) to palliate the excess and to respect the normative criteria of acceptance. A full finite element model has been used to achieve this goal.

Owner authority : Val de Seine Aménagement
Architecte: Atelier Jean Nouvel
Initial design : INGEROP
Technical checker : SOCOTEC
Steel fabricator : EIFFAGE MÉTAL

Execution design studies, drafting and detailing drawings of a steel box girder footbridge (length 162m) in the city of Dax (south France). The footbridge is supported by tubular columns randomly distributed longitudinally and transversely.

Client : Joseph Paris (France)

This new pedestrian footbridge is part of the 2024 Olympic Games in Paris and will provide access to the Aquatic Center by linking it to the Stade de France square.
The new footbridge will be over 100m long and 18m wide. It will cross the A1 freeway and the Avenue du Président Wilson.

The steel structure of the footbridge is made up of two longitudinal box girders with variable inertia. Transversally, the footbridge supports the 18m useful width thanks to a deck composed of ≪ trapezoidal stiffeners ≫ operating as a transverse orthotropic slab. This deck has a double function: dedicated entirely to pedestrians in the Olympic Games phase, it will be equipped with plantations and prefabricated concrete benches in the so-called Heritage phase.

The builder of the steel structure entrusted our team with the project development studies as well as the execution design studies of the steel structure of the footbridge.

Architectural study: VenhoevenCS (Netherlands) / ATELIERS 234 (France)

Structural study: Schlaich Bergermann partner (Germany/France)

Execution design study steel structure: Equilibre Structural Engineers

Contractor Nomineet: Bouygues Bâtiment île de France/Eiffage Métal

Concessionaire : Simbala

Contracting authority : Métropole du Grand Paris.

This bridge will connect the two parts of the Athletes’ Village between the cities of Saint-Denis and L’Ile-Saint Denis, which is part of the structures of the Paris 2024 Olympic Games. It will be dedicated to pedestrians, cyclists and buses. It crosses the Seine without being supported within the river (free span between the C0 west abutment and the P1 support of 109 m) thanks to its design with a V-shaped slant-legged intermediate support (P1) located on the east bank. Between support P1 and abutment C2 it also crosses the RD1 road network over a length of 29 m. Its total length is 138 m with a variable width of 18 to 23 m, including two lanes for road traffic (buses) of 3.50 m each.

The structure is a composite bridge comprising four box girders of variable height connected with transverse beams. Pre-stressed cables are designed and placed in pairs inside the four box girders. They are anchored to the C2 abutment to the east.

The assembly of the structure is also of particular interest: after assembly of the steel structure at the port of Gennevilliers and transport by boat to the site of the final installation of the main section weighing 1500 t, the structure is placed on its final supports.

The delivery of the structure is planned in the summer of 2023 and the total budget is 31.2 M€.

EQUILIBRE, in collaboration with Bureau Greisch (Bélgique) and on behalf of Eiffage Métal (steel contractor), carried out all the execution studies on the steelwork of the structure and the principal temporary equipments, as well as the necessary capacity and deformation verification studies during all the assembly phases.

Project owner: Department of Seine Saint-Denis

Project Design Group :
             Architects: Lavigne-Chéron, Philippon Kalt
             Structure: ARTELIA

General contractor: EIFFAGE Génie Civil

Construction of the steel structure: EIFFAGE METAL

Erection operations : SARENS

Video of the assembly on the port and river transport and installation on final supports (28-10-2022)
https://youtu.be/E2a-6yh6oLY
https://youtu.be/xk3LqQnI9Kc

Virtual images: Lavigne-Chéron
Photos: SAP Photographie