The D2 Tower is located on the edge of the circular boulevard in La Défense, surrounded by the CB16, Aurore and Manhattan towers, in the extension of the CBX tower. It will replace the current Véritas building.
The D2 Tower is the first tower of mixed load-bearing structure in La Défense with a metallic exo-structure. Its framework consists of a reinforced concrete core and an external steel mesh, the design of which forms faceted diamonds. It is capped with a roof garden on its top floor.
- Office usage tower
- 50000m² of usable surface
- 180 m high
- 37 floors
- 3 underground floors
The main issue in sizing the mesh lies in limiting the differential deformations between the mesh and the core. The thermal gradient between the tubes and the rest of the structure was reduced thanks to the cowling and intelligent thermal insulation, and a detailed phased calculation has been implemented to account for core creep.
Site constraints are particularly strong in this project: the proximity of the surrounding towers and the infrastructures of the circular boulevard and the poor quality of the soil, conditioned the choice of deep foundations (60 m).
On the other hand, the presence of the Alsace gallery and of an ovoid in the basement under the influence of the nucleus necessitated the realization of significant load transfers and increased attention paid to the modeling of the basements.
A complete finite element model was used to study the dynamic and static behavior of the tower.
- Complete structure project management
- Preliminary design studies
- Drafting of the business consultation document for the structure part
- Work monitoring and control of execution plans
Client: SAS Tour D2: Sogeprom – Bouygues Immobilier
Project management Consortium: setec tpi (agent), DVVD, Atelier d ‘Architecture Anthony BECHU & Tom Sheehan
Cost of works: 172,000,000 €
Duration: 2008 -2012