URBAN INTEGRATION
The main challenge of the project was to conceive a building that would immediately express its functions through its volume and silhouette, while adding vitality to the subdued, bureaucratic surroundings of the office sector of city of Luxemburg. Composed of three distinct volumes articulated through two intervals, our building establishes a dialogue with the main scales of the site, both at street level and at a distance.

THE ARCHITECTURE OF THE ARCELORMITTAL BUILDING
We developed a concept that takes advantage of programmatic requirements. Our 100m tower is composed of three distinct parts in a vertical sequence of volumes articulated by garden terraces. The lower volume is public, containing a conference center and restaurants; the middle volume is intended for rental offices; while the top volume is reserved for the Head Offices of ArcelorMittal.

Providing a symbol of advanced and innovative steel construction in the 21st Century, the Tower relies on two steel-braced frame cores surrounding the stairs and elevators to resist vertical and lateral loads and to provide overall stability. Each floating volume provides a network of full-height trusses at the lowest level that cantilever out from the core.
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The “base” is urban, responding to the site geometry by relating to the scale of pedestrian spaces. It includes lobbies and shared spaces such as restaurants and conference centers.

The ground floor includes the entrance hall and restaurants sheltered by the conference center above it. Located on the roof of the conference center is a suspended garden specifically intended for conference-center users. The ground floor offers two lobbies, one for ArcelorMittal, the other for rental. It also provides access to the South Esplanade and its restaurant terraces.

The “middle” offers office spaces for sale or rent, allowing for flexible work patterns. Above the rectangular volume is a garden terrace intended for renters.

The “top” provides a contemporary mixture of lifestyle and invention. Wellness, flexible use, and potential reconfiguration and evolution were our goals. With those aims in mind, we developed a new type of space that is simultaneously a free horizontal plate and a light, 4% ramp allowing for communication among the different departments of ArcelorMittal.

Each level (3000m2, including cores) is composed of two parts – the horizontal floor plate (1200m2) and the light-graded ramp with its accompanying levels. Both allow multiple configurations – closed offices, open spaces, meeting spaces, and insulated boxes.

Ascending or descending the spiral occurs on the periphery on approximately two-thirds of the floor plate edge. Along the facade, large landings (each approx. 40m2) allow for offices and open spaces to be distributed.

The flexible plan allows the maximum amount of space for ArcelorMittal to communicate, expand, or adapt according to the needs of its different teams. back

Credits

SCHEDULE
International Invited Competition, 2017 (including: N. Foster, J.-M. Wilmotte, OMA, M. Fuksas, R. Viñoly)

SIZE
600,000 sq. feet (55,000m2)

BUDGET
$200 M

CLIENT
ArcelorMittal

TEAM
Lead Designer: Bernard Tschumi. Key Personnel: Joel Rutten, Cecil Barnes, Jerome Haferd, Pierre-Yves Kuhn, Pedro Camara, Clement Laurencio, and Fiona Caselli
Structure, Mechanicals: Arup (Ray Quinn, David Farnsworth, Michelle Roelofs, Brian Streby)
Cost Estimator: BMF (Renaud Chanceaulme, Michel Forgue)
Renderings: By Encore (Guillaume Paturel)
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Program: Offices