Residential Timber Buildings in Strasbourg, France

Structures Analysed with Dlubal Software

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RFEM model of the residential building

Different views of the residential building model in RFEM

Architectural model of the residential building (© KOZ Architectes)

Customer Project

21 December 2017

France RFEM Buildings Laminate, Sandwich & CLT Structures Timber Structures

Structural Analysis	Ingénierie Bois Bischeim, France www.ingenieriebois.fr
General Contractor and Concrete Design	Eiffage Construction Oberhausbergen, France www.eiffageconstruction.com
Architecture	ASP Architecture Saint-Dié-des-Vosges, France
Investor	Bouygues Immobilier Strasbourg, France www.bouygues-immobilier.com

Nowadays’ mastery of design methods and fabrication techniques of CLT panels allow for easier design and construction of high‑rise timber buildings.

‘Îlot bois de Strasbourg’ is one of the first CLT building project in France that exceeds 30 m in height. This building complex consisting of three high‑rise buildings provides commercial premises on the ground floor and 146 residential units on the upper floors. The entire structure has a total area of 9,300 m².

Structure and Design

The structural concept of the building with 11 above-ground floors is based on using several types of the CLT panels, depending on the floor. That is, the higher is the floor the smaller is the panel thickness. The cross‑laminated timber walls ensure the stability of the building.

Due to the diaphragm effect of the floors, the horizontal forces caused by seismic activity and wind are transferred by the vertical supporting members to the foundations.

The floors are supported by a glulam column-beam system that doesn’t contribute to the stability of the building. Some of the timber downstand beams are replaced by steel beams. The bottom reinforced concrete part of the structure (ground floor) is very important as it absorbs the vertical and horizontal loads from the upper floors and transfers them on the pile heads.

For the design of the CLT panels and for seismic analysis, the structural analysis software RFEM has been used.