Residential Timber Buildings in Strasbourg, France
|Structural Analysis||Ingénierie Bois
|General Contractor and Concrete Design||Eiffage Construction
Length: 32 m | Width: 22 m | Height: 38 m
Number of Nodes: 3,069 | Members: 923 | Surfaces: 842
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.
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Programs Used for Structural Analysis
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Deflection analysis and stress design of laminate and sandwich surfaces
Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)