Construction of the ÖkoFEN Headquarters, Saint Baldoph, France
In order to meet the increasing demand added to the staff numbers, the company OköFEN, specialized in wood pellet boilers, conducted the construction of new premises for its French head office. This project is rooted within an environmental approach featuring a structure entirely made of French wood, a biobased insulation in cellulose wadding added to a significant supply of natural light thanks to its multiple openings.
|Investor||ÖkoFEN Real Estate|
|Architect||Atelier 17C Architectes|
This project features 2 buildings which are connected to each other by a metal footbridge.
The first part consists of a storage area measuring 46x62m, made of truss frames of the Ariane © type ( solid timber 80 mm wide and joints with plywood gusset and spikes) displaying a range of 20 and 26 m with cantilevers of 5,6 m. The structure relies on foundations made of isolated studs, connected by prefabricated stringer beams, allowing the elevation from the ground of the non-load-bearing timber framing facades.
The second part consists of an office building extending from the ground floor to the first floor of approximately 10x30m made of timber frame walls and roof boxes industrially prefabricated with cellulose wadding insulation also factory made. The timber frame is lifted upon the ground by foundations made of prefabricated stringer beams. The floors of the Southern offices are made of O'Portune slabs displaying a range of 10 m.
All facades are covered with natural timber cladding.
Structural Design Software
The structural design of the 2 buildings was carried out by the RFEM software. The building is located in seismic region of magnitude 4, which required design checks under seismic loads generated with the RF-DYNAM Pro add-on.
The entire timber structure of the warehouse area was checked in the RF-TIMBER Pro add-on according to Eurocode 5.
The modeling of the office area was especially necessary for the dimensioning of the walls subjected to seismic loads. In order to generate this modeling, the timber frame walls were converted into equivalent members reproducing the stiffness of a wall. Such an approach enabled the evaluation of the forces transmitted within each wall hence justifying the bracing of the building.
The steel footbridge was also modeled in RFEM and the member design was performed thanks to the RF-STEEL EC3 add-on.
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In this article, the adequacy of a 2x4 dimension lumber subject to combined bi-axial bending and axial compression is verified using RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
Footbridge Connecting the Storage Area to the ÖkoFEN Headquarters Office Building, Saint Baldoph, France (© CBS-CBT)
RFEM/RSTAB add-on module RF-/JOINTS Timber-Timber to Timber | Design of direct timber connections according to Eurocode 5
RFEM/RSTAB add-on module RF-/TIMBER SANS | Design of members made of timber according to SANS 10163 (South African standard)
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