Rest area with tensioned membrane in Châteauneuf-de-Galaure, France

Customer Project

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Investor OGEC Châteauneuf - Saint-Bonnet, Châteauneuf-de-Galaure, France
Construction Management H2C Architecture, Lyon, France
Structural Analysis AC Structures, Rennes, France
Frame structure ICM, Marseille, France
Membrane ACS Production, Montoir de Bretagne, France
The engineering office ACS was commissioned to carry out the entire structural analysis for the execution phase of this project (membrane and frame).


The covered break area consists of 6 frame columns made of tubular sections and welded I-beams made of galvanized steel as well as a membrane made of PVC with a double curvature. The roof spans the school sports grounds of the Foyer de Charité de Châteauneuf-de-Galaure, in the Drôme department.

A channel system integrated into the welded I-beams and downspouts integrated into the posts allow for inconspicuous drainage of rainwater, which does not change the clear lines of the structure.


For the design of the structure, the following programs of Dlubal Software were used: add-on module RF-STEEL EC3 for the calculation of the steel substructure, the add-on module RF-FORM-FINDING for the shape search as well as the ultimate limit state calculation of the membrane and the add-on module RF-CUTTING-PATTERN for creating the geometry of the fabric webs .

First, a general structural analysis model (frame and membrane) was created. Thus, it was possible to determine the dimensioning of the steel substructure taking into account the forces from the tensile force of the fabric. Likewise, a structural analysis of the orbits was performed as part of the modeling.

In the second phase, the panels of the roof were detached and the stress lines in the fabric and the curvature changes were checked. A second, more accurate and detailed model was developed.

The modeling phases alternated with the design phases to consider the interaction of fabric and frame.

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