Recreational Area Tension Membrane Structure in Châteauneuf-de-Galaure, France

The engineering company ACS provided the full project structural analysis and design, including the fabric membrane and frame structure.


The covered recreational area consists of 6 frames with steel tube columns and welded galvanized steel I-beams covered with a double-curvature PVC membrane. The roof spans the Foyer de Charité de Châteauneuf-de-Galaure, Drôme department school grounds.

A channel system integrated into the welded I-beams and downpipes integrated into the columns allows unobtrusive rainwater drainage and improved esthetic appeal.


For the structural design, the following Dlubal Software programs were utilized: RF-STEEL EC3 add-on module for the calculation of the steel supporting structure, the RF-FORM-FINDING add-on module to determine the fabric membrane shape and determine the membrane ultimate limit state, and the RF-CUTTING-PATTERN add-on module to create the fabric cutting pattern geometry.

To begin, a general structural analysis model, including the steel frame and membrane, was created. The supporting steel structure was further designed taking into consideration the fabric membrane forces. Additionally, the fabric analysis and design were carried out for the overall structure design.

In the second phase, the roof panels were separated and the fabric stress curves and changing curvatures were checked. A second, more accurate and detailed model was developed.

The modeling phases alternated with the design phases to take into consideration the interaction of the fabric and frame.

Location 85 Rue Geoffroy de Moirans, 
26330 Châteauneuf-de-Galaure, 
Investor O.G.E.C 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

Project Specifications

Model Data

Number of Nodes 281
Number of Lines 329
Number of Members 249
Number of Surfaces 60
Number of Load Cases 9
Number of Load Combinations 50
Number of Result Combinations 5
Total Weight 26.860 tons
Dimensions (Metric) 41.160 x 20.371 x 9.325 m
Dimensions (Imperial) 135.04 x 66.83 x 30.59 feet
Program Version 5.22.03

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