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

Customer Project

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

Investor O.G.E.C Châteauneuf - Saint-Bonnet, Châteauneuf-de-Galaure, Frankreich
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 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 over 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 allow for unobtrusive rainwater drainage and improved aesthetic 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 also 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 consider the interaction of the fabric and frame.

Project Location

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RFEM Main Program
RFEM 5.xx

Main Program

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

Price of First License
3,540.00 USD
RFEM Tensile Membrane Structures

Add-on Module

Form-finding of tensile membrane and cable structures

Price of First License
1,750.00 USD
RFEM Tensile Membrane Structures

Add-on Module

Generation of cutting patterns for tensile membrane structures

Price of First License
2,240.00 USD
RFEM Steel and Aluminium Structures

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD