Design & Statics
In contrast to conventional structures the final shape is decisively determined by the membrane statics in the case of textile roofing.
This is why the design planning of membrane structures must take place in close coordination with the static analysis in order to obtain a conception that is impeccable in respect of efficiency and aesthetics. Creative co-operation between the architect and the membrane producer's specialist engineer is recommended from the very beginning of the first design stage.
The jointly developed conception should take account of the following criteria:
- aesthetic design as per the builder´s/architect´s wishes
- geometrical shaping possibly adapted by the CENO specialist engineer
- structurally required elements (positioning of supports, bracings, anchoring etc.)
- planned budget
Textile roofing as well as conventional structures belong to the category of permanent structures; it is therefore necessary to obtain a planning and building permission according to state-specific standards.
Apart from the planned shaping, the final verifiable statics must take the technical data and the biaxial expansion behaviour of the membrane material as well as the load assumption contained in the respective building code into account.
Following the approval of the static calculation by the building authority the design drawings will be prepared in co-operation with planners and builders on the basis of the architect's implementation planning.
Normally, the bearing structure and the membrane will be prepared in the manufacturer's firm so that it is ready for assembly, just like a prefabricated house.
Pneumatically supported structures
The way of static calculation also applies to the pneumatically supported structures where the load transfer from outer loads is carried out by the overpressure. Sufficient bending of the membrane surface is also required; the smaller the radius, the smaller the loads acting on the bearing structure.
The advantage of air-borne constructions is that they offer the possibility to use lighter bearing constructions which - apart from the outer loads - have to be designed for the horizontal loads from an air cushion only. Please note that the support air blower selected works with conditioned air and that it is equipped with a redundant circuit.