STUDY OF STRENGTH PERFORMANCE, CONNECTIONS OF ETFE FILM FOR ENCLOSING STRUCTURES OF LARGE-SPAN STRUCTURES
DOI:
https://doi.org/10.36773/1818-1112-2025-138-3-75-83Keywords:
polymer films, ETFE, uniaxial and biaxial testing, adhesive joints, mechanical connectionsAbstract
Up-to-date architectural and engineering tasks require application of innovative materials, granting not only enhanced performance, but also compliance with criteria of energy efficiency, eco-and technology-friendliness. Ethylene tetrafluoroethylene (ETFE) film is one of such materials. ETFE was initially developed as a lightweight heat resistant film in the aerospace industry. However, it has been successfully applied in the construction industry for many years, including as translucent enclosing structures.
Within design development of the biosphere string tent shed the properties of ETFE film were studied, while the material enables covering over significant spans at minimal weight. Moreover, ETFE film has a whole range of unique properties, such as high strength, UV resistance, high translucency, including the light spectrum necessary for photosynthesis. That makes ETFE film an ideal candidate for creation of closed complexes with manmade manageable ecosystems.
In course of computer modelling of ETFE film serving as a roofing element of the tent shed an issue arose with regard to its properties, i. e. whether to consider the film as a linear isotropic material, thus facilitating the calculation, but it might stretch the reality of stress-strain behaviour, or whether to consider it as nonlinear anisotropic material, thus facilitating more correct description of ETFE film behaviour under different loads.
Herein, the strength parameters of ETFE film were defined in different directions. Dependency of action of temperature on strength performance, as well as influence of cyclic loads on the material was set.
The appropriate tests were conducted, which results formed the basis for the design solutions for the tent shed covering in order to choose the most effective methods to interconnect the film sheets, including the ones via welding and mechanical connections.
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