| Summary |
ETFE-film has the characteristics of weak strength, low rigidity and large creep strain. In the past, the authors proposed the tensile membrane structure with a spring-strut system, which based on the characteristic of ETFE-film. And this research clarified an availability of this system from the point of the allowable stress design method.
On the other hand, we consider that the stress relaxation for tensile membrane structures using ETFE-film is becoming one of the agenda to be examined in the future. From this point of view, in this paper, focusing on the physical properties called a crystallization of the ETFE-film, the several material experiments based on hysteretic loading and re-introduction of tensile force are executed. These experiments are mainly the uniaxial extension test and the biaxial extension test. Based on the results of these tests, “stable strain” is evaluated and the authors propose the stress-strain model for the design.
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