| Summary |
　Membrane materials commonly used for permanent membrane structures have particular material characteristic such as the stress relaxation, which are caused by slackness and crimp interchange of yarns and viscoelasticity of coating resin. On the other hand, the disappearance of prestress by the stress relaxation of membrane materials is an extremely essential problem for Tensile Membrane Structure (hereafter TMS) stabilized by existing prestress in the membrane. In order to secure the structure performance, which includes design, construction and maintenance, "the macro-modeling of stress-strain curves which shows material nonlinearity including plasticity and stress relaxation of membrane materials" and "the structure analytical technique using this modeling" were proposed in our study, and their validity was verified. In this paper, the structure analytical technique is applied to the TMS in flat surface, and structural behaviors influenced by the amount of the introducted prestress are presented.
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