| Summary |
Membrane material is an anisotropic material inc1uding material high nonlinearity. Therefore，a contradiction will occur if it is treated as an isotropic elastic material. There have been many efforts to avoid this contradiction，and the method that seems to be the most desirable is to adopt the fabric lattice model. However， to directly analyze such membrane material modeled by the lattice model is not appropriate in practice. In this paper，the constitutive equations based on this model which could be applied in the finite element method will be derived. Because of introducing this procedure，it is expected that treatment of a material nonlinearity will be easier in large membrane structures.
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