The nonlinear finite element method equations are presented in detail, considering the orthotropic material property of the membrane and the wrinkled or relax properties of elements.

• 详细推导了索杆膜空间结构的几何非线性公式，并且针对膜材的正交各向异性特性、膜材的褶皱、索的自重垂度、索的松弛等问题采取了相应的有效实用的计算方法。