ETABS中的面定义有DECK、PLANK、SLAB三种形式和一种WALL的定义，其中DECK是具有膜属性的面对像，PLANK是膜单元(Membrane),仅具有平面内刚度。SLAB是完整的壳元，具有平面外和平面内刚度。
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In which a new way to calculate element internal forces and nodal stiffness directly without transformation from membrane element to equal bar element is submitted.
其中，对于膜结构的单元内力及节点刚度，提出了一种新的计算方法，该方法可直接由膜单元确定单元内力及节点刚度，而无需将膜单元转换成等效的杆单元。
参考来源 - 索和膜结构形状确定理论研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以三角形膜单元为基础，推导了精度较高的有限元逆算法。
Based on the triangular membrane element model, a high precision inverse approach with finite element is deduced.
本文在已有的索单元力密度矩阵的基础上推导了三角形膜单元的力密度矩阵。
On the basis of force density matrix of cable element, a force density matrix of triangle membrane element is introduced.
尽量使一块膜布中包括的膜单元是完整的，不然还要经过插值核算确定膜块鸿沟点的方位。
As far as possible to make a membrane cloth, including the membrane unit is complete, or even through the interpolation calculation to determine the direction of the film block point.
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