Three node cable element 节点索单元
three-node beam element 三节点梁单元
three-node triangle element 三结点三角形单元
spatial three-node beam element 空间三结点梁单元
The thead element has a single child node, tr, with three children - all th elements.
thead元素只有一个子节点tr，后者有三个子节点—所有th元素。
Usually the numerical manifold method (NMM) is based on meshes of three - or four-node element.
数值流形方法常基于有限元法三结点或四结点单元。
The three-node beam element tangent stiffness matrix including the geometric stiffness matrix is developed according to the nonlinear finite element theory.
进而依据非线性有限元理论推导了该三结点梁单元的几何刚度矩阵的单元切线刚度矩阵；
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