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；
As a result, the element tangent stiffness matrix is symmetric and is updated by using the total values of the nodal variables in an incremental solution procedure.
因而，得到的单元切线刚度矩阵是对称的，此外在增量求解过程中用节点变量的全量进行更新。
The precise tangent stiffness matrix of space cable element is derived in this paper by using equilibrium equation.
本文采用状态平衡方程推导出用超越函数表示的空间索单元切线刚度矩阵的精确表达式。
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