中文说明：
用matlab编写的，有限元三维梁单元的单元刚度矩阵计算程序，各节点6个自由度。
English Description：
The element stiffness matrix calculation program of finite element three-dimensional beam element written in MATLAB has 6 degrees of freedom at each node
Calculation of element stiffness matrix of 6-DOF finite element three-dimensional beam element
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中文说明：
用matlab编写的，有限元三维梁单元的单元刚度矩阵计算程序，各节点6个自由度。
English Description：
The element stiffness matrix calculation program of finite element three-dimensional beam element written in MATLAB has 6 degrees of freedom at each node