The final finite-volume discretization equations are derived using the Hamilton principle. Meanwhile the global nodal force vector, mass matrix and tangent stiffness matrix of the cable are obtained.

再根据哈密顿原理导出了悬索大挠度振动的有限体积离散方程，推出了索的整体节点力向量、质量矩阵和切线刚度矩阵。

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Stiffness matrix and equivalent nodal force formula, which take into account of the influence of shear lag, are derived subsequently on the basis of the definition of stiffness coefficient.

以其解析式作为形函数，利用刚度系数的定义，推导了考虑剪滞影响的箱形梁单元刚度矩阵及等效结点力公式。

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