But force shape functions in flexibility methods establish the relations of nodal forces and section forces, and the results are exact.

而基于力的形函数的柔度法建立了单元两端与单元内部力的关系，能够得到精确的结果。

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Equivalent additional stress method can be the same with integral method or combined method depending on the equivalent method of additional nodal force calculated.

等效附加应力法根据附加节点力计算方法的不同分别对应整体式和组合式方法。

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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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