为提高精度，采用自修改机制和加权组合方法。
For descreasing error, self - revising and weighted methods are used.
本文采用替换式拉格朗日乘子法施加本质边界条件，为提高精度，对修正泛函使用罚函数法再次施加本质边界条件。
The paper employs alternative Lagrange multiplier method to enforce the essential boundary condition, and the penalty function is employed again in order to improve the accuracy.
为提高精度，在渐变应力比突变应力更符合实际的基础上提出应力在各时段内线性变化的假定，在此假定下推导了应力计算的一般公式，用于实测应变资料的分析计算。
Based on an analysis of the sources of errors, a linear variation of the stress at each stage was assumed, and a general formula for stress calculation was deduced.
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