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根据Darwin和Pecknold提出的“等效单轴应变”的概念，对Elwi和Murry三维轴对称正交异性次弹性模型进行了两点改进：1．修正了二维主应力旋转法则，避免了原来法则可能引起的计算结果突变；2．根据试验分析，提出了一个极限应力对应的等效单轴应变计算公式，使有限元计算结果与试验符合较好在此基础上，编制了钢筋混凝土三维轴对称有限元分析程序，对几个试件进行了分析．分析结果表明，改进是合理可行的，可以普遍用于钢筋混凝土三维轴对称非线性有限元分析．
According to the concept of “equivalent uniaxial strain” proposed by Darwin and Pecknold, two improvements are made to Elwi and Murry’s three-dimensional axisymmetrical orthotropic subelastic models: 1. Corrected the two-dimensional principal stress rotation rule to avoid the abrupt change of the calculation result that the original rule may cause; According to the test analysis, an equivalent uniaxial strain calculation formula corresponding to the ultimate stress is proposed, so that the finite element calculation results are in good agreement with the test. On this basis, a three-dimensional axisymmetric finite element analysis program for reinforced concrete is prepared and several tests are performed. Parts were analyzed. The analysis results show that the improvement is reasonable and feasible, and can be commonly used for three-dimensional axisymmetric nonlinear finite element analysis of reinforced concrete.