钢筋混凝土三维轴对称非线性有限元分析

3-D Axial-symmetric Nonlinear Finite Element Analysis for Reinforced Concrete

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 the equivalent uniaxial strain propounded by Darwin and Pecknold, two amendments are made to the 3-D axial-symmetric anisotropic hypoelastic model of Elwi and Pecknold: 1. the discriminatory rule for 2-D principal stress rotation is corrected to aviod the discontinuous result obtained by using the primary rule ; 2 a formula is given for calculation of equivalent uniaxial strain corresponding to the ultimate stress to keep. The calculated stains in good agreenment with the experimental results and then 3-D axial -symmetric nonlinear finite element analysis is then made for reinforced concrete with several examples. The result shows that the amendments is rationale and applicable to 3-D axial-symmetric nonlinear finite element analysis of reinforced concrete.