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根据Darwin和Pecknold提出的“等效单轴应变”概念 ,在Elwi和Murry混凝土三维轴对称模型的基础上 ,建立了混凝土三维正交异性次弹性本构模型 .同时考虑到正交异性模型应用时 ,在荷载增量的作用下 ,主应力方向可能会发生改变 ,提出了三维主应力旋转法则 ,以跟踪主应力方向 ,正确计算等效单轴应变 .在上述基础上 ,对几个试验进行了有限元分析 .分析结果表明 ,提出的模型和法则是适用可行的 ,可以普遍用于钢筋混凝土的二维和三维非线性有限元分析 .
Based on the concept of “equivalent uniaxial strain” proposed by Darwin and Pecknold, a three-dimensional anisotropic elastic constitutive model of concrete is established on the basis of the 3D axisymmetric model of Elwi and Murry concrete. Meanwhile, considering the application of the orthotropic model , Under the action of load increment, the direction of principal stress may change, a three-dimensional principal stress rotation law is proposed to follow the direction of principal stress and calculate the equivalent uniaxial strain correctly.On the basis of above, several experiments were carried out The results of finite element analysis show that the proposed models and rules are feasible and applicable to 2D and 3D nonlinear finite element analysis of reinforced concrete.