摘要
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 .
According to the concept of the equivalent uniaxial strain propounded by Darwin and Pecknold, on the base of the 3D axial symmetric orthotropic hypoelastic model of Elwi and Murry, a 3D orthotropic model of hypoelasticity is proposed for concrete. As the orthotropic model is applied, the directions of the principal stresses can be changed at a load increment. In order to track the directions of the principal stresses and calculate exactly the equivalent uniaxial strains, a 3D principal stress turn rule is presented. Then on the base above, a procedure of 3D nonlinear finite element analysis for reinforced concrete is done and several examples are analyzed. The result shows that the model and the rule is reasonable, useful and can be used commonly for 2D and 3D nonlinear finite element analysis for reinforced concrete.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2000年第1期123-126,共4页
Journal of Harbin Institute of Technology
关键词
混凝土
正交异性
次弹性本构模
三维
有限元
concrete
the equivalent uniaxial strain
principal stress turn rule
orthotropic
