三向受压混凝土的三维本构关系

提出一个三向受压混凝土的本构关系模型。基于亚弹性正交异性理论，采用Ottosen的破坏准则，把Darwin和Pecknold的等效单轴应变概念进一步推广到三维非线性增量应力—应变关系中。模型的特点是：它建立在前人的研究成果基础上，所有的参数均建立在试验数据的基础上，只需输入少数的材料参数便可确定本构模型，因此便于在实际工程分析中应用。

3D Constitutive Relationship of Confined Concrete

A constitutive relation model of concrete subjected to triaxial compressive stresses is presented. The proposed material model is based on a hypoelastic orthotropic approach. The criterion proposed by Ottosen is adopted herein and the equivalent uniaxial strain concept of Darwin and Pecknold is incorporated further to the nonlinear three - dimensional incremntal stress - strain relationship. The model has the following characteristics: it is based on the research achievements of previous researchers and all the parameters are obtained form experimental data; and very a few inputted material paramter is needed to define the constitutive model, thus it is convenient to be employed in the analysis of engineering structures.