一种新的混凝土单轴压缩损伤本构模型

现有的本构模型中很多采用以峰值点为界的分段方程描述混凝土的应力应变关系,而一些采用一个方程描述的混凝土本构模型时,为了能够正确反应混凝土压缩过程中的真实应力应变关系,多采用复杂的方程形式和较多的参数. 为了用简单的方程将上升段和下降段连接起来,本文以峰值割线模量为基准,定义了一种新的损伤变量;并以经典损伤理论模型为基础,根据混凝土损伤演化规律的概率密度服从Weibull分布,提出了一个统一的方程来描述混凝土单轴压缩时应力应变关系的全过程. 该方程形式简单,并只有一个参数. 通过与混凝土受压实验数据和Hog

A new damage constitutive model for concrete on uniaxial compression

Most forms of constitutive models are segmented description, and some models of continuous equation have to define complicated parameters to describe the behavior of uniaxial compression in existing concrete constitutive models. So in this paper a new damage variable was defined, then, Based on damage theory and Weibull distribution damage evolution rule, a simplified ameristic damage constitutive equation was established for concrete under uniaxial compression. There is only one parameter in this model. This model was contracted with experimental data and Hognestad model and code for design of concrete structure of China, and the error analysis has also been done. Good agreement is found between the theoretical predictions and experimental data of uniaxial compression. So it can be used in engineering because of the simple structure and few parameters.