考虑不同破坏模式的二维混凝土本构模型

本文提出了一种可以考虑不同破坏模式的二维混凝土本构模型。该模型将混凝土按不同应力组合进行分区,按分区设定加卸载力学行为和非线性指标,可以较好地模拟混凝土在非比例加载情况下的力学行为。模型中除常见的固定裂缝模型(FCM)外,还可以选择使用转动裂缝模型(RCM),从而可以分析较复杂的混凝土开裂行为。本文还介绍了利用有限元软件MSC.MAR的二次开发功能将该模型嵌入MARC的方法。并用算例说明了本模型在解决一些复杂问题上的优势。

CONSTITUTIVE MODELS FOR CONCRETE WITH VARIOUS FAILURE TYPES

A constitutive model for concrete considered different failure modes is proposed in this paper. It is found that the failure modes of concrete can be divided into several zones according to the principal strain ratio. It is obvious that the loading or unloading behaviors and nonlinear indexes are assigned to various zones. It must be noticed that the behavior of concrete under disproportionate loading can be simulated well. Both fixed crack model and rotating crack model can be considered in the model for the complex fracture of concrete. It is also introduced to that the model is embedded into the software of MSC.MARC. An example is shown that the model is feasible for some complex problems.