单轴受拉状态下混凝土非局部化细观损伤模型

Nonlocal Micro damage Model for Concrete Under Uniaxial Tension

摘要:

以非局部化理论和随机损伤力学为基础，从细观机制出发考虑断裂和塑性滑移的影响，提出了非局部细观损伤模型.利用残余应力系数反映塑性滑移对损伤细观机制的影响；利用非局部化比例解决层数敏感性问题.结合细观和宏观两个尺度进行损伤本构模型建模，描述混凝土内部的应变发展、损伤演化以及沿受力方向任一高度处的应力应变关系.基于非局部化比例分析得出的应力应变关系与实验结果符合较好.

Abstract:

Based on nonlocal theory and stochastic damage mechanics, a nonlocal micro damage model is developed. By introducing the residual stress factor, the plastic slip effect on damage is reflected. Avoidance of spring layer sensitivity can be achieved with nonlocal proportion. A two scale damage model provides knowledge about strain development, damage evolution and elaborate stress and strain relationship. The non local proportion based analysis leads to stable and reasonable results, which agree well with experimental data.