损伤梁单元及其在RC结构构件非线性分析中的应用

A damage beam element model for nonlinear analysis of reinforced concrete member

本文介绍了一种基于损伤力学、断裂力学以及集中塑性理论建立的简化损伤梁单元模型。采用此单元模型,分析了实验梁在单调加载下的受力性能,并与材料模型和弹塑性单分量模型分析结果进行比较。算例表明简化损伤梁单元模型对于RC结构构件的非线性分析有良好的适应性,可以有效地模拟构件的开裂、屈服和失效全过程;得到直接从力学意义出发的反映结构损伤的损伤内变量,对结构的损伤评估有启发意义。

This paper presents a simplified damage beam element model, based on the concepts of damage mechanics, fracture mechanics and lumped plasticity theory. The nonlinear analysis results of the tested beam under monotonic loading obtained by use of the simplified damage element model have been compared with the results by use of the material model and the elastic-plastic model .It is proved by calculation that the simplified damage beam model can well describe the nonlinear behavior of RC member and also can effectively model cracking, yielding and maximum of the member. Otherwise we can get a new internal variable, the damage for damage assessment in RC members.