论文部分内容阅读
为提高钢筋混凝土柱在快速循环加载下的动力滞回性能数值模拟计算效率并反映局部破坏特征,对通用有限元分析程序ABAQUS进行二次开发,编写了适用于三维纤维梁单元的混凝土和钢筋本构模型程序,在实现纤维梁单元和实体单元界面连接变形协调的基础上,建立了由三维实体单元和纤维梁单元组成的两尺度有限元模型。为了比较计算精度和效率,分别建立了试件的三维纤维梁单元模型和三维实体单元模型。分别对3种模型进行往复荷载作用下考虑混凝土材料应变率效应的钢筋混凝土柱动力滞回性能数值模拟,将两尺度模型的计算结果与试验结果进行比较。结果表明:所开发的材料本构模型程序以及两尺度模型能较好地反映钢筋混凝土柱在快速循环加载下的承载能力及滞回性能;所建立的两尺度模型既可节约计算成本,又能实现钢筋混凝土柱试件关键部位的精细化分析。
In order to improve the efficiency of numerical simulation of dynamic hysteretic behavior of reinforced concrete columns under rapid cyclic loading and to reflect the local failure characteristics, the common finite element analysis program ABAQUS was developed for the second time. Concrete and steel for the three-dimensional fiber beam elements Based on the modeling procedure, a two-scale finite element model composed of three-dimensional solid elements and fiber beam elements is established on the basis of the coordination of fiber-beam elements and solid elements. In order to compare the calculation accuracy and efficiency, the three-dimensional fiber beam element model and three-dimensional solid element model of the specimen were established. The numerical simulation of the dynamic hysteretic behavior of reinforced concrete columns considering the strain rate effect of concrete materials under cyclic loading was carried out on the three models respectively. The results of the two-scale model were compared with the experimental results. The results show that the developed material constitutive model program and the two-scale model can well reflect the carrying capacity and hysteretic behavior of reinforced concrete columns under rapid cyclic loading. The two-scale model can not only reduce the computational cost, Realization of the refinement analysis of the key parts of reinforced concrete columns.