应用纤维单元模型对钢筋混凝土结构进行损伤分析,并定义了铜筋混凝土构件的损伤准则和结构整体损伤准则.对一铜筋混凝土悬臂柱进行了损伤分析,结果表明,纤维单元模型能以很低的计算成本获得很高的计算精度,并能很好地模拟柱竖向剩余承载力的退化过程.对一个4层的钢筋混凝土框架结构进行了损伤分析,结果表明,所有框架底层柱的损伤发展趋势相同,然而轴压比大的柱总滞回耗能小、累积破坏更明显、结构延性较差,其首次超越破坏的阈值较轴压比小的柱大;结构薄弱层的损伤发展过程与单个柱的损伤发展过程相似,表现为地震动加速度峰值时刻的损伤迅速发展,其余时刻的结构损伤指数缓慢增加.
The fiber model was established to analyze the dynamic elastic-plastic response of a RC cantilever column. The damage criterions for fiber element and structure of reinforced concrete were defined. Simulation results showed that the fiber element model can simulate both the elastic-plastic responses and axial load-carry capability degradation of the column accurately with low cost of calculation. The damage development process of a 4-story reinforced concrete frame was then analyzed, and the results indicated that the damage development processes of the columns in the first story were almost the same, and the columns with relative high axial compressive ratio had a lower hysteretic energy absorbing capability, higher degree of cumulative damage, poorer ductility, and higher damage threshold compared with the columns with relative low axial compressive ratio. And the global damage development process of the first floor was similar to that of a single column, as the damage index ? increased with speed? at the peak acceleration point, androse slowly at the other moments.