钢筋混凝土柱考虑损伤累积的反复荷载-位移关系分析

为能在反复荷载作用下钢筋混凝土柱的荷载-位移关系分析中考虑柱低周疲劳性能,提出了一损伤模型,对柱中纵向受力钢筋和混凝土的损伤状态作评估与记录。将这一记录材料性能信息的损伤指标带入材料各自的恢复力模型以考虑产生损伤后材料的强度和刚度退化。基于多弹簧模型对不同变幅加载路径下及等幅低周疲劳加载下钢筋混凝土柱的空间反应进行了数值计算模拟。与已有试验结果比较表明,所提材料层次上的损伤累积模型以及考虑损伤累积效应的柱构件空间荷载-位移关系分析方法具有一定的精度,为钢筋混凝土柱的抗震性能分析提供了一个辅助工具。

Analysis of load-displacement relationship for RC columns under reversed load considering accumulative damage

A damage-accumulation model is presented to analyze the load-displacement hesteresis relation and the fatigue behavior of RC columns.Using the model,the damage states of longitudinal reinforcement and concrete are recorded.Then,the damage index recording the material's behavior is integrated into restoring force model of reinforcement and concrete respectively.Based on the multi-spring model,the numerical simulation of spatial responses for RC columns under variable-amplitude reversed loadings or constant-amplitude reversed loading is conducted.By comparing the numerical results with the experimental records,it can be concluded that the damage-accumulation model presented on material level and the computation method for load-displacement reversed hysteresis relation of RC coulumns conduce to results with considerable precision.The numerical calculation method can be used as an assistant tool to assess the seismic behavior of RC columns under an earthquake.