低周反复荷载下再生混凝土柱损伤演化模型研究

通过对现有的两种混凝土损伤评估模型的分析，本文以刚度退化和累积滞回耗能两个指标来描述在低周反复荷载下再生混凝土的损伤累积过程，提出了一种适用于再生混凝土柱的双参数地震损伤模型．通过24 组文献数据拟合出模型参数的合理值与耗能因子β 同再生混凝土多因素之间关系的表达式．同时对再生混凝土柱的损伤量化标准进行了细分．最后将本文提出的损伤模型同另外两种模型作了比较．对比表明，本文所提出的损伤模型计算出来的损伤值标准差较小，离散性较低，能够更好地反映再生混凝土柱的累积损伤过程．

Research on Damage Evolution Model of Recycled Concrete Column under Cyclic Reversed Loading

Based on the analysis of the two existing concrete damage assessment model, a two-parameter seismic damage model regarding to stiffness degradation and cumulative energy dissipation is built to describe the damage cumulative evolution of recycled concrete columns under cyclic reversed loading. The reasonable values of model parameters and the relation between energy dissipation factor β and multi factors of recycled concrete are determined according to 24 sets of data from literature. At the same time, the damage quantification standard of recycled concrete column is classified. Finally, comparison is made with two other models mentioned in the literature. The results show that the standard deviation of damage calculated by the proposed damage evolution model for recycled concrete column is smaller and the dispersion is lower，indicating the advantage of the proposed model in describing the cumulative damage process of the recycled concrete columns.