预应力碳纤维条带加固混凝土圆柱的地震损伤模型

为了研究预应力碳纤维条带加固混凝土圆柱的地震损伤性能，利用包括对比柱在内的13根混凝土圆柱试验数据，对修正的Park-Ang损伤模型进行改进，建立了预应力碳纤维条带加固混凝土圆柱的地震损伤模型;根据试件的轴压比、纵向配筋率、考虑了预应力碳纤维条带及箍筋的双重横向约束作用对组合参数进行非线性回归分析，得到了该文推荐模型中组合参数的经验表达式;基于所提出的地震损伤模型，计算出了不同损伤状态的特征点所对应的地震损伤指标，据此给出了预应力CFRP加固混凝土圆柱的抗震分级标准;有限元分析得到的CFRP加固混凝土圆柱的损伤指标与试验结果基本符合，证明了该损伤模型以及加固柱的抗震等级划分标准的合理性。

SEISMIC DAMAGE MODEL OF CIRCULAR REINFORCED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP STRIPS

To study the seismic damage behavior of circular reinforced concrete columns strengthened with pre-stressed Carbon Fiber Reinforced Polymer (CFRP) strips, the Park-Ang damage model was modified by studying the test data of 13 RC columns, and then the seismic damage model of circular concrete columns strengthened with pre-stressed CFRP strips was established. According to the nonlinear regression analysis of axial load ratio, longitudinal reinforcement ratio and double transverse confinement from pre-stressed CFRP strips and stirrups, the experienced expression of the combination parameter of the recommended model was proposed. Based on the recommended model, damage indexes corresponding with the feature points of different damage statuses were calculated, and then the criteria for the classification of seismic performance levels for reinforced concrete circular columns strengthened with pre-stressed CFRP were concluded. The finite element analysis results of the damage indexes showed good agreement with the experiment results, which indicates the rationality of the recommended damage model and the classification standards for reinforced concrete circular columns strengthened with pre-stressed CFRP.