修正的RC剪力墙构件Park-Ang损伤模型

基于Park-Ang 损伤模型，提出了用于钢筋混凝土剪力墙构件的修正损伤模型．通过对已有钢筋混凝土剪力墙试验结果的统计分析，总结了其累积耗能组合系数的影响因素，并拟合出该系数与试件参数：剪跨比、轴压比、配筋率的关系式．修正的损伤模型需满足加载至破坏时损伤指标为1.0 的上界条件，结果表明，根据本文修正的损伤模型计算的钢筋混凝土剪力墙试件损伤指标在统计意义上满足该条件．最后，根据构件性能水准的相关研究，本文将钢筋混凝土剪力墙构件的性能水准划分为：基本运行，生命安全和接近倒塌，分别对应了构件骨架曲线相应关键点：屈服点、峰值点和极限破坏点，根据本文修正损伤模型计算的各水准损伤指标临界值分别为：0.02、0.45 和1.00．

Application of Modified Park-Ang Damage Model to RC Shear Wall

Based on the Park-Ang damage model, a modified damage model applied to reinforced concrete (RC) shear wall was proposed. The calculation of the combined coefficient was discussed by statistical analysis of related test results of RC shear walls. Then a formula was obtained that relates the combined coefficient to the parameters of RC shear walls, i.e., the shear span ratio, the axial load ratio and the reinforcement ratio. The damage index at failure point which is calculated by the proposed modified damage model has a mean value near 1.0, satisfying the assumptions of the modification. Based on related researches on the performance levels of RC members, the performance of RC shear walls is classified into three levels: immediate occupancy, life safety and collapse prevention, which correspond to the critical points of the skeleton curves: yield point, peak point and failure point. The damage limits of each performance level are determined to be 0.02, 0.45 and 1.00, respectively.