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利用水平低周反复加载试验与声发射监测技术,开展了受弯钢筋混凝土(RC)柱的宏/微观地震损伤演化试验研究。根据试件损伤演化过程和破坏特征,确定了其损伤性能点,并与已有试验研究结果对比,分析了各性能点对应的位移角。利用Park-Ang损伤模型,依据PEER数据库55根RC柱的试验结果,统计并分析了概率损伤性能水准。声发射信号参数分析表明:累积计数率比曲线和累积能量率比曲线与Park-Ang损伤曲线之间具有较好一致性,基于三者拟合曲线之间的关系,可得到声发射评估模型的表达式,其评估结果符合概率损伤性能水准;声发射b值曲线演化特征与试件损伤演化特征相一致,b值曲线的发展趋势能够反映试件的宏观和微观损伤演化过程。
Using horizontal low cycle repeated loading test and acoustic emission monitoring technique, the macro / micro earthquake damage evolution of RC columns was studied. According to the damage evolution and damage characteristics of the specimen, the damage performance points were determined. Compared with the existing experimental results, the displacement angle corresponding to each performance point was analyzed. Based on the Park-Ang damage model and the test results of 55 RC columns in the PEER database, the level of probability damage performance was calculated and analyzed. Acoustic emission signal parameter analysis shows that there is a good agreement between the cumulative ratio curve and the cumulative energy ratio curve and the Park-Ang damage curve. Based on the relationship between the fitting curves, the acoustic emission assessment model The evaluation results accord with the performance level of probability damage. The evolvement characteristics of acoustic emission b value curve are consistent with the damage evolution characteristics of specimen, and the development tendency of b value curve can reflect the macro and micro damage evolution process of specimen.