CAJ | 학술논문

采用声发射技术对混凝土试件在变幅循环轴拉荷载作用下的损伤破坏过程所伴生的声发射信号进行采集，分析混凝土的凯塞效应及典型声发射特性。结果表明：声发射凯塞效应和费利希蒂效应过渡的加载阶段约有62％极限应力，此临界点可作为混凝土轴拉裂缝发展稳定与否的标志；声发射振铃数、声发射ASL平均值和声发射幅度均呈现出随着加载阶段的延续而增加的趋势。相关结果可以作为预测混凝土结构安全和损伤程度的依据。
채용성발사기술대혼응토시건재변폭순배축랍하재작용하적손상파배과정소반생적성발사신호진행채집，분석혼응토적개새효응급전형성발사특성。결과표명：성발사개새효응화비리희체효응과도적가재계단약유62％겁한응력，차림계점가작위혼응토축랍렬봉발전은정여부적표지；성발사진령수、성발사ASL평균치화성발사폭도균정현출수착가재계단적연속이증가적추세。상관결과가이작위예측혼응토결구안전화손상정도적의거。
Acoustic emission ( AE ) signals associated with the damage processes of concrete specimens under variable amplitude cyclic tension loading were obtained using acoustic emission techniques .The Kaiser effect and typical AE characteristics of the concrete damage processes were analyzed .The results show that the conversion loading stage between the Kaiser effect and Felicity effect was at 62%ultimate stress;this critical point can be used as a sign of a critical state for concrete micro-cracks under uniaxial tension during the stable or unstable development .The AE count number , the average ASL voltage , and the AE amplitude all showed an increasing trend with the extension of the loading stage .The research results can provide a basis for prediction of the structural safety and damage degree of concrete .