作者：顾爱军1, 关庆圆2, 徐波1, 苏铭1, 李非凡1
作者单位：1. 扬州大学水利科学与工程学院，江苏 扬州 225009;
2. 淮安市水利勘测设计研究院有限公司，江苏 淮安 223005
关键词：钢筋混凝土梁;声发射;b值;断层总面积
摘要：
为研究钢筋混凝土构件破坏过程中的声发射特性，对钢筋混凝土梁进行四点弯曲加载破坏试验，利用声发射技术对破坏过程进行监测。为综合考虑声发射信号的事件数、幅度和能量等因素所反映的损伤特性，引用地震学领域的断层总面积理论与声发射b值理论进行联合表征。断层总面积反映事件数和能量的关系，声发射b值反映事件数和幅度的关系，两者的结合可以更好地反映钢筋混凝土梁的破坏规律。实验表明，该损伤表征方法可进一步提升对混凝土结构损伤预警识别的精准性，从而在实际工程运用声发射技术进行损伤识别和预警提出合理的声发射信号监测方法。
damage characterization of reinforced concrete beams based on total acoustic emission fault area and b-value
gu aijun1, guan qingyuan2, xu bo1, su ming1, li feifan1
1. college of hydraulic science and engineering, yangzhou university, yangzhou 225009, china;
2. huai’an water conservancy survey and design institute co., ltd., huai’an 223005, china
abstract: in order to study the acoustic emission characteristics of reinforced concrete members in the failure process, the four-point bending loading failure test of reinforced concrete beams was carried out, and the failure process was monitored by acoustic emission technique. to comprehensively consider the damage characteristics reflected by the number of events, amplitude and energy of acoustic emission signals, the total fault area theory and acoustic emission b-value theory in seismology field are cited for joint characterization. the total fault area reflects the relationship between the number of events and energy. the acoustic emission b-value reflects the relationship between the number of events and amplitude. the combination of the two can better reflect the failure law of reinforced concrete beams. the experiment shows that the damage characterization method can further improve the accuracy of damage early warning and identification of concrete structures, so as to put forward a reasonable acoustic emission signal monitoring method for the damage identification and early warning by using acoustic emission technique in practical engineering.
keywords: reinforced concrete beam;acoustic emission;b-value;total fault area
2024, 50(7):147-154,198 收稿日期: 2022-05-28;收到修改稿日期: 2022-08-04
基金项目: 国家自然科学基金资助项目(52079120)
作者简介: 顾爱军（1968-），男，江苏泰州市人，副教授，博士，研究方向为固体力学、无损检测方法、声发射技术。
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