锈蚀钢筋混凝土梁加载过程中声发射信号特征  

Acoustic Emission(AE)Characteristics of Corroded Reinforced Concrete Beams in Loading Process

作　　者：王磊 钟立恒[2] 夏海龙 张鑫[2] 

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《建筑材料学报》2016年第4期682-687,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51268009);广西矿冶与环境科学实验室中心项目(KH2011ZD007)

摘　　要：对不同锈蚀率下钢筋混凝土梁的加载破坏过程进行了声发射试验,研究了声发射事件定位结果与梁构件裂缝开展位置的对应关系及声发射信号特征.结果表明:对于不同锈蚀率下的钢筋混凝土梁,声发射事件定位结果与裂缝位置具有较好的对应性,利用声发射技术对缺陷源进行定位是可行的,并且可根据声发射事件数量的增长情况来判断梁构件的受力阶段;随着应力水平的增大,钢筋混凝土梁声发射信号频段中心由低频向高频转移;随着钢筋锈蚀率的增大,钢筋混凝土梁在破坏过程中的声发射事件数量减少,其释放的总能量降低.Acoustic emission（AE） analysis on loading process of corroded reinforced concrete beams with different corrosion ratios was carried out at different stress levels. The characteristics of AE signal and the relationship between the AE event location and crack location of the specimens were studied. Results show that the AE event location has good correspondence with the crack location for all the specimens. Therefore it is feasible to determine defect location of corroded reinforced concrete beams by AE tech- nique. Meanwhile, the stress stage of the specimens can be judged based on the growth for number of AE events. With the increase of stress level, the average frequency center of the specimens will be shif- ted from low frequency to high frequency. With the increase of the corrosion ratio, the number of AE e- vents in the damage process of the specimens will decrease and the total energy of the specimens will de- crease.

关 键 词：声发射 钢筋混凝土 锈蚀率 平均频率 能量 

分 类 号：TU528.571[建筑科学—建筑技术科学]