摘要
目的针对混凝土构件微裂缝损伤检测问题开展试验研究,以解决传统线性损伤识别方法敏感度和精度偏低等问题。方法在非线性振动声调制技术基础上,搭建了振动声调制试验平台并进行激励参数优化,研究混凝土梁在不同微裂缝损伤状态下的调制特性及规律。结果在优化激励参数试验中,高频和低频信号的频率对非线性调制效应的影响规律并不明显;非线性调制效应与高频信号幅值呈现线性正相关规律,而低频幅值存在激振力阈值。并且,在损伤识别过程中,该方法能够对损伤程度在0%~70%的混凝土梁有较好的识别敏感度。结论振动声调制技术所产生的非线性效应与裂缝开合过程中界面接触面积变化密切相关,从而有效解决了传统线性损伤识别技术对微裂缝识别不敏感问题。
A experimental study is performed for concrete member micro-crack detections to solve the problem of low sensitivity and accuracy using traditional linear damage identification methods.Based on the technology of nonlinear vibration and acoustic modulation(VAM),a VAM test platform is built,excitation parameters are optimized,and the modulation characteristics and laws of concrete beams under different micro-crack damage states are analyzed.The results show that in the experiment of optimizing excitation parameters,the frequency of high-frequency signal or low-frequency one has unobvious influence on the nonlinear modulation effect;the nonlinear modulation effect and the amplitude of the high-frequency signal has a linearly positive relationship.There is a threshold of the low-frequency excitation force.In the damage detection test,the side-frequency components in sensing signals are obvious for concrete beams with micro-cracks and the change law between the crack length and the nonlinear effect is relatively consistent.Moreover,in the process of damage identification,this method can have a good identification sensitivity for concrete beams with damage degrees between 0%and 70%.The nonlinear effect generated by VAM is closely related tothe change of the interface contact area during the crack opening and closing process,which effectively solves the problem that the traditional linear damage identification technology is insensitive to micro-crack identification.
作者
阎石
崔赛杰
王鲁
王雪南
于水旺
YAN Shi;CUI Saijie;WANG Lu;WANG Xuenan;YU Shuiwang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第3期385-392,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家重点研发计划项目(2017YFC1503106)。
关键词
振动声调制
调制边频
混凝土结构
闭合裂缝
压电陶瓷
vibration and acoustic modulation(VAM)
modulated side frequency
concrete members
closed cracks
piezoelectric ceramics
