In order to solve the problem of crack repair of defective concrete members,the repair quality can not be accurately judged by appearance inspection only,and there is a lack of efficient and standardized nondestructive testing means.By pre-embedding piezoelectric ＂smart aggregate＂in the structure,the difference of stress wave transmitting and receiving signals in different media conditions is compared and analyzed,and the relevant knowledge of signal pro-cessing technology is applied to study the signal changes generated in different stages of crack repair,and thus evaluate the quality of crack repair.The research results show that the depth of concrete cracks has a great influence on the stress wave shape received by the receiving end of ＂smart aggregate＂.Through time domain analysis of the received signals,and then energy analysis after wavelet packet decomposition,it is found that even if the initial crack depth is different,the repaired components will have similar energy values.In this method,the evaluation index of crack repair quality based on wavelet packet energy is feasible.
关键词
压电智能骨料/Lamb波/裂缝修补质量/小波包分解/能量指标分析
Key words
piezoelectric intelligent aggregate/Lamb wave/mending quality of cracks/wavelet packet decom-position/energy index analysis
维普
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