The carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) has been increasingly attracting a widespread attention because of the advantages of using the excellent properties of nanomaterials to improve structural properties. An active sensing approach based on a piezoceramic transducer is developed to detect the interfacial debonding performance of CFRP-SNCB. A CFRP-SNCB specimen was fabricated and subjected to periodic loading test to initiate the debonding damage. Three piezoceramic smart aggregates (SAs) and three piezoceramic smart nanomaterial aggregates (SNAs) are embedded in the specimen and used as an actuator and sensor. Experiments show that the nanomaterial concrete becomes a good conduit for wave propagation due to the nucleation and filling effect of nanomaterial. The stress wave signal caused by the embedded SNAs is more sensitive to the debonding performance between CFRP and concrete than SA. The attenuation of stress wave caused by the increase of the severity of debonding damage can be clearly observed from the signals received from SAs and SNAs in the frequency domain analysis. The debonding cracking of the tension end region is earlier than the bond end region, which proves the starting point of structural debonding damage. Furthermore, the debonding state can be evaluated by wavelet packet analysis. The research results demonstrate that the proposed method has potentials to detect the interfacial debonding performance of CFRP-SNCB.

中文翻译：

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小波包分析的碳纤维布加固纳米材料混凝土梁的剥离性能

碳纤维增强聚合物（CFRP）增强的纳米材料混凝土梁（SNCB）由于利用纳米材料的优异性能改善结构性能的优势而日益引起人们的广泛关注。开发了一种基于压电陶瓷换能器的主动传感方法，以检测CFRP-SNCB的界面剥离性能。制作了CFRP-SNCB试样，并进行了定期载荷测试，以引发脱胶损伤。三种压电陶瓷智能聚集体（SA）和三种压电陶瓷智能纳米材料聚集体（SNA）嵌入样品中，并用作致动器和传感器。实验表明，由于纳米材料的成核和填充作用，纳米材料混凝土成为波传播的良好管道。与SA相比，由嵌入式SNA引起的应力波信号对CFRP与混凝土之间的剥离性能更为敏感。在频域分析中，从SA和SNA接收到的信号可以清楚地观察到由于脱粘损伤严重程度的增加而引起的应力波衰减。拉伸端部区域的脱开裂纹比粘合端部区域早，这证明了结构脱粘破坏的起点。此外，可以通过小波包分析来评估剥离状态。研究结果表明，该方法具有检测CFRP-SNCB界面剥离性能的潜力。在频域分析中，从SA和SNA接收到的信号可以清楚地观察到由于脱粘损伤严重程度的增加而引起的应力波衰减。拉伸端部区域的脱开裂纹比粘合端部区域早，这证明了结构脱粘破坏的起点。此外，可以通过小波包分析来评估剥离状态。研究结果表明，该方法具有检测CFRP-SNCB界面剥离性能的潜力。在频域分析中，从SA和SNA接收到的信号可以清楚地观察到由于脱粘损伤严重程度的增加而引起的应力波衰减。拉伸端部区域的脱开裂纹比粘合端部区域早，这证明了结构脱粘破坏的起点。此外，可以通过小波包分析来评估剥离状态。研究结果表明，该方法具有检测CFRP-SNCB界面剥离性能的潜力。剥离状态可以通过小波包分析来评估。研究结果表明，该方法具有检测CFRP-SNCB界面剥离性能的潜力。剥离状态可以通过小波包分析来评估。研究结果表明，该方法具有检测CFRP-SNCB界面剥离性能的潜力。