Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China.
Wuhan Institute of Earthquake Engineering Co., Ltd., Wuhan 430071, China.
Sensors (Basel). 2019 Dec 19;20(1):41. doi: 10.3390/s20010041.
Carbon fiber reinforced polymer (CFRP) plates are widely used to retrofit or reinforce steel structures, and the debonding damage between the steel structure and the CFRP plate is a typical failure in strengthening steel structures. This paper proposes a new approach to detecting debonding between a steel beam and a reinforcing CFRP plate by using removable lead zirconate titanate (PZT)-based transducers and active sensing. The removable PZT-based transducers are used to implement the active sensing approach, in which one transducer, as an actuator, is used to generate stress wave, and another transducer, as a sensor, is used to detect the stress wave that propagates across the bonding between the steel beam and the reinforcing CFRP plate. The bonding condition significantly influences the received sensor signal, and a wavelet-packet-based energy index (WPEI) is used to quantify the energy of the received signal to evaluate the severity of debonding between the steel beam and the reinforcing CFRP plate. To validate the proposed approach, experimental studies were performed, and two removable PZT-based transducers were designed and fabricated to detect the debonding between a steel beam and the reinforcing CRFP plate. The experimental results demonstrate the feasibility of the proposed method in detecting the debonding between a steel beam and the reinforcing CFRP plate using removable PZT-based transducers.
碳纤维增强聚合物（CFRP）板广泛用于修复或加固钢结构，而钢结构与 CFRP 板之间的脱粘损伤是加固钢结构的一种典型失效模式。本文提出了一种利用可移动锆钛酸铅（PZT）基换能器和主动传感技术检测钢梁与加固 CFRP 板之间脱粘的新方法。可移动 PZT 基换能器用于实现主动传感方法，其中一个换能器作为激励器用于产生应力波，另一个换能器作为传感器用于检测在钢梁和加固 CFRP 板之间的粘结处传播的应力波。粘结状态对接收传感器信号有显著影响，因此采用基于小波包的能量指数（WPEI）来量化接收信号的能量，以评估钢梁和加固 CFRP 板之间脱粘的严重程度。为了验证所提出的方法，进行了实验研究，并设计和制造了两个可移动 PZT 基换能器来检测钢梁和加固 CFRP 板之间的脱粘。实验结果表明，该方法利用可移动 PZT 基换能器检测钢梁和加固 CFRP 板之间脱粘的可行性。
