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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Real-Time Monitoring of Bond Slip between GFRP Bar and Concrete Structure Using Piezoceramic Transducer-Enabled Active Sensing
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Real-Time Monitoring of Bond Slip between GFRP Bar and Concrete Structure Using Piezoceramic Transducer-Enabled Active Sensing

机译：使用压电陶瓷换能器主动感应实时监测GFRP筋和混凝土结构之间的粘结滑移

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摘要

Glass fiber-reinforced polymers (GFRPs) have received increasing attention in recent years due to their overall performance of light weight, low cost and corrosion resistance, and they are increasingly used as reinforcement in concrete structures. However, GFRP material has low elastic modulus and linear elastic properties compared with steel bars, which introduces different bonding characteristics between bars and concrete. Therefore, a reliable monitoring method is urgently needed to detect the bond slip in GFRP-reinforced concrete structures. In this paper, a piezoceramic-based active sensing approach is proposed and developed to find the debonding between a GFRP bar and the concrete structure. In the proposed method, we utilize PZT (lead zirconate titanate) as two transducers. One acts as an actuator which is buried in the concrete structure, and the other acts as a sensor which is attached to the GFRP bar by taking advantage of machinability of the GRRP material. Both transducers are strategically placed to face each other across from the interface between the GFRP bar and the concrete. The actuator provokes a stress wave that travels through the interface. Meanwhile, the PZT patch that is attached to the GFRP bar is used to detect the propagating stress wave. The bonding condition determines how difficult it is for the stress wave traveling through the interface. The occurrence of a bond slip leads to cracks between the bar and the concrete, which dramatically reduces the energy carried by the stress wave through the interface. In this research, two specimens equipped with the PZT transducers are fabricated, and pull-out tests are conducted. To analyze the active sensing data, we use wavelet packet analysis to compute the energy transferred to the sensing PZT patch throughout the process of debonding. Experimental results illustrate that the proposed method can accurately capture the bond slip between the GFRP bar and the concrete.
机译：近年来，由于玻璃纤维增​​强聚合物（GFRP）的轻量，低成本和耐腐蚀性能，因此受到越来越多的关注，并且越来越多地用作混凝土结构的增强材料。但是，GFRP材料与钢筋相比具有较低的弹性模量和线性弹性，这在钢筋和混凝土之间引入了不同的粘结特性。因此，迫切需要一种可靠的监测方法来检测GFRP增强混凝土结构的粘结滑移。本文提出并开发了一种基于压电陶瓷的主动传感方法，以发现GFRP筋与混凝土结构之间的剥离。在提出的方法中，我们利用PZT（钛酸锆钛酸铅）作为两个传感器。一个用作埋在混凝土结构中的致动器，另一个用作通过利用GRRP材料的可加工性而连接到GFRP杆的传感器。从表面上看，两个换能器在玻璃纤维增​​强筋和混凝土之间的界面对面彼此相对放置。执行器产生一个应力波，该应力波通过界面传播。同时，附着在GFRP杆上的PZT贴片用于检测传播的应力波。结合条件决定了应力波穿过界面的困难程度。粘结滑移的出现会导致钢筋和混凝土之间产生裂缝，从而大大降低应力波通过界面传递的能量。在这项研究中，制造了两个装有PZT传感器的标本，并进行了拉拔测试。为了分析活动的感应数据，我们使用小波包分析来计算在整个脱粘过程中传递到感应PZT贴片的能量。实验结果表明，所提出的方法可以准确地捕获玻璃纤维增​​强筋与混凝土之间的粘结滑移。

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