In this study, a piezoelectric‐based interface technique for impedance measurement is presented to monitor local strand breakage in multi‐strand anchorage systems. Firstly, a hoop interface‐based impedance measurement model is designed based on stress behaviors of the multi‐strand anchorage. Coupled dynamic behaviors between the lead zirconate titanate (PZT) interface and the target tendon anchorage are interpreted to determine sensitive frequency ranges under local strand breakage. Next, a prototype of the PZT interface is designed to fit into the target multi‐strand anchorage to monitor the stress variations induced by local strand breakages. Dynamic characteristics of the PZT interface are numerically analyzed to sensitively catch impedance signals in predetermined frequency ranges. Finally, a series of damage scenarios are tested on a full‐scale multi‐strand anchorage system to evaluate the feasibility of the PZT interface for monitoring a series of strand‐breakage cases. Impedance responses of the PZT interface prototype are analyzed to determine damage‐sensitive frequency ranges. Linear tomography of root‐mean‐square‐deviation (RMSD) indices is utilized to localize damaged strands.

中文翻译：

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基于压电的箍式接口，用于预应力多股锚固中局部股断裂的阻抗监测

在这项研究中，提出了一种基于压电的阻抗测量接口技术，以监控多股锚固系统中的局部股断裂。首先，基于多股锚固的应力行为，设计了基于环界面的阻抗测量模型。锆钛酸铅（PZT）界面与目标肌腱锚固之间的耦合动力学行为被解释为确定局部股断裂下的敏感频率范围。接下来，设计PZT接口的原型以适合目标多股锚固，以监视由局部股断裂引起的应力变化。对PZT接口的动态特性进行了数值分析，以灵敏地捕获预定频率范围内的阻抗信号。最后，在完整的多链锚固系统上测试了一系列破坏情景，以评估PZT接口用于监视一系列断链情况的可行性。分析了PZT接口原型的阻抗响应，以确定对损伤敏感的频率范围。均方根偏差（RMSD）指数的线性层析成像用于定位受损的钢绞线。