An important issue in impedance‐based damage monitoring is to deploy sensors in proper positions in which damage‐sensitive impedance responses can be captured effectively. In this study, a full‐scale multi‐strand anchorage is analyzed to determine optimal locations of piezoelectric sensors for impedance‐based monitoring of locally damaged strands. First, stress variations of the multi‐strand anchorage are experimentally measured to estimate the anchorage behavior under the effect of locally damaged strands. Strain signals are examined for axial, circumferential, and radial stress components under the variation of prestress forces. Second, a finite element analysis is made on the multi‐strand anchorage to back up the experimental findings. Third, a damage‐sensitive structural model is interpreted for the local strand breakage. Finally, impedance responses sensitive to local strand breakage are experimentally examined for a few scenarios simulated in the anchorage system. PZT (lead zirconate titanate) sensors deployed on the anchor head and the bearing plate are evaluated to comparatively determine ideal regions of interest for impedance monitoring. The results show that the greater stress variation yields the greater variations in impedance responses and the near‐top and near‐anchor heads are ideal regions of interest for damage‐sensitive impedance monitoring.

中文翻译：

---

基于局部应力变化分析的损伤敏感阻抗传感器在多股锚固上的位置

基于阻抗的损坏监视中的一个重要问题是将传感器部署在适当的位置，在这些位置可以有效捕获对损坏敏感的阻抗响应。在本研究中，分析了全方位多股锚固，以确定用于基于阻抗的局部损坏股监测的压电传感器的最佳位置。首先，通过实验测量多股锚固的应力变化，以估计在局部损坏的钢绞线作用下的锚固行为。在预应力变化的情况下，检查应变信号的轴向，圆周和径向应力分量。其次，对多股锚固进行有限元分析以支持实验结果。第三，针对局部链断裂解释了损伤敏感的结构模型。最后，对于锚固系统中模拟的几种情况，通过实验检查了对局部链断裂敏感的阻抗响应。评估部署在锚头和轴承板上的PZT（钛酸锆钛酸铅）传感器，以比较确定用于阻抗监测的理想目标区域。结果表明，更大的应力变化会产生更大的阻抗响应变化，并且近顶和近锚头是损伤敏感阻抗监测的理想目标区域。