基于阻抗的多股锚固系统中局部断丝检测的应力监测方法-可行性研究。

Local Strand-Breakage Detection in Multi-Strand Anchorage System Using an Impedance-Based Stress Monitoring Method-Feasibility Study.

机构信息

Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.

出版信息

Sensors (Basel). 2019 Mar 1;19(5):1054. doi: 10.3390/s19051054.

DOI:10.3390/s19051054

PMID:30832237

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6427572/

Abstract

This study investigates the feasibility of impedance-based stress monitoring method for local-strand breakage detection in multi-strand anchorage systems. Firstly, stress fields of a multi-strand anchorage system are numerically analyzed to examine anchorage's responses sensitive to local strand breakage. Secondly, an impedance-based stress monitoring technique via the PZT interface is outlined. Thirdly, a novel hoop-type PZT interface is designed for the multi-strands anchorage to monitor the stress variation induced by the strand breakage. Local dynamic responses of the hoop-type PZT interface are analyzed to predetermine the effective frequency ranges. Finally, the numerical feasibility of the proposed method is verified on a seven-strand anchorage system under various strand breakage cases. Variations in impedance responses are statistically quantified, and broken strands are localized by linear tomography analysis of damage indices. A lab-scale experiment is also conducted on a multi-strands anchorage to evaluate the realistic performance of the hoop PZT interface for impedance-based stress monitoring method.

摘要

本研究探讨了基于阻抗的应力监测方法在多股锚固系统局部断丝检测中的可行性。首先，通过数值分析来研究多股锚固系统中的应力场，以检验锚固系统对局部断丝的响应敏感性。其次，概述了通过 PZT 界面的基于阻抗的应力监测技术。第三，设计了一种新型的环式 PZT 界面，用于多股锚固，以监测由断丝引起的应力变化。分析环式 PZT 界面的局部动态响应，以预先确定有效的频率范围。最后，在各种断丝情况下，对七股锚固系统进行数值可行性验证。通过对损伤指标的线性层析成像分析，对阻抗响应的变化进行了统计量化，并对断丝进行了定位。还在多股锚固上进行了实验室规模的实验，以评估环式 PZT 界面用于基于阻抗的应力监测方法的实际性能。