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Damage‐sensitive impedance sensor placement on multi‐strand anchorage based on local stress variation analysis
Author(s) -
Dang NgocLoi,
Huynh ThanhCanh,
Pham QuangQuang,
Lee SoYoung,
Kim JeongTae
Publication year - 2020
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2547
Subject(s) - lead zirconate titanate , electrical impedance , breakage , structural engineering , materials science , stress (linguistics) , piezoelectricity , acoustics , finite element method , mechanical impedance , engineering , composite material , electrical engineering , optoelectronics , physics , dielectric , ferroelectricity , linguistics , philosophy
Summary 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.