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<p>In-situ deformation detection in laminated high damping rubber bearings (HDRBs) is a challenging experimental mechanics task particularly when using a non-intrusive approach. One potential application of such task is the management of the in-service HDRBs in base-isolated civil infrastructures. This article examined the potential of the Electro-Mechanical Admittance (EMA) method to provide an identification of shear deformation levels in HDRBs by using piezoelectric ceramic (PZT). A novel electro-mechanical coupling model that integrated structural mechanical impedance with two-spring model theory was proposed to analytically resolve the correlation between the EMA spectrums and vertical stiffness/damping associated to shear deformations in the HDRB, which was further validated by generating a full-scaled three-dimensional finite element (FE) model and performing experimental tests on an identical HDRB subjected to different shear deformations from 0% to 60% and constant compressive stress of 12 MPa. Theoretical, numerical and experimental investigations consistently revealed that the resonant peaks in the EMA signatures of PZT transducers bonded on the rubber layer exhibited gradual reduction of the resonance frequency accompanied with magnitude increase with increasing shear deformations, while that of the transducers bonded on steel end plate behaved inverse characteristics. Extraction of the resonance parameters favorably confirmed the EMA signatures as a linear function of the shear deformations in the HDRB, thus providing quantifiable estimation. Comparing to traditional disassembly, acoustic emission and wave-based methods, the developed model offered an accurate, low-costive and non-invasive tool for assessing the deformative levels of in-situ HDRBs in base-isolated structures.</p>

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Shear Deformation Identification of Laminated High Damping Rubber Bearings using Electro-Mechanical Coupled Model of Bonded PZT Transducers: Modeling, Simulation and Experimentation

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Demi Ai,
  • Aoqiu Zhou,
  • Hedong Li

摘要

In-situ deformation detection in laminated high damping rubber bearings (HDRBs) is a challenging experimental mechanics task particularly when using a non-intrusive approach. One potential application of such task is the management of the in-service HDRBs in base-isolated civil infrastructures. This article examined the potential of the Electro-Mechanical Admittance (EMA) method to provide an identification of shear deformation levels in HDRBs by using piezoelectric ceramic (PZT). A novel electro-mechanical coupling model that integrated structural mechanical impedance with two-spring model theory was proposed to analytically resolve the correlation between the EMA spectrums and vertical stiffness/damping associated to shear deformations in the HDRB, which was further validated by generating a full-scaled three-dimensional finite element (FE) model and performing experimental tests on an identical HDRB subjected to different shear deformations from 0% to 60% and constant compressive stress of 12 MPa. Theoretical, numerical and experimental investigations consistently revealed that the resonant peaks in the EMA signatures of PZT transducers bonded on the rubber layer exhibited gradual reduction of the resonance frequency accompanied with magnitude increase with increasing shear deformations, while that of the transducers bonded on steel end plate behaved inverse characteristics. Extraction of the resonance parameters favorably confirmed the EMA signatures as a linear function of the shear deformations in the HDRB, thus providing quantifiable estimation. Comparing to traditional disassembly, acoustic emission and wave-based methods, the developed model offered an accurate, low-costive and non-invasive tool for assessing the deformative levels of in-situ HDRBs in base-isolated structures.