Abstract
This study investigates the dynamic characteristics of a smart PZT interface mounted on a prestressed anchorage to verify the numerical feasibility of the admittance-based anchor force monitoring technique. Firstly, the admittance-based anchor force monitoring technique through a single-mount PZT interface is outlined. The admittance response of the PZT interface-anchorage system is theoretically derived to show the proof-of-concept of the technique for anchor force monitoring. Secondly, a finite element model corresponding to a well-established experimental model in the literature is constructed. The effect of anchor force is equivalently treated by the contact stiffness and damping parameters at the bottom surface of the anchorage. Thirdly, the admittance and the impedance responses are numerically analyzed and compared with the experimental data to evaluate the accuracy of the numerical modelling technique. Fourthly, the local dynamics of the PZT interface are analyzed by modal analysis to determine vibration modes that are sensitive to the change in the contact stiffness (i.e., representing the anchor force). Finally, the admittance responses corresponding to the sensitive vibration modes are numerically analyzed under the change in the contact stiffness. The frequency shift and the admittance change are quantified by statistical damage indices to verify the numerical feasibility of the anchor force monitoring technique via the smart PZT interface. The study is expected to provide a reference numerical model for the design of the single-point mount PZT interface.
Highlights
To demonstrate the numerical feasibility of the single-point mount smart interface for anchor force monitoring, there is a need to identify the local vibration modes of the interface that are identical to the resonant peaks and to prove that the frequency of those modes is changed by the change in the anchor force
The numerical modeling and local dynamic characteristics of a singlepoint mount PZT interface on a prestressed anchorage were investigated to show the numerical feasibility of the anchor force monitoring technique
The local dynamics of the PZT interface were analyzed by the modal analysis approach to determine the sensitive vibration modes
Summary
The single-point mount PZT interface was successfully tested for anchor force monitoring of a lab-scaled cable-anchorage system, its feasibility should be verified by numerical simulation. PZT interface mounted on a prestressed anchorage for admittance-based anchor force monitoring. The second section outlines the admittance-based technique through a single-mount PZT interface, including the design of an interface prototype and the proof-of-concept of the technique for anchor force monitoring. The section describes the numerical simulation of the previous experimental model of the PZT interface-anchorage system in literature [25], the technique for anchor force monitoring. The fourth section investigates the local dynamic responses of the PZT interface and verifies the numerical feasibility of the admittance-based anchor force monitoring techand comparesand theconclusion numerical of admittance with the experimental data. A summary and conclusion of this study are presented in the final section
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