A Convenient Sensitivity Calibration Method for Piezoelectric Smart Aggregates for Shear Stress
Significant shear damage has been observed in numerous concrete structures during earth-quakes,highlighting the necessity of monitoring shear stress in concrete.Piezoelectric smart aggregate sensors for monitoring shear stress,utilizing PZT piezoelectric ceramics as sensitive sensing ele-ments,have been proven by researchers to effectively monitor the internal shear stress of concrete.However,current sensitivity calibration tests for piezoelectric smart aggregates for shear stress rely on high-precision loading equipment or large structural components,resulting in complex testing proce-dures,high costs,and non-reusability of sensors after calibration.First,this study proposed a conve-nient calibration method for sensitivity of piezoelectric smart aggregates for shear stress based on cy-clic loading using a pendulum device.Furthermore,the influence of loading position variation and out-of-plane movement of the pendulum on sensitivity calibration was investigated through finite element analysis and experimental methods.Finally,the sensitivity of a batch of piezoelectric smart aggregates for shear stress was calibrated using this method and compared with the sensitivity obtained through high-precision loading.This research is of great significance for improving the accuracy of shear stress monitoring in concrete structures.
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