Intelligent steel bar based on piezoelectric ceramic crystal and its manufacturing method

Abstract

The invention provides an intelligent reinforcing steel bar based on piezoelectric ceramic crystals and a fabrication method thereof. The intelligent reinforcing steel bar comprises a reinforcing steel bar, piezoelectric ceramic crystal sheets and epoxy resin containing silver, wherein the piezoelectric ceramic crystal sheets are symmetrically arranged along the long direction of the reinforcing steel bar and fixed on the reinforcing steel bar through the epoxy resin containing the silver; part of piezoelectric ceramic crystal sheet are taken as signal drivers; the rest of the piezoelectric ceramic crystal sheets are taken as sensors; a five-waveform narrowband instantaneous ultrasonic wave is added to each piezoelectric ceramic crystal sheet as the signal driver as an input signal; a corresponding output signal is obtained from each piezoelectric ceramic crystal sheet as the sensor; whether the concrete in an area between the adjacent driver and sensor has a crack or decortication phenomenon is judged according to the size of the signals. By adopting the intelligent reinforcing steel bar, the local damage to the concrete structure is predicted by changes of loaded guide stress waveform scattering variation and wave duration and amplitude; as one part of a bearing material, the intelligent reinforcing steel bar is arranged at any required part of a large structure, and has great flexibility.

Description

technical field [0001] The invention relates to safety detection and evaluation of reinforced concrete building structures, and is a kind of non-destructive detection of structures. Specifically, it relates to an intelligent steel bar based on piezoelectric ceramic crystals and a manufacturing method thereof. Background technique [0002] It is an important task to carry out regular health monitoring of reinforced concrete buildings, and timely structural safety inspection and assessment of key buildings after a catastrophe. Commonly used damage detection methods for concrete structures include visual inspection (plus microscope), echo method (ImpactEcho), ultrasonic pulse, ultrasonic scanning methods such as C-scan, or X-ray scanning, etc. These methods require inspectors to visit the site for inspection. However, due to the large size of such structures, the key load-bearing parts are either covered by decorative walls or difficult to access, such as beams, columns and the...

AI Technical Summary

Problems solved by technology

Internationally, Ayres et al. and Soh et al. attached PZT sensors to the surface of structures such as bridge beams and columns, and tested the damage by measuring piezoelectric impedance. This method is sensitive to local damage in the sensing area, but not to far-field damage, so For large civil structures, it is difficult to detect the damage deep inside the components

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