Ultrasonic transducer-based mechanical damage and rust damage detection of steel bars and comparative study
Ultrasonic guided wave inspection technology has the advantages of less detection time and wide coverage.In order to detect the damage of reinforcing steel in reinforced concrete structures,the ultrasonic transducer was used to study the effect of mechanical damage at different depths and locations on the propagation of the ultrasonic wave guide.The relationship between the degree of damage and the wave guide characteristics was established.The degree of damage was quantified by the reflection coefficient C,and the location of the damage was determined by combining the reflected echo of the damage.The actual L-wave velocities were 4 738.1 m·s-1 and 5 069.7 m·s-1 when the corrosion level reached the maximum in the spot corrosion and uniform corrosion damage detection,respectively,which could be distinguished from the mechanical damage.Finally,the wavelet transform-based time-frequency analysis was used to determine the damage condition.The results of this study can be used as a reference for rebar damage detection.
NETL
NSTL
万方数据
维普
