Concrete internal damage evaluation method based on piezoelectric ceramic shear wave energy loss
A piezoelectric ceramics, energy loss technology, applied in measuring devices, processing response signals of detection, using sonic/ultrasonic/infrasonic waves to analyze solids, etc. For problems with high acquisition requirements, to achieve the effect of reducing interference, simple tools, and improving accuracy
Pending Publication Date: 2020-08-11
WUHAN UNIV OF TECH
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However, engineering practice shows that due to the influence of stress waves and noise, it is difficult to accurately determine the wave velocity. Due to the influence of AC voltage frequency and field noise, the amplitude error of the time domain signal is relatively large, and the signal acquisition requirements are high, which is difficult to achieve in the engineering site.
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[0015] This part will describe the specific embodiment of the present invention in detail, and the preferred embodiment of the present invention is shown in the accompanying drawings. Each technical feature and overall technical solution of the invention, but it should not be understood as a limitation on the protection scope of the present invention.
[0016] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
[0017] I...
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The invention discloses a concrete internal damage evaluation method based on piezoelectric ceramic shear wave energy loss. The method comprises: arranging a piezoelectric ceramic sensor on the surface of the concrete structure; monitoring the change of the shear wave after penetrating through the concrete structure; acquiring damage signals, converting the damage signal from a time domain signalinto a frequency domain signal for analysis; comparing the damage states of the measurement parts in different measurement stages with signal energy loss values in an intact state. When the damage signal energy value is calculated, the influence of low-frequency noise and high-frequency noise can be eliminated by selecting a frequency analysis range, interference is reduced, and the accuracy of crack position judgment is effectively improved. Meanwhile, tools applied to the method are simple, operation on an engineering site is facilitated, and the method is applied to the technical field of concrete structure health monitoring.
Description
technical field [0001] The invention relates to the technical field of concrete structure health monitoring, in particular to a concrete internal damage assessment method based on piezoelectric ceramic shear wave energy loss. Background technique [0002] Cracks have a major impact on the bearing capacity and durability of concrete structures. Cracks inside concrete are difficult to monitor. The size, development process and location of cracks inside are important indicators for judging the health of concrete structures. Therefore, how to accurately monitor cracks inside concrete has become an urgent problem to be solved. [0003] Piezoelectric ceramic sensors have both driving and sensing functions, and the technology of using them to monitor internal cracks in concrete structures has matured and been widely used in practice. At present, the application of piezoelectric ceramic sensors to monitor cracks is mainly based on the velocity change of the collected shear wave and...
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IPC IPC(8): G01N29/04G01N29/24G01N29/44
CPCG01N29/043G01N29/045G01N29/245G01N29/4409
Inventor 徐东升刘启超
Owner WUHAN UNIV OF TECH