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Quantitative detection method for absolute size of concrete crack based on Rayleigh wave energy attenuation

A technology of energy attenuation and detection method, which is applied in the direction of measuring device, using sound wave/ultrasonic wave/infrasonic wave to analyze solids, using sound wave/ultrasonic wave/infrasonic wave to analyze materials, etc. It can solve the problem that the absolute size and shape of damage cannot be given, and achieve Strong universality and detection accuracy, and broad engineering application prospects

Inactive Publication Date: 2021-08-31
上海交通大学设计研究总院有限公司
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Problems solved by technology

However, the damage factor in the traditional method represents the relative severity of the damage relative to the initial state of the structure, and cannot give detailed information such as the absolute size and shape of the damage.

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  • Quantitative detection method for absolute size of concrete crack based on Rayleigh wave energy attenuation
  • Quantitative detection method for absolute size of concrete crack based on Rayleigh wave energy attenuation
  • Quantitative detection method for absolute size of concrete crack based on Rayleigh wave energy attenuation

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Embodiment Construction

[0033] Below according to the accompanying drawings Figure 1 ~ Figure 4 , give a preferred embodiment of the present invention, and give a detailed description, so that the functions and characteristics of the present invention can be better understood.

[0034] see figure 1 , a quantitative detection method for the absolute size of concrete cracks based on Rayleigh wave energy attenuation in an embodiment of the present invention is based on figure 1 The concrete surface crack absolute size quantification detection system shown; the system is a concrete to be tested 1, at least one distributed PZT system information source 2, a data acquisition system 3 and a computing terminal 4; the distributed PZT system information source 2 is pasted on The concrete 1 to be tested is connected to the information source 2 of the distributed PZT system; the information source 2 of the distributed PZT system is connected to the data acquisition system 3 and the computing terminal 4 .

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Abstract

The invention provides a quantitative detection method for the absolute size of a concrete crack based on Rayleigh wave energy attenuation. The method comprises the following steps: S1, constructing a Rayleigh wave energy attenuation physical model by considering material and geometric attenuation at the same time; s2, calculating an energy attenuation ratio RA; s3, carrying out positioning, absolute size quantification and shape description of reflection points of the crack tip and the crack middle section of the concrete surface based on an improved semi-infinite space damage positioning method, and determining the positions of the crack tip and the crack middle section and the crack size and direction according to the tangent or crossed geometrical relationship of the reflection points and a positioning ellipse. According to the concrete crack absolute size quantitative detection method based on Rayleigh wave energy attenuation, on the basis of position information of crack tips and crack middle sections given by an energy attenuation model and an improved damage positioning method, detail information of more complex damage can be described with fewer sensors; and the relative dimension quantization detection system is updated to an absolute dimension quantization detection system.

Description

technical field [0001] The invention relates to the field of quantitative detection of concrete surface cracks, in particular to a quantitative detection method for the absolute size of concrete cracks based on Rayleigh wave energy attenuation. Background technique [0002] In my country's infrastructure projects, such as plateau railways, tunnels, deep-sea buildings, nuclear islands, etc., concrete is one of the most important forms of composition. During its use, due to the influence of unfavorable factors such as environment and load, fatigue effect, corrosion effect and material aging, the structure will produce damage accumulation, resistance attenuation, and even lead to sudden accidents, resulting in huge loss of life and property. Therefore, on the basis of structural health testing, it is of great significance to conduct intelligent quantitative non-destructive testing for material performance degradation, cracks, leakage, erosion and other common diseases in concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/11
CPCG01N29/041G01N29/11G01N2291/0232G01N2291/0289G01N2291/0423G01N2291/103
Inventor 乔丕忠余海帆陆林军
Owner 上海交通大学设计研究总院有限公司
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