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Device and method for nondestructively testing axial stress of concrete member based on nonlinear ultrasonic harmonic wave method

A non-linear ultrasonic and axial stress technology, applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve the relationship of stress that cannot be determined, and the accuracy needs to be improved , complex detection process and other issues, to achieve the effect of low cost, simple structure and high precision

Active Publication Date: 2018-06-15
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Application Information

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Problems solved by technology

[0008] For example, CN104655727A discloses a concrete non-destructive testing equipment based on nonlinear second harmonic theory, which consists of an ultrasonic testing system, a motorized system, a data wireless transmission system and a computer terminal, but it cannot determine the acoustic parameters and Stress relationship in concrete members
[0009] CN107063526A discloses a method for detecting the absolute stress distribution of steel components based on critical refraction longitudinal waves, by calibrating the stress-acoustic time difference coefficient of critical refraction longitudinal waves on a set of sound paths of steel components, but the detection process is complicated and the accuracy needs to be improved

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  • Device and method for nondestructively testing axial stress of concrete member based on nonlinear ultrasonic harmonic wave method
  • Device and method for nondestructively testing axial stress of concrete member based on nonlinear ultrasonic harmonic wave method
  • Device and method for nondestructively testing axial stress of concrete member based on nonlinear ultrasonic harmonic wave method

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Embodiment 1

[0069] Example 1 The non-destructive detection of the device composition test method and related principles of the non-destructive detection of the average axial stress inside the concrete member by the nonlinear ultrasonic harmonic method of the present invention

[0070] The principle of the non-destructive testing method for the internal initial stress of concrete members based on the nonlinear ultrasonic harmonic method is as follows.

[0071] In the elastic range, the relationship between the stress and strain inside the concrete material is generally considered to be a linear relationship, which is the familiar Hooke's law. However, when the finite-amplitude sound wave propagates in the concrete medium, it is necessary to consider the nonlinearity brought about by the discontinuous interaction between the ultrasonic wave and the medium, so the stress-strain relationship does not simply satisfy Hooke's law.

[0072] The wave equation of sound wave propagation in concrete ...

Embodiment 2

[0123] Embodiment 2 The present invention is based on the non-destructive testing device for the axial stress of concrete members based on the nonlinear ultrasonic harmonic method, which is used for testing the axial stress of concrete specimens

[0124] In order to verify the accuracy of the method of the present invention for detecting the internal stress of the concrete member, the following test for detecting the axial stress of the concrete specimen was done.

[0125] Standard cubic concrete specimens with strength grades of C25, C30, C35 and C40 and dimensions of 100×100×100mm were prepared in the laboratory, and immediately wet-cured in water for 28 days to keep it in a fully saturated water state, and finally soaked All the test pieces are taken out, weighed and recorded and ready to carry out the load test respectively, such as Figure 14shown. In this test, the center frequencies of the ultrasonic transmitting probe and the receiving probe are selected to be 50 kHz ...

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Abstract

The invention provides a device and a method for nondestructively testing an axial stress of a concrete member based on a nonlinear ultrasonic harmonic wave method. The method comprises the steps of through calibrating an initial nonlinear coefficient beta 0 and coefficients m and n of the concrete member, detecting an acoustic parameter nonlinear coefficient beta of an ultrasonic wave in the concrete member, and solving an inner axial stress sigma of a concrete structure. The concrete stress detection method provided by the invention has special sensitivity on disclosing concrete early-stagecrack and stress evolutionary characteristics, and solves the problem that a traditional ultrasonic wave method is insensitive to an early-stage stress. A detected result is verified, the accuracy ishigher, an error requirement in actual engineering can be met, and the structure member cannot be damaged during a detection process.

Description

technical field [0001] The invention belongs to the field of non-destructive detection of concrete component stress, in particular to a device and method for non-destructive detection of axial stress of concrete component based on nonlinear ultrasonic harmonic method. Background technique [0002] Concrete components are widely used in infrastructure construction due to their excellent performance, especially as important vertical compression components supporting large buildings, and the assessment of their safety status has also received increasing attention. The evaluation of the working stress of the concrete structure plays a very important role in the health diagnosis of the structure. It is not only an important index reflecting the stress state of the concrete structure, but also an important reference for determining the safe bearing capacity and service conditions of the structure. The speed of damage development and the residual bearing capacity of concrete struct...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/28
CPCG01N29/04G01N29/28G01N2291/0232G01N2291/0421G01N2291/102
Inventor 李祚华滕军何京波佘玲玲
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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