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A non-destructive testing method for multiple defects inside the built building structure

A non-destructive testing and building technology, applied to measuring devices, processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as the difficulty of detecting structural defects in built buildings, and achieve the goal of non-destructive testing Difficulty, effects that increase lifespan and durability

Active Publication Date: 2020-05-05
HOHAI UNIV
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Problems solved by technology

[0003] Purpose of the invention: In order to solve the problem of difficulty in detecting internal defects of built building structures in the prior art, the present invention provides a non-destructive testing method for multiple defects inside built building structures

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  • A non-destructive testing method for multiple defects inside the built building structure
  • A non-destructive testing method for multiple defects inside the built building structure
  • A non-destructive testing method for multiple defects inside the built building structure

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 As shown, the non-destructive testing method for multiple defects inside the built building structure includes the following steps:

[0028] (1) Acceleration sensors are arranged on the exposed surface of the building to be detected. The determination and installation of the number of acceleration sensors are as follows:

[0029] (1.1) see figure 2 , the estimated number of defects that may exist in the structure is 2 (defect 1 and defect 2), and the number of parameters to be inverted for each defect (fitted with elliptical defects) is 5 (ellipse center coordinates, ellipse semi-major axis , ellipse semi-minor axis, ellipse inclination angle), then the number of layouts of the acceleration sensors should be equal to or greater than 10, and the present embodiment chooses to arrange ten acceleration sensors (S1, S2, S3...

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Abstract

The invention discloses a nondestructive testing method for multiple defects in a built building structure. An acceleration sensor is arranged on the exposed surface of a building to be detected; thesame part is knocked for many times by using a pulse hammer, shock waves are obtained by using the acceleration sensor, spectrum analysis is carried out on shock wave response signals, and previous 3-5 orders of frequencies and measurement values of modal vectors corresponding to the orders of frequencies are obtained; a finite element model of the building structure is established, defect information is randomly put based on an intelligent optimization algorithm, and previous 3-5 orders of frequencies and modal vectors corresponding to the orders of frequencies are theoretically calculated; an objective function is constructed; and the defect information is iteratively updated to minimize the objective function until the convergence precision is achieved, and the number, positions and sizes of the defects are inverted. According to the method, the number, positions and sizes of internal defects of the built building structure can be quickly found through field testing, the difficultyof nondestructive testing of the built building structure under complex conditions is solved, the service life of the building structure is prolonged, and the durability of the building structure is improved.

Description

technical field [0001] The invention relates to the field of health detection of civil and water conservancy engineering structures, in particular to a non-destructive detection method for multiple defects inside the built building structure. Background technique [0002] Along with the large-scale development of the coastal areas of Jiangsu, the South-to-North Water Diversion Project, the Huaihe River and the Huaihe River and the construction of the Huaihe River, many water conservancy projects (sluices, pumping stations and ship locks, etc.) and water transportation and shipbuilding projects (wharfs, docks) have been built. Most of these structures are underground concealed projects. Usually, after the construction is completed, they will be covered by subsequent construction, or only a small part will be exposed. It has become a crucial issue to effectively detect these structures, quickly detect possible defects inside the building structure and repair them, and ensure t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/44
Inventor 江守燕杜成斌孙立国赵林鑫
Owner HOHAI UNIV