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Structural damage location and damage degree identification method based on small amount of static measurement data

A technology for measuring data and structural damage, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of large amount of data and low recognition efficiency, and achieve the effect of easy implementation, small measurement error and improved recognition accuracy.

Active Publication Date: 2014-06-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the application of time domain response data, it is required to measure vibration data within a certain period of time, so the amount of measured data is relatively large
Similarly, because the damage location is not predicted first, it will cause the problem of low recognition efficiency

Method used

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  • Structural damage location and damage degree identification method based on small amount of static measurement data
  • Structural damage location and damage degree identification method based on small amount of static measurement data
  • Structural damage location and damage degree identification method based on small amount of static measurement data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1: Damage identification for a simply supported beam

[0076] Such as figure 1 The simply supported beam with a rectangular interface is shown, the geometric parameters are shown in the figure, and the structural parameters are: Young's modulus E=3.0×10 10 N / m 2 , material density ρ=2800kg / m 3 . Decompose the simply supported beam into figure 1 The 20 Euler-Bernoulli beam elements shown. Assuming damage occurs to the 5th and 14th elements, their stiffnesses are reduced by 15% and 20%, respectively.

[0077] 1) Step 1: Select an external load solution

[0078] figure 2 are the two preset options to be selected, and the selection indicators can be calculated separately to get: D 1 =3.9750,D 2 =2.9814. D by comparison 2 smaller. illustrate figure 2 The external load application scheme in (b) is better.

[0079] 2) Step 2: Predict Suspicious Units

[0080] According to the selected external loading scheme, the deflection values ​​of nodes 4, 6, 8, 1...

Embodiment 2

[0083] Example 2: Damage identification for a three-span continuous beam

[0084] Such as Figure 5 The geometric parameters of the three-span continuous beam of rectangular section shown are shown in the figure. The structural parameters are: Young's modulus E=3.0×10 10 N / m 2 , material density ρ=2800kg / m 2 . put the beam as Figure 5 The discretization shown is 24 elements. Assume that units 4 and 21 are damaged, and the degree of damage is 20%. The loading scheme is already pre-selected, see Figure 5 .

[0085] 1) Forecast can unit

[0086] According to the position where the force acts, select the measuring point. Measure the deflection values ​​at nodes 3, 5, 7, 11, 13, 15, 19, 21 and 23. Using these 9 measurement data, the respective RSE values ​​of 24 cells were calculated. get results like Figure 6 shown. It can be seen that the RSE values ​​of cells 4, 5, 20 and 22 stand out clearly. Then select these 4 units as suspicious units for further identifica...

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Abstract

The invention discloses a structural damage location and damage extent identification method based on a small amount of static measurement data. The method comprises the following steps: (1) choosing a loading scheme according to an index Di; (2) calculating residual strain energy (RSE) values of all units; (3) comparing all the RSE values and selecting the unit with the highest RSE value as a doubtful unit; (4) calculating a sensitivity matrix (S) and a response difference (delta Um) of a model to be corrected and a real model; (5) solving the equation (S) (delta alpha)=(delta Um); (6) updating an damage parameter alpha it plus 1, which is equal to alpha it plus delta alpha it, of the doubtful unit; (7) returning to the step (4) for loop iteration if the precision requirement is not met, otherwise, outputting the damage parameter as an identification result. The method defines the concept of RSE and can predict the damage position and reduce the quantity of parameters required to be recognized; the sensitivity static response method is adopted to perform model correction, the required data volume is low, and the recognition efficiency and the recognition precision are high.

Description

technical field [0001] The invention relates to the technical field of structural health detection and damage identification, and more particularly, relates to a method for detecting damage to a structure using a small amount of static measurement data. Background technique [0002] With the development of science and technology in our country, various large and complex structures can be seen everywhere. Buildings, bridges, high-speed rails on the ground, drilling platforms on the water, and even aerospace structures in space, etc., all belong to the category of structures that need to be considered. However, during the service of these structures, local damages inevitably occur in some components as time goes by. If these damages are ignored and allowed to develop and expand, it will eventually lead to the destruction of the structure. The destruction of the structure will not only bring economic losses to the country, but even seriously threaten the lives of the people. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 吕中荣朱嘉健
Owner SUN YAT SEN UNIV
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