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Equivalent modal strain energy damage identification method

A modal strain energy and damage identification technology, which is applied in the testing of machines/structural components, instruments, measuring devices, etc., can solve the problems of low accuracy of damage identification and difficult quantitative identification

Inactive Publication Date: 2013-02-13
CHONGQING UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] One is that it is difficult to quantitatively identify multiple structural damages; the other is that the accuracy of damage identification is not high

Method used

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  • Equivalent modal strain energy damage identification method
  • Equivalent modal strain energy damage identification method
  • Equivalent modal strain energy damage identification method

Examples

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example 1

[0070] Example 1: When damage occurs in units 5, 9 and 22, the strain energy dissipation rate method and the strain energy equivalent index method proposed by the present invention are used respectively to carry out damage identification research. The calculation results of the two methods are as follows image 3 shown. From image 3 It can be found that both methods can effectively identify the damage unit, but the strain energy dissipation rate method has low recognition accuracy for the damage degree. The damage values ​​calculated by this method for units 5, 9 and 22 are 0.357 , 0.353 and 0.276, which are quite different from the real values, but the strain energy equivalent index method proposed by the present invention can determine the degree of damage more accurately, and the values ​​calculated for units 5, 9 and 22 are 0.198 and 0.195 respectively and 0.149, the index value is very close to the real damage degree, therefore, the strain energy equivalent index method...

example 2

[0071] Example 2: When damage occurs to elements 11, 21 and 45, the strain energy dissipation rate method and the strain energy equivalent index method are also used to carry out damage identification research. The calculation results of the two methods are as follows Figure 4 shown. From Figure 4 It can be found that both methods can effectively identify the location of the damage unit, but the strain energy dissipation rate method is not accurate enough to identify the damage degree. The damage values ​​calculated by the strain energy dissipation rate method for elements 11, 21, and 45 are 0.355, 0.506, and 0.13, respectively, which are quite different from the real values. However, the strain energy equivalent index method proposed by the present invention can more accurately determine the degree of damage, and the values ​​calculated for units 11, 21 and 45 are respectively 0.197, 0.297 and 0.067, which is very close to the real degree of damage. Therefore, the strain ...

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Abstract

The invention provides an equivalent modal strain energy damage identification method. The method comprises the following steps of: respectively solving corresponding modal strain energy by using a modal shape generated before and after being damaged; and then judging the damage position and the damage degree of the unit by using an strain energy equivalent index of each damage unit; if an index value is approximate to zero or has a negative value, expressing that no damage exists; and if the index value is a positive value, expressing that the unit has the damage, wherein the damage degree of the unit is the size of the equivalent index value. Compared with the strain energy variation rate method, a strain energy equivalent index method has the advantage of quantitative identification; and compared with the strain energy dissipation rating method, the strain energy equivalent index method has the advantage of higher identification precision.

Description

technical field [0001] The present invention relates to a damage detection method for building structures, in particular to a damage identification method for equivalent modal strain energy. [0002] Background technique [0003] Severe damage to the structure will cause the collapse or failure of the building, resulting in a huge loss of economy or human life. Therefore, the identification of structural damage has always been a research hotspot in the world. The damage identification method based on modal strain energy is a more effective damage identification method, Shi Z L et al. (Shi Z Y, Law S S and Zhang L M. Structural damage localization from modal strain energy change[J].Journal of Sound and Vibration , 1998, 218(5): 825-844.) Using the change of element modal strain energy to carry out structural damage identification, and considering the incompleteness of modal data, a modal strain energy change rate was proposed method for damage identification, but this meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00
Inventor 郭惠勇
Owner CHONGQING UNIV
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