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Damage degree identification method for high-rise frame structures based on natural frequency change rate

A technology of frequency change rate and damage degree, which is applied in the field of identification of structural damage degree to achieve the effect of quantifying the degree of damage

Active Publication Date: 2019-02-22
DALIAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no relevant report on how the natural frequency change rate can identify the damage degree of the structure

Method used

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  • Damage degree identification method for high-rise frame structures based on natural frequency change rate
  • Damage degree identification method for high-rise frame structures based on natural frequency change rate
  • Damage degree identification method for high-rise frame structures based on natural frequency change rate

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Embodiment Construction

[0042] The following describes how to use the first-order natural frequency change rate to identify the damage degree of high-rise frame structures in conjunction with the accompanying drawings.

[0043] When the structure is damaged, the stiffness of the structure will decrease accordingly. According to the definition of frequency:

[0044]

[0045] In the formula, f is the frequency, K is the structural stiffness, and m is the mass of the structure.

[0046] Differentiate both sides simultaneously to get:

[0047]

[0048] Simplified:

[0049]

[0050] Divide K on both sides to get:

[0051]

[0052] Simplify by dividing dt on both sides:

[0053]

[0054] The f value here corresponds to the K value, and K takes the K value before damage, so f here is the f value before damage, so is a definite constant, so:

[0055] k f =k'·P K

[0056] That is, there is a linear relationship between the frequency change rate and the damage degree index.

[0057] Im...

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Abstract

The invention discloses a damage degree identification method of high-rise framework structures based on natural frequency change rate. The method comprises following steps: establishing a relation between frequency change rate kf and damage degree index PK through a numerical simulation method; performing inverse computation to obtain the damage degree index PK by means of actually measured acceleration response values after damage. According to the present damage identification methods, it is required to perform comparison and analysis on current response value signals of the structure with the response value signals before damage to identify damage degree; while by means of the method provided by the invention, only current response value signals are required for analysis to obtain the damage degree of the structure. The provided method quantifies the relation between damage degree index and frequency change rate so that damage degree index can be quantitatively obtained and the damage degree is quantified. According to the provided method, the structure damage degree and the frequency change rate are formulated so that structure damage degree can be accurately calculated by means of the method.

Description

technical field [0001] The invention relates to a method for identifying the degree of damage of a structure, in particular to a method for identifying the degree of damage of a high-rise frame structure. Background technique [0002] In today's building construction, high-rise frame structures are more and more widely used. However, with the effects of material aging, environmental corrosion, load effects, man-made and natural mutation effects, these effects will inevitably lead to structural damage accumulation and resistance. Therefore, it is imminent to detect, identify and evaluate the damage of high-rise frame structures by scientific means from the perspective of structural durability and safety. [0003] The current identification methods based on the damage degree of high-rise frame structures are all through comparative analysis of the response values ​​before and after damage, so as to judge whether the structure is damaged. [0004] However, in real life, the da...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 裴强郭少霞夏超南薛志成
Owner DALIAN UNIV
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