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Method for identifying key structural fatigue component

An identification method and component technology, applied in the direction of machine/structural component testing, measuring devices, instruments, etc., can solve problems such as judging whether it is critical or not

Inactive Publication Date: 2013-09-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the problem of finding key fatigue components arises. In actual situations, bridge components are subjected to variable amplitude loads, and it is difficult to use the stress amplitude under constant amplitude loads to judge whether a component is critical or not.

Method used

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  • Method for identifying key structural fatigue component
  • Method for identifying key structural fatigue component
  • Method for identifying key structural fatigue component

Examples

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] The identification method of structural key fatigue components of the present invention is to identify key fatigue components on the basis of the monitoring data obtained by the health monitoring system, as shown in the attached figure 1 shown, including the following steps:

[0038] 1) Traverse all components, and select representative standard samples ε from the strain database collected by health monitoring j (t), where j is the serial number of the component, t is the time, the hot spot stress analysis of the welding details is carried out on the component, and according to the hot spot stress analysis results of the component, the standard sample ε j (t) Converted to hot spot stress time history

[0039] 2) Time history of hot spot stress Perform preprocessing and rainflow counting operations in sequence to obtain the extracted stress cycle sequence C...

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Abstract

The invention discloses a method for identifying a key structural fatigue component, wherein a united framework which can contain different fatigue accumulation theories is provided, i.e. the effective stress amplitude is provided and serves as an identification standard for judging the key structural fatigue component. The method comprises steps: 1, traversing all the components, selecting representative standard samples from a strain database acquired from health monitoring, and converting the standard samples to a hot spot stress time interval according to the hot pot stress analysis results of the components; 2, carrying out operations such as preprocessing and rainwater metering on the hot spot stress time interval so as to obtain the extracted stress amplitude sequence; and 3, computing the effective stress amplitudes of all the components, and setting the component with the relatively large value as the key fatigue component. By utilizing the method, the problem of relating variable amplitude fatigue to constant amplitude fatigue is solved, the component with quick fatigue accumulation speed can be conveniently found out on the basis of the strain data which is obtained by a structural health testing system, and accordingly, the key fatigue component is identified.

Description

technical field [0001] The invention belongs to the field of bridge health monitoring systems, and relates to a method for identifying key fatigue components on the basis of strain data obtained by a long-span bridge health testing system. Background technique [0002] In recent years, with the development of health monitoring technology, most important long-span bridges have been installed with health monitoring systems. In bridge condition assessment based on monitoring data, fatigue assessment is an important component. In the face of a large number of components, a reasonable fatigue assessment strategy is to find some components with a faster fatigue accumulation rate as key fatigue components, and focus health monitoring on these components. As a result, the problem of finding key fatigue components arises. In actual situations, bridge components are subjected to variable-amplitude loads, and it is difficult to use the stress amplitude under constant-amplitude loads t...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 李兆霞吴佰建王莹
Owner SOUTHEAST UNIV
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