Dynamic probabilistic modeling method of measured stress amplitude in welded joints of orthotropic steel bridge decks

A steel bridge deck, orthotropic technology, applied in special data processing applications, instruments, geometric CAD, etc., can solve the problem of inaccurate fatigue life assessment of structures

Active Publication Date: 2019-10-29
ZHEJIANG UNIV
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Problems solved by technology

When the time history of the collected strain data is long enough, the obtained stress spectrum can accurately reflect the load information of the structure, but if the time history of the collected strain data is short, missing some low frequencies will have a significant impact on the fatigue life of the structure Hot spot stress amplitudes, which can lead to inaccurate fatigue life assessments of structures

Method used

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  • Dynamic probabilistic modeling method of measured stress amplitude in welded joints of orthotropic steel bridge decks
  • Dynamic probabilistic modeling method of measured stress amplitude in welded joints of orthotropic steel bridge decks
  • Dynamic probabilistic modeling method of measured stress amplitude in welded joints of orthotropic steel bridge decks

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Embodiment Construction

[0071] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0072] A dynamic probability modeling method for measured stress amplitude of welded joints of orthotropic steel bridge decks according to the present invention, the specific steps are as follows:

[0073] A. Select sections and measuring points and collect data;

[0074] A1. Fully understand the basic information of the tested bridge, and analyze the overall mechanical performance of the bridge;

[0075] A2. According to the bridge type and force characteristics, select the section and measuring points, and collect the measured strain data at the welding nodes;

[0076] B. Prepare stress spectrum;

[0077] B1. Preprocess the measured strain data, and multiply the strain time history data by the elastic modulus of the steel to obtain the stress;

[0078] B2. Apply the rainflow counting method to obtain the stress spectrum, average stress and ...

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Abstract

Disclosed is a dynamic probabilistic modeling method for measured stress amplitude of orthotropic steel bridge deck welded joints. The implementation process comprises the following steps of 1, collecting sensor data and obtaining strain, 2, obtaining stress amplitude, average stress and cycle times on the basis of a rain flow counting method, 3, establishing standard daily stress spectrum after statistical analysis, 4, estimating and obtaining an optimal probability model on the basis of EM algorithm parameters, and 5, updating the model on the basis of Bayesian Dynamics.

Description

technical field [0001] The invention relates to the fields of structural health monitoring, stress analysis of orthotropic steel bridge decks, probability modeling and the like, and specifically relates to a dynamic probability modeling method for measured stress ranges of welding nodes of orthotropic steel bridge decks. Background technique [0002] Steel bridges use high-strength steel as the main construction material, which has the advantages of light weight, good seismic performance, strong ductility, and low environmental hazards. It is also suitable for large-scale production in factories and is easy to transport. The innovation of computer technology has also advanced structural analysis methods. The development and the improvement of welding technology have made it widely used at home and abroad, and its development is getting faster and faster. However, due to the complex structure of the welded structure, different degrees of structural damage will occur during se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 叶肖伟苏有华袁琳
Owner ZHEJIANG UNIV
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