A method for calculating crack width variation under temperature effects

CN116644492BActive Publication Date: 2026-05-26GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
Filing Date
2023-04-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies fail to effectively account for the impact of temperature changes on the width of bridge cracks, and existing methods or devices are either costly or unsuitable for bridge engineering, making it impossible to quickly calculate the changes in crack width under temperature variations.

Method used

A cross-level modeling method was adopted to study the effects of uniform temperature effect and gradient temperature effect on crack width. Combined with the correction of material properties with temperature change, a calculation formula for crack width change was established, including the relationship Δw1, Δw2 and Δw′.

Benefits of technology

It enables rapid assessment of bridge crack propagation, guides bridge condition monitoring and emergency management, has strong applicability, is easy to operate, and has high promotional value.

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Abstract

This invention provides a method for calculating crack width variation under temperature effects. The specific steps include: S1, using a cross-level modeling method for the actual bridge under test, obtaining the relationships between temperature change and crack width variation under uniform temperature effects and under gradient temperature effects; S2, integrating the relationships obtained in step S1 to establish a comprehensive relationship between uniform temperature, gradient temperature, and crack width variation; S3, modifying the relationships based on material properties changing with temperature to obtain a modified formula for calculating crack width variation. This calculation method studies the effects of uniform temperature and gradient temperature on bridge structures under actual conditions, comprehensively establishing formulas for the relationship between uniform temperature, gradient temperature, and crack width variation, while modifying the relationships based on material properties changing with temperature, thus obtaining a formula for calculating crack width variation under temperature effects.
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