Particle filter life prediction method for multi-factor concrete freezing and thawing

Abstract

The invention relates to a particle filter life prediction method for multi-factor concrete freezing and thawing. The method comprises the following steps: constructing a state equation of a freezing and thawing degradation process according to an attenuation rule of a relative dynamic elastic modulus along with a freezing and thawing cycle; constructing an observation equation of freezing and thawing degradation according to the relationship between the acoustic time and the relative dynamic elastic modulus; and finally, based on the state and observation equation, establishing a state space model of the concrete freezing and thawing damage degradation process, and realizing multi-factor concrete freezing and thawing life prediction by using particle filtering. Particle filtering can eliminate the influence of various uncertain factors, the requirement for model complexity is low, a large amount of training data is not needed, and compared with a traditional method, the invention has higher service life prediction precision and has important application value and economic benefits for improving concrete structure design, prolonging the service life and enhancing maintenance guarantee.

Description

technical field [0001] The invention belongs to the field of concrete durability analysis and evaluation, and relates to a particle filter life prediction method for multi-factor concrete freezing and thawing. Background technique [0002] The research on the durability of concrete shows that the damage factors that cause the deterioration of concrete structures, in descending order of importance, are: corrosion of steel bars, freeze-thaw damage and seawater erosion. At present, in my country's "Three Norths" and other severe cold regions, a large number of structures such as highways, airport runways, cross-sea and coastal projects are facing severe durability tests due to long-term erosion of seasonal freeze-thaw damage such as wind, frost, rain and snow. [0003] As an important part of the durability assessment of concrete structures, residual life prediction can not only reveal potential dangers, formulate maintenance strategies in time, and avoid major accidents, but a...

AI Technical Summary

Problems solved by technology

The life prediction model of freeze-thaw damage is based on the freeze-thaw damage model. However, during the evolution of concrete freeze-thaw damage, it is affected by material properties, loads, chloride ion erosion, carbonization, abrasion, alkali aggregate reaction, test error Influenced by many factors, the evolution process has a high degree of uncertainty. If the influence of many factors is considered, the deterministic life prediction model constructed will become extremely complicated and difficult to apply in actual engineering.

At the same time, the traditional reliable freeze-thaw life prediction method will consume expensive experimental resources, and it is only applicable to some specific conditions, with poor applicability

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