A method and system for predicting mesoscopic damage characteristic parameters of concrete in a freeze-thaw environment

Abstract

The present application belongs to the field of concrete freeze-thaw damage prediction and constitutive modeling, and particularly relates to a kind of concrete mesoscopic damage characteristic parameter prediction method and system in freeze-thaw environment, aims at solving the problem that mesoscopic damage characteristic parameter is difficult to determine quickly under different components and freeze-thaw, loading conditions, and model prediction result may not comply with the physical law.The present application includes: constructing input feature vector, predicting elastic modulus, fracture damage value and damage characteristic strain by using extreme gradient boosting regression model; generating and screening candidate parameter group, substituting the selected parameter group into statistical damage constitutive equation, determining the mesoscopic damage characteristic parameter after physical constraint correction according to the constitutive curve shape and parameter deviation, and generating the constitutive curve of stress change with strain.The present application can improve the physical consistency between prediction parameter and damage evolution law and constitutive curve.

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