复合材料科学与工程Issue(12)：87-95,9.DOI:10.19936/j.cnki.2096-8000.20241228.013
纤维增强复合材料加强混凝土的约束效应研究
Research on the confinement effect of fiber-reinforced polymer materials reinforced concrete
摘要
Abstract
To accurately predict the confinement effect of fiber-reinforced composite materials applied to con-crete,strength and strain effect models for fiber-reinforced composite-constrained concrete were proposed based on Random Forest and CatBoost algorithms.Data of 502 concrete specimens with fiber-reinforced composite wrapping along the lateral side were collected,including parameters such as concrete cross-sectional dimensions,fiber-rein-forced composite wrapping thickness,fracture strain and elastic modulus,unconstrained concrete strength and strain,constrained strength effect,and constrained strain effect.Existing empirical models for confinement strength and strain effects were compared and evaluated.Three evaluation metrics,namely determination coefficient(R2),root mean square error,and mean absolute error,were selected for the comparative evaluation of the developed Random Forest and CatBoost models.The results showed that for the confinement strength effect,the R2 values of the Ran-dom Forest model and CatBoost model were generally above 0.84,higher than the existing empirical models(0.78 to 0.83).Regarding the confinement strain effect,the R2 values of the Random Forest model and CatBoost model were generally above 0.87,also higher than the existing empirical models(0.65 to 0.75).This indicated that the performance of the developed Random Forest and CatBoost models was superior to the existing empirical models,and both models could provide relatively accurate predictions of the confinement effect of fiber-reinforced composite materials applied to concrete.Particularly,the CatBoost model demonstrated higher accuracy.关键词
复合材料/纤维增强/混凝土/约束强度效应/约束应变效应Key words
composite materials/fiber-reinforced/concrete/confinement strength effect/confinement strain effect分类
通用工业技术引用本文复制引用
千银敏,沈寒峰,王涛,张开金..纤维增强复合材料加强混凝土的约束效应研究[J].复合材料科学与工程,2024,(12):87-95,9.基金项目
国家自然科学基金(51978545) （51978545）
