关键词: DIC;损伤模型;损伤演化因子;玄武岩纤维

Abstract: Through digital image correlation method, the surface strain field of basalt fiber reinforced concrete under pressure was calculated.The change of the horizontal strain cloud diagram about the specimen surface was analyzed,the evolution rule of compression damage about BFRC was obtained.By means of statistical analysis of horizontal strain field,the damageevolution factor was defined by using the statistical index of strain field standard deviation and the curve of BFRC damage evolution with different fiber dosage was obtained.At the same time, the constitutive model of BFRC uniaxial compression damage was deduced based on the strain equivalence principle and the damage evolution factor.The test resultis in good agreement with model curve, which couldeffectively describe the damage evolution process of BFRC under uniaxial compression before peak strain.Through the comparison curves,it shows that the basalt fiber can effectively improve the peak stress and peak strain of concrete.The ductility could also be enhanced.And the fiber still have the effect of delaying damage.

Key words: DIC;damage model;damage evolution factor;basalt fiber