Compression damage constitutive model of hybrid fiber reinforced concrete and its experimental verification

n order to study the constitutive model of hybrid fiber concrete (HFRC) and the law of damage evolution, the damage constitutive model of -PP and PVA-PP mixed fiber with steel is studied by means of statistical method and energy method. The damage variable correction coefficient is introduced to optimize the statistics based method. The energy method is used to deduce the constitutive model of material damage based on the SIR model and the formula and to discuss the physical meaning of the parameters. At the same time, the accuracy of the model is verified by a single axial compression test. The results show that the stress strain curve obtained by the statistical method is in good agreement with the test results when the strain is relatively small. When the strain is large, the result is deviant from the test result. The calculation result is more accurate after the damage deformation correction coefficient is introduced. The calculation of the energy method based on the SIR model is simple, the result is high and the strain is still high. The residual stress of the specimen can be reacted. The two methods can be used to calculate the compression damage constitutive model of hybrid fiber reinforced concrete, and it can be applied in engineering. (C) 2020 Elsevier Ltd. All rights reserved.