USER INTERFACE DEVELOPMENT FOR IDENTIFYING CDP CONSTITUTIVE MODEL PARAMETERS

Abstract

This paper presents the development of a user interface for the automatic identification of concrete damage plasticity (CDP) constitutive model parameters, based on the results of experimental results. The application uses the results of uniaxial compressive and tensile tests. CDP constitutive model is often used in the simulation of the mechanical behaviour of concrete, and with appropriate modifications it can also be used to simulate the behaviour of the rock mass. The theoretical basis of the concrete damage plasticity constitutive model is given in the paper and the theoretical meaning of certain parameters is explained. In order to unambiguously identify the material parameters, it is necessary to obtain the experimental stress-strain dependence, as well as the stress-degradation dependence. In order to determine these dependencies, it is necessary to carry out load-unload tests, until the complete failure of the specimen. Verification of the material parameters obtained by the identification process using the developed user interface was carried out through numerical simulations of uniaxial compression and tension tests using PAK software.