A concrete damage plasticity model for predicting the effects of compressive high-strength concrete under static and dynamic loads

Abstract

In this paper, a concrete damage plasticity model is presented for simulating the behaviour of high-strength concrete; C60, C80 and C110 under static and dynamic loading conditions. This model is based on the ground-breaking studies recorded in recently completed studies to improve and develop the original concrete damage plasticity (CDP) model in ABAQUS software. In this CDP model, the stress-strain curves in compressive behavior and tensile behavior during the softening phase (after stress reaches peak strength) consider the effect of mesh size in Finite Element model. Through recently published results, these curves show many advantages compared to the previous studies. At the same time, the tensile damage variable (dt) and the compressive damage variable (dc) are presented using an exponential function to replace the values reported in previous researches. Especially, in the case of dynamic problems, the Dynamic Increase Factor (DIF) according to the fib MODEL CODE 2010 (MC2010) is used in this study as a significant parameter to determine the effects of strain rate on compressive strength of high-strength concrete. To prove the reliability and effectiveness of the proposed model, numerical simulation of the static compressive tests is implemented to verify its suitability in case of static loading problems. Then, Split-Hopkinson pressure bar (SHPB) test is simulated to determine the level of accuracy of DIF in simulating the dynamic loading problems. The results show that the CDP model introduced in this study has an acceptable agreement with the experimental results for both cases; static and dynamic loading conditions, with high reliability.