An enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial loading conditions

Abstract

Some of the current concrete damage plasticity models in the literature employ a single damage variable for both the tension and compression regimes, while a few more advanced models employ two damage variables. Models with a single variable have an inherent difficulty in accounting for the damage accrued due to tensile and compressive actions in appropriately different manners, and their mutual dependencies. In the current models that adopt two damage variables, the independence of these damage variables during cyclic loading results in the failure to capture the effects of tensile damage on the compressive behavior of concrete and vice-versa. This study presents a cyclic model established by extending an existing monotonic constitutive model. The model describes the cyclic behavior of concrete under multiaxial loading conditions and considers the influence of tensile/compressive damage on the compressive/tensile response. The proposed model, dubbed the enhanced concrete damage plasticity model (ECDPM), is an extension of an existing model that combines the theories of classical plasticity and continuum damage mechanics. Unlike most prior studies on models in the same category, the performance of the proposed ECDPM is evaluated using experimental data on concrete specimens at the material level obtained under cyclic multiaxial loading conditions including uniaxial tension and confined compression. The performance of the model is observed to be satisfactory. Furthermore, the superiority of ECDPM over three previously proposed constitutive models is demonstrated through comparisons with the results of a uniaxial tension-compression test and a virtual test.

Exploring strength and ductility responses of beam-column joints using UHPC and UHPFRC employing concrete damaged plasticity

“…However, addressing structural fatigue in high cycles presents challenges due to the difficulty in capturing damage through independent variables and the absence of necessary parameters to represent the heterogeneous behavior of materials under high cycles and multiaxial loadings [26][27]. For high-cycle analysis, using more robust models, such as the CDPM2 model by Grassl et al [28] and the Enhanced Damage Plasticity (ECDP) proposed by Kakavand and Taciroglu [29], is essential. In this manner, the present study applies the CDP model to represent the behavior of portal joints under the studied static loading.…”