Abstract
The main purpose of this study is to investigate the effects of the stress path, size and shape of the specimen, on the optimum values of the plastic input parameters of Concrete Damaged Plasticity-CDP- model of the ABAQUS software. This study concentrates on eccentricity, dilatation angle and viscosity input parameters. To finding optimum values of the mentioned parameters, an objective function which estimates the error of the model predictions was defined and tried to minimize. For evaluating the effect of the stress path on this optimization procedure, four different standard tests were simulated by the ABAQUS software: uniaxial compression, dual compression, dual-border cut specimen and three-point bending tests. For studying the effect of the size of the specimen, the three-point bending test, with three different sizes of the beam were modeled in the ABAQUS software. Furthermore, for investigating the effect of the specimen shape on the input parameters, a notched disk in a tensile stress field was modeled. Obtained results demonstrated that the path of the stress can influence significantly on the optimum values of the input parameters, while it was revealed that the CDP model can automatically take into account the size and shape effects in the simulation.
Highlights
Accurate modeling of the behavior of concrete structures under the action of different loading conditions is a crucial task
The Concrete Damaged Plasticity or in the abbreviated form as CDP model of the ABAQUS standard software is a sophisticated material model of concrete and the authors of this paper are intended to investigate whether this model satisfies the two above mentioned fundamental conditions
The constitutive model used in this study for concrete is the Concrete Damaged Plasticity (CDP) Model formulated in the ABAQUS software
Summary
Accurate modeling of the behavior of concrete structures under the action of different loading conditions is a crucial task. Sadeghi et al (2017) conducted a research on the mechanism of transfer of load from railway to concrete slab support and improved the current practice of design of such slabs using CDP with a nonlinear model Authors of this present paper decided to find a set of optimum plastic parameters of the CDP model considering two important effective factors which have not been considered in the above mentioned studies: stress path and size effects. For the other two remained tests; dual-border cut specimen and three point bending, the objective function is defined as the root of the ratio of the sum of the squares of the differences between the value of loads obtained from the experiment and FEA results in the same displacement to the sum of the squares of the experimental data. The optimum input parameters obtained for threepoint bending test were utilized
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