Modelling of compressive behaviour of concrete-like materials at high strain rate

Computational aspects of biaxial stress in plain and reinforced concrete : proefschrift

The dynamic behavior of concrete is studied experimentally by testing annular and solid concrete specimens using split Hopkinson pressure bar (SHPB). The dynamic increase factor (DIF) of annular samples is relatively lower than the DIF of solid samples. The dynamic behavior of concrete seems to be independent of the quasi-static strength of concrete. The mode of failure of concrete was a typical ductile failure at high strain-rates and brittle at low strain-rates. No significant influence of strain-rate on the initial elastic modulus of concrete was observed. An empirical equation is proposed for the estimation of DIF of concrete based on the experiments. A model is developed for the prediction of stress–strain curve of concrete under dynamic loading which shows good agreement with the experiments.

Rate dependent behavior and modeling of concrete based on SHPB experiments

Dynamic material properties, in particular the dynamic strength, of concrete material are usually obtained by conducting laboratory tests such as drop-weight test and Split Hopkinson Pressure Bar (SHPB) test. It is commonly agreed that a few parameters associated with stress wave propagation will affect the test results, including the lateral and axial inertial effect, end friction confinement and stress wave reflection and refraction. Many different measures have been proposed to eliminate or limit the influences of these effects in dynamic tests of material properties. However, owing to the nature of dynamic loadings, especially those with high loading rates, it is very unlikely to completely eliminate these influences in physical testing. Moreover, it is also very difficult to quantify these influences from the laboratory testing data. In the present study, a refined mesoscale concrete material model is developed to simulate impact tests and to study the influences of lateral inertial confinement on co...

Numerical Analysis of Lateral Inertial Confinement Effects on Impact Test of Concrete Compressive Material Properties

Numerical investigation of concrete subjected to compressive impact loading. Part 1: A fundamental explanation for the apparent strength gain at high loading rates

This paper deals with a viscoplastic model which is the natural way to take into account the rate effect. Consideration of viscosity averts the habitual mesh sensitivity when strain softening is introduced by preserving the well-posedness of the initial boundary value problem. Modeling can constitute an alternative to experimentation not in order to predict the material response, but to try to understand and to evaluate the rate effect. Numerical simulation of the split test Hopkinson pressure bar gives an idea of dynamic concrete behaviour: forces of inertia, inertial confinement, structural effect and rate effect. Finally, the model is used to simulate a reinforced concrete beam submitted to impact.

Modeling of structures subjected to impact: concrete behaviour under high strain rate

http://manuscript.elsevier.com/S0141029622001390/pdf/S0141029622001390.pdf

Multifiber finite element model based on enhanced concrete constitutive law to account for the effects of early age damage on the seismic response of RC structures

J.F. Georgin

Papers

Modeling of structures subjected to impact: concrete behaviour under high strain rate

Multifiber finite element model based on enhanced concrete constitutive law to account for the effects of early age damage on the seismic response of RC structures