Dynamische Eigenschaften von Beton im Experiment und in der Simulation

Dynamic properties of concrete in experiment and simulation

Concrete subjected to dynamic loads behaves differently compared to static loading. As an explanation at low strain rates up to ϵ = /s, internal transport effects are assumed to be originated in the material. At higher strain rates up to ϵ = 300/s, inertial effects during the formation of cracks are postulated. The experimental identification of these phenomena and the definite separation of their substantial and structural sources are subject to current research. The split Hopkinson pressure bar experiment enables the investigation of the behaviour of concrete subjected to dynamic loading.

In the following, experiments in the range of quasi‐static loading up to loads that induce strain rates until ϵ = 211/s on a standard concrete C35/45 grade are presented, evaluated and simulated. In the simulation, a material model is applied that bases on the micro‐plane model extended by a non‐local formulation of plasticity. Furthermore, structural inertia effects are taken into account. It is shown that the experimentally found increase in strength of the concrete at higher strain rates can be modelled by the simulation.