Simulation of concrete structures under highly dynamic loadings

摘要

More and more, building owners ask engieners to design their structures also for hazard loadings. These loadings are caused by explosion or impact, for example, and produce high pressures in the kilobar region within mircoseconds. In that topic, design tasks are a great challenge for engineers in practice as well as for researchers. Structural dynamics methods are well known but insufficient for such highly dynamic loadings. Thus, Hydrocodes are being applied. Reliability investigations show the capability of the numerical tool used. Appropriate constitutive laws enable the non-linear rate-dependent behaviour and the local damage behaviour. A recently developed material model for concrete based on macromechanics has been implemented in the Hydrocode via a couple of user defined subroutines. The features of the model are presented in this article in detail. Damage and fracture caused by a contact detonation on a concrete plate are numerically predicted. Nevertheless, experimental investigations are still needed. The numerical results are evaluated and compared qualitatively as well as quantitatively with full-scale tests. Finally, a penetration of a projectile into a concrete wall is simulated. It shows the capability of the new material model also for impact and penetration phenomena.