Modeling of the reinforced concrete structures destruction with explicit and implicit consideration of reinforcing elements

The paper presents the results of a numerical study of the destruction of a concrete structure - a protective shell of a nuclear power plant (NPP) interacting with an aircraft engine. The concrete behavior model takes into account the differences in the limits of compressive and tensile strength, the dependence of the ultimate strength on the deformation rate, the plastic properties of concrete, destruction, fragmentation of the shell. The engine is presented as a titanium cylinder with a diameter of 0.9 m and a mass of 4300 kg. The titanium behavior is described by an elastoplastic model. Numerical modeling is carried out by the finite element method in a full three-dimensional formulation within the phenomenological approach of continuum mechanics, using the author's computer complex EFES. Various approaches to accounting reinforcement are considered—an explicit selection of reinforcing elements, which taking into account their contact interaction with concrete, and using a mixed model, when the properties of the area containing reinforcing elements are described based on the volume concentration of materials.