- STRUCTURAL MECHANICS
- Deformation Models of Reinforced Concrete under Special Impacts
- UDC 624.012.45

**Vitaliy I. KOLCHUNOV**, e-mail: asiorel@mail.ru

**Vladimir I. KOLCHUNOV**, e-mail: vlik52@mail.ru

Southwest State University, ul. 50 let Oktyabrya, 94, Kursk 305040, Russian Federation

**Natalia V. FEDOROVA**, e-mail: fenavit@mail.ru

Moscow State University of Civil Engineering (National Research University), Yaroslavskoe shosse, 26, Moscow 129337, Russian Federation

**Abstract**. The separate directions of development of deformation models of the theory of reinforced concrete under special impacts causing its structural change are formulated. It is shown that in cases of formation of single cracks in reinforced concrete structures to evaluate their stiffness and strength parameters, it is necessary to take into account more strictly the character of distribution of deformations of stretched concrete and reinforcement, distortion of the crack surface and deformation effect during their formation. Proposals are given to take into account the features of the regime of static-dynamic loading of structures with varying design schemes (constructive nonlinearity) with simultaneous manifestation of the nonlinear deformation and fracture formation stages in reinforced concrete. The necessity of taking into account the specificity of the stressed state of the zones of cross-media concentration of the stress-strain state in layered and composite structures is substantiated, and the structure of physical equations for a plane-stressed reinforced concrete element simulating such zones is argued. A general model of the kinetics of non-equilibrium processes of concrete deformation during sudden structural changes in time associated with a sudden change in the level of the stressed state is presented.

**Key words**: reinforced concrete, deformation models, structure, special impacts, rigidity, deformation effect, force and environmental loading. - REFERENCES

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