Behavior patterns of reinforced concrete structures of modular shelters in explosion conditions

The results of mathematical modeling of the impact of the explosion and the resulting stress-strain state in reinforced concrete structures of a modular shelter are presented. The compliance of the shelters with the safety conditions required by the current standards of Ukraine is also established. For this purpose, the behavior of the enclosing structures of ground modular shelters under the effects of explosions and the action of penetrating ionizing radiation was investigated, which guarantees the safety of people inside the shelters and their protection from the effects of air strikes. The scientific study obtained results that allow investigating the mechanisms of destruction or loss of integrity of shelter structures and establishing the relationship between these aspects and ensuring the performance of its protective functions under the effects of an explosion during enemy shelling. The results of the study were obtained through the development of a new approach to calculations based on the use of the warhead of the corresponding projectile in TNT equivalent, the explosion distance and the position of the point where the explosion occurs. The corresponding calculations were used in the LS-DYNA software package, where the behavior of reinforced concrete shelter structures under load conditions was mathematically described, and mathematical relations of strength and plasticity theories were also used. And the pressure determined by these parameters can be used to study its impact on structures. The results of mathematical modeling of the behavior of protective shelters under explosion conditions were obtained, which allow us to investigate the mechanisms of destruction or loss of integrity of shelter structures and establish the relationship of these aspects with ensuring the performance of its protective functions under the influence of an explosion. The implementation of the research results is the presentation of technical proposals for modular shelters to protect the population from damage caused by combat operations.