Modeling of Building Structures Resistance to Collapse Failure from Explosive Impact

The article is devoted to the issues of modeling and analysis of the protective structures’ designs under the influence of explosive loads. An analysis of shock waves is carried out, the nature of their propagation and impact on buildings, as well as methods for their modeling in the LIRA-SAPR software. Some proposals for preventing the collapse failure of the structure due to the impact of missile fragments are given. The article discusses different types of point explosions - air and ground. The diagram of the formation of waves during an air explosion and a characteristic wave pattern during a ground explosion is given. The propagation of waves during a ground explosion is analyzed. A mathematical model for determining shock wave parameters is given. An example of the calculation of the protective structure constructions against a blast wave in PC LIRA-SAPR (LIRA-FEM) under the action of a surface blast effect is provided. The results of the non-linear calculation of the roof slab for resistance to collapse failure in the case of an emergency explosive impact on an area up to 80 m 2 are presented.