Assessment of the resistance of the hangar protective structure to explosive impacts

The study is dedicated to analyzing the operational suitability of an aircraft shelter structure under explosive and seismic loads, taking into account the specific characteristics of wave propagation through the soil cover. The research examines the reduction in the load-bearing capacity of the roof structures depending on the degree of reinforcement in the structural elements. Particular attention is given to the development of preventive measures against progressive collapse of the shelter’s roof slabs in the event of a potential missile strike. The article explores several explosive impact scenarios to identify the most critical conditions for ensuring the reliability of the hangar structure under emergency situations. The mechanisms of blast wave propagation resulting from a surface explosion are also analyzed. An example calculation of the hangar’s arched structure under explosive wave loading is provided using the LIRA-FEM software for a surface explosion scenario. Results are presented for a nonlinear analysis of the arch and roof slabs under additional impact loading of up to 20 tf/m². The nonlinear loading process was modeled considering soil base damping up to 10% over an area of 80 m², with a dynamic coefficient of 1.2 using the LIRA-FEM software. Emergency load calculations were performed based on specified reinforcement types (TA).