The full-scale test of bearing structures of the shelter to assess the possibility of its further operation

Today, military operations continue in Ukraine, and the need for protective structures is increasing. The scientific work describes the structural scheme of the existing shelter, including the determination of cross-sectional dimensions, thicknesses, concrete strength, and reinforcement strength of the shelter frame, as well as the external reinforced concrete walls. To achieve this, both mechanical openings, various ultrasonic and other measuring devices were used. The type and dimensions of the foundations for the columns and the outer walls of the shelter were determined by digging. The general technical condition of the shelter's bearing structures and their damage levels have been determined based on research findings. The control calculation of the bearing capacity of the shelter structures allowed us to determine the required payload, which would simulate the load from the blast wave. At the same time, the maximum bearing capacity of all shelter structures and the values of averaged (redistributed) moments, obtained from the static calculation of a multi-span continuous roof slab, were determined. A proposed strengthened option for the roof structures of the shelter is presented. Based on this, conclusions were drawn that will enable future improvements in the durability and service life of protective structures, and during new construction, to take into account the shortcomings identified in the last century when constructing the shelter under study.