INVESTIGATION OF THE STRESS-STRAIN STATE OF BUILDING STRUCTURES DAMAGED BY EMERGENCY SITUATION

The article investigates the stress-strain state of building structures damaged due to an emergency situation resulting from a missile strike on a building in Odesa. The study aimed to comprehensively analyze the technical condition of the damaged structure, evaluate the impact of the missile strike on bearing capacity and deformation behavior, and provide recommendations for restoration. The authors conducted detailed instrumental inspections utilizing non-destructive testing techniques, performed topographic and geodetic surveys to determine structural verticality, and carried out verification analyses using the "LIRA-SAPR" software. Significant damages to columns, floor slabs, and external walls were identified, creating a risk of progressive structural collapse. The structures were classified as being in an emergency state, with damage levels reaching up to 80%. The proposed restoration measures involve dismantling and reconstruction of damaged elements, reinforcement of load-bearing structures using metallic components, installation of temporary support systems, and ongoing structural health monitoring. Particular attention was paid to determining the actual concrete strength, corresponding to the concrete class C20/25 (B25). Reinforcement parameters, such as the diameter and concrete cover thickness of the working reinforcement in columns and floor slabs, were also investigated. It was found that the actual concrete cover thickness significantly deviated from standard values, which must be considered when planning restoration and reinforcement measures. The research underscores the importance of adopting a comprehensive approach to analyzing damaged buildings, incorporating modern techniques such as 3D scanning for accurate spatial modeling and minimizing design and restoration errors. The obtained results can improve the effectiveness of design solutions for the reconstruction of buildings damaged by emergency situations and contribute to developing advanced methodologies for assessing structural integrity and operational reliability in comparable scenarios.