ANALYSIS OF PANEL BUILDINGS UNDER PROGRESSIVE COLLAPSE

Abstract

The article examines the conditions for maintaining the spatial integrity of a structural system under destructive impacts. The methodology is based on spatial numerical modeling that incorporates both physical and geometric nonlinearity of the object. The calculations are performed using the finite element approach to reproduce changes in the stress–strain state. The scenarios involve the instantaneous removal of vertical supports in different zones of the building plan. The evaluation of results relies on a system of generalized criteria that reflect the ratio of applied loads to structural capacity. The algorithm accounts for the level of stress concentration and the degree of localization of destructive processes. The obtained results demonstrate a non-uniform redistribution of internal forces between adjacent panels. Critical zones emerge in connection joints and neighboring structural components. Internal damage leads to a more intensive increase in displacements compared to corner scenarios. The observed development of plastic deformations determines the subsequent failure mechanism of the system. The presence of additional ties alters the trajectories of force transfer within the structural framework. Increasing joint stiffness reduces the risk of transition to global instability. The practical significance of the study lies in the development of engineering solutions for strengthening panel structures. The proposed methods for joint enhancement ensure a reduction of stresses in critical sections. Optimization of the load transfer scheme enables effective localization of damage at early stages. The results provide a basis for the design of new structures and the reconstruction of existing buildings. The scientific novelty consists in the comprehensive consideration of the nonlinear behavior of reinforced concrete elements. The quantitative identification of damage localization parameters improves the accuracy of predicting failure scenarios. The study confirms the effectiveness of introducing redundant ties to prevent progressive collapse. The application of refined models expands the capabilities for assessing the residual capacity of buildings. The developed approach reduces the cost of structural safety measures while maintaining reliability.