Failure Mechanism of Reinforced Concrete Frames Under Accidental Impacts

The collapse of building objects during design, construction and operation is present throughout modern civilization. This article studied in detail the features of the exhaustion of the bearing capacity and the nature of the destruction of four series of experimental studies of monolithic reinforced concrete frame structural systems, which differ in the nature of the destruction of the sections (brittle or plastic), as well as the use of such methods of protection against progressive collapse, such as prestressed elements and indirect reinforcement. As the initial prerequisites for the calculation analysis, a diagrammatic calculation method was used, using the actual static-dynamic parameters of the “strain stress” diagrams for reinforcement and concrete, adopted in the current standards for the design of reinforced concrete structures. When assessing the nature of the destruction of the supporting sections (localization of cracks and the depth of their development), a satisfactory convergence with the accepted model of static-dynamic deformation of structural materials adopted for the calculation analysis was established. The considered and experimentally tested technical solutions make it possible to implement such stiffness characteristics of the design scheme, in which energy dissipation occurs without disturbing the geometric variability of the building’s supporting system.