Survivability Exposition of a Long-Term Deformable Reinforced Concrete Building Frame Under Accidental Actions

Abstract

AbstractThe survivability study results of the reinforced concrete frame structural multi-storey building system in a non-equilibrium formulation of the problem (initial creep deformations in time and corrosion damage) are presented. A duration preservation analytical assessment of the survivability potential building system in time to the destructive effects of an aggressive environment with the destruction from the structural elements responsible system for the geometric immutability of the structure is given. A technique for determining the stiffness of frame elements taking into account the initial measure of damped simple creep C (t, t0) is presented. An accidental limit state deformation criterion for the considered non-equilibrium problem is constructed from the condition of maintaining the survivability potential. The calculation of a fragment of a reinforced concrete frame was carried out taking into account the nonequilibrium processes of long-term effects and environmental factors when assessing the exposure of its survivability. The calculation of a reinforced concrete frame fragment, taking into account nonequilibrium processes, showed that the reinforced concrete frame survivability depends on the duration of its operation in the building and the degree of its corrosion damage over time. The period of time during which the considered structural system can turn into a kinematically variable system with a hypothetical removal of one of the load-bearing elements, with a special limiting state, will be about 10 years.KeywordsProgressive collapseSurvivability potentialReinforced concrete structuresCreepAccidental actions