Strength resistance of reinforced concrete elements of high-rise buildings under dynamic loads

Abstract

Abstract.A new method for calculating reinforced concrete constructions of high-rise buildings under dynamic loads from wind, seismic, transport and equipment based on the initial assumptions of the modern phenomenological theory of a nonlinearly deformable elastic-creeping body is proposed. In the article examined the influence of reinforcement on the work of concrete in the conditions of triaxial stress-strain state, based on the compatibility of the deformation of concrete and reinforcement. Mathematical phenomenological equations have been obtained that make it possible to calculate the reinforced concrete elements working without and with cracks. A method for linearizing of these equations based on integral estimates is proposed, which provides the fixation of the vibro-creep processes in the considered period of time. Application of such a technique using the finite-difference method, step method and successive approximations will allow to find a numerical solution of the problem. Such an approach in the design of reinforced concrete constructions will allow not only more fully to take into account the real conditions of their work, revealing additional reserves of load capacity, but also to open additional opportunities for analysis and forecasting their functioning at various stages of operation.

Exploitation of reinforced concrete constructions on a ground base with force and environmental influences

“…This is due to the fact that the vast majority of the operated structures, buildings and infrastructure facilities were erected more than half a century ago and are in a worn-out condition. For constructions of buildings and structures operating in intensive operational mode and adverse environmental influences, degradation processes associated with the development of corrosion processes are manifested, which shorten the expected service life [1][2][3][4].…”