Deformation of reinforced concrete slabs on yielding supports under short-time dynamic loading

Abstract

Civil and industrial buildings and structures have lately become more frequently exposed to dynamic impacts caused by emergencies. Such loads are random in nature and are characterized by high intensity and short duration of action. In this regard, protection of structures from these impacts comprises an important scientific and practical problem. One of the ways of possible improvement of structural resistance to dynamic loads of great intensity is the use of yielding supports. This article presents the results of research of reinforced concrete slabs placed on yielding supports. Yielding supports are presented in the form of deformable elements of ring cross-section, which are characterized by three phases of deformation: elastic, elastoplastic, and elastoplastic with hardening. The present research considers behavior of the slab in elastic phase, while behavior of supports is analyzed in elastoplastic and elastoplastic with hardening phases. Conducted studies allowed evaluating the influence of rigidity of yielding supports in the plastic stage of deformation. Research results also allowed explaining the influence of the nature of distribution of rigidities along the perimeter of the slab and the level of deformations of yielding supports at the moment of transition to the stage of plastic deformations on behavior of concrete slabs. According to the results of performed calculations, physical and mechanical parameters of supports have been revealed enabling to get the maximum effect to reduce the stress-strain state parameters of structures.