PROBLEMS AND METHODS OF EXPERIMENTAL RESEARCH OF THE STRESSED AND DEFORMED STATE OF SUPPORT SECTIONS OF SINGLE BEAMS UNDER THE ACTION OF SMALL CYCLE VARIABLE LOADS

Abstract

The article describes the methodology of conducting experimental studies of the stress-strain state of the support sections of uncut reinforced concrete beams under the action of low-cycle sign-changing loads, the volume, samples and equipment for conducting studies and the tasks of these studies are also given.

     Since this problem has practically not been solved to date, current regulatory documents do not take into account the determination of the stress-strain state of statically indeterminate elements under complex types of loads, in particular under the action of low-cycle sign-changing loads. The proposed truss model does not fully reveal the operation of the support sections of uncut reinforced concrete elements. And the stress-strain state in these areas is quite complex, since in these places there are significant values of transverse forces and bending moments, especially with alternating sign loads. In these areas, transverse cracks appear, which break these areas into blocks, connected in the stretched zone by longitudinal and transverse or inclined reinforcement, and in the upper zone by compressed concrete, the density of which is disturbed by cracks.