FEATURES OF THE STRESSED AND DEFORMED STATE OF SUPPORT SECTIONS OF NON-DIVIDED REINFORCED CONCRETE ELEMENTS UNDER THE ACTION OF SMALL CYCLE VARIABLE LOADS

Abstract

Based on the results of experimental studies by the authors and other researchers, the article presents an assessment of the stress-strain state of inclined sections of three-supported sections of single-span and continuous beams under the action of low-cycle alternating loads and its change depending on the ‘cut’ arm of the external forces.

Inclined sections at the supporting sections near the middle supports of continuous reinforced concrete elements have the highest stress-strain state, especially at the first intermediate support. This section is subject to the maximum bending moment and maximum transverse force arising from the external load. If the load is cyclic alternating, the stress-strain state in this section becomes more complicated, even at operating levels of η=(0.5...0.6)N_u. Since there is no characteristic of such a stress-strain state in statically indeterminate bending elements under the action of the above loads in the current regulatory documents, the study of its features is promising.

In this article, based on the analysis of those few publications by the author and other authors, the tasks of further experimental and theoretical study of the features of the stress-strain state of inclined sections at the support areas above the average supports of continuous bending elements under the action of few cyclic alternating loads are set.