DESIGN ASSESSMENT OF THE RELIABILITY OF CONTINUOUS REINFORCED CONCRETE BEAMS UNDER LOW-CYCLE REPEATED AND ALTERNATING LOADS OF DIFFERENT LEVELS

Abstract

Based on the conducted experimental studies of the authors and other researchers in the article, using the existing methodology for calculating the reliability of building structures under the action of single static loads, based on probabilistic methods plus calculations of the reliability assessment of non-split concrete beams, testing the of low-cycle repeated and alternating loads, were performed.

The limit state method, laid down in the current standards, allows you to ensure the necessary bearing capacity of the specified structures by using various coefficients of reliability and responsibility of the structure. However, sufficient bearing capacity of the element does not guarantee its sufficient reliability, the quantitative assessment of which at the stage of project development is unknown. Moreover, with a change in the initial constructive factors adopted in the calculation (classes of concrete, reinforcement), the directions of change of these characteristics and their physical and mechanical, strength and deformation properties, during the operation of structures, may generally be different, since the value of reliability is of a random nature.

As a result of the research, numerical examples of reliability calculations of non-split two-span beams under the action of low-cycle repeated and alternating loads are presented.