Ahaieva O. Design reliability of span reinforced concrete structures

Object of research – variability of stress-strain state parameters of beam reinforced concrete structures with prestressed main reinforcement; goal – development of mathematical models for regulating the design reliability of span prestressed reinforced concrete structures in the recommended limits with the assurance of their bearing capacity by the first group of limit states and minimal consumption of materials, taking into account the variability of physical and mechanical properties of concrete and reinforcement; methods – collection, study and analysis of literature sources, formulation of research tasks, analysis of the obtained results, formulation of conclusions and recommendations, determination of design reliability of full-scale structures according to the proposed recommendations; the use of experimental design techniques and proven probabilistic-statistical methods of the analysis of random variables; results – new estimates of prestress losses and acting forces scatter in the reinforcement, coefficients of variation of the strength of normal and oblique sections, as well as reliability indexes of span prestressed reinforced concrete structures were obtained; novelty – 12 adequate mathematical models were developed that allow not only to predict accurately the reliability of specified structures and estimate the degree of influence of the most important constructive factors on its magnitude, but also to investigate the direction of the common change in bearing capacity and reliability index with the change of these factors; an algorithm of regulation of design reliability of span reinforced concrete structures with prestressed reinforcement is proposed; implemented – into educational process of OSACEA during the masters training, as well as into the design practice of construction organization «Chernomorgidrobud».