Blikharskyi Z. Strength and deformability of reinforced concrete beams with damaged main reinforcement under load

In the thesis the bearing capacity, deformability and fracture resistance of bent reinforced concrete elements with damaged main reinforcement under the influence of load are investigated. The introduction substantiates the relevance of the topic of the thesis sets out the purpose and objectives of the research, the connection of work with scientific programs, scientific novelty, practical value of the work, its general characteristics. The first section has review the methods of reinforcement of reinforced concrete structures, the analysis of experimental and theoretical studies of the strength of reinforced concrete beams and the stress-strain state of damaged reinforced concrete structures. The second section contains the program and methodology of experimental studies of bent reinforced concrete elements with damaged main reinforcement under the influence of load. To achieve thesis’ goal and the implementation of research objectives 16 test beams were manufactured. The developed program and method of experimental researches made it possible to study the work of reinforced concrete elements with damaged main reinforcement under the influence of load. The third section presents the results of experimental studies of bent reinforced concrete elements not damaged and damaged under loading. The experimental dates of strength, deflection of damaged beams, depending from the loading level were obtained. The fourth section describes the method of calculating the strength of damaged under loading reinforced concrete bending elements by deformation model. In this section the methodology and algorithm for calculating the load-bearing capacity and stress-strain state of reinforced concrete bending elements with reinforcement’s damages are described. It is also proposed to clarify the calculation of the strength of normal cross sections of reinforced concrete structures, damaged under action of loading. To perform the approbation of the proposed methods, the strength of the normal sections of investigated reinforced concrete beams were calculated according to the proposed algorithms. The comparative analysis showed a satisfactory correlation of experimental and theoretical dates.