Influence of Geometrical Parameters of the Cross Section, Strength and Deformability of the Materials Used on Stress-strain State of Three-layered Reinforced Concrete

Abstract

New concrete materials and their structures are increasingly diverse, so it requires extensive methods of calculating reinforced concrete structures, including multi-layered reinforced concrete structures. For usage in the practice of modern construction of multilayer structures made of concrete with different physic-mechanical characteristics, it is compulsory to conduct numerical studies of the stress-strain state of these structures under different types of loading. This paper analyzes the effect of cross section and concrete materials for the stress-strain state of three-layered reinforced concrete with light weight concrete in the internal layer and heavy concrete in the external layers. The analysis was carried out on three-layer beam samples with thickness 250mm, external layers of heavy concrete B12.5, B15, B20, B25 and the thickness from 40mm to 120mm; and internal layer from lightweight concrete - polystyrene concrete B0.5, B0.75, B1 and B1.5. The results of the study indicate that when the height and material of the extern layer changes, it greatly affects the stress and deformation state of the three-layer beam under the different loads. The obtained scientific results enable to determine rational parameters about geometric cross-section and materials used for various structural solutions of multilayer reinforced concrete structures. This would limit the number of actual test samples, increasing the efficiency of the experiments and practical production of three-layer structures.