The creation of the efficient reinforced concrete structures, that allows to reduce the material consumption as well as the labor costs, is the most important task today. One of the possible ways of solving this problem is the design and wide application of multilayer structures in which high mechanical, heat engineering and acoustic properties are provided due to the combination of high strength of heavy concrete and low strength of light concrete with low heat conductivity. The advantages of three-layer reinforced concrete structures are shown. The proposals have been made to take into account the sag and the classes of lightweight concrete of such elements.
The article deals with the method for calculating the three-layer bent reinforced concrete elements, taking into account the total deformation diagrams of different concrete layers. There are formulas and calculations in cases of presence and absence of cracks in the tension zone.
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