Influence of the internal layer cracks on the stress-strain relationship in the external layers of flexural three-layer reinforced concrete members

Most of the techniques usually used for the calculation of flexural layered members do not estimate the influence of the cracks in the internal layer. Although the experimental research clearly indicates that deformations of the external layers are bigger in sections at the crack in the internal layer. The cracks in the external layers also foremost appeared in the sections at the crack in the internal layer. Therefore at least two typical sections must be considered when calculating flexural layered members: the section between the cracks and the section at the crack in the internal layer. The influence of the cracks in the internal layer on the stress-strain relationship in the external layers of the flexural three-layer members is analyzed in this paper.