ABOUT USE OF A HYPOTHESIS OF FLAT SECTIONS IN FERRO-CONCRETE
The authors reject the flat cross-section hypothesis even for the average strain of concrete and rebar in the development of calculation of reinforced concrete structures. The analysis of strain state of reinforced concrete structures shows that the model of composite rod is most appropriate for the calculation. Considering that, the paper presents some determined necessary parameters of the cross-section of an eccentric-compressed reinforced concrete structure with the assumed diagram of average strain of concrete and reinforcement in the cross section, taking into account conventional mutual displacements of concrete and reinforcement.