Crack Resistance of Reinforced Concrete Structures of Round Sections

Abstract

In this paper, the issues of developing a calculation method for the formation of cracks normal to thelongitudinal axis of bent reinforced concrete structures of circular cross­section without prestressing the reinforcement on the basis of a nonlinear deformation model using a bilinear diagram of the state of concrete are considered. The prerequisites on the basis of which theoretical dependences are constructed to determine the complex of internal forces of a round normal section before the formation of cracks are presented. On the basis of stereometry, dependencies are presented to determine the forces in the concrete and reinforcement of the compressed zone and the forces in the stretched zone, respectively, for concrete and reinforcement. Since it is difficult to analytically solve a system of equations with negative and positive exponents, it is recommended to carry out numerical iterative processes to determine the desired unknowns: heights of the compressed zone, maximum stresses in concrete and reinforcement of the compressed zone.