Open AccessModel of multilevel formation of normal cracks in reinforced concrete elements and structures
Author(s) -
Olena Romashko,
Vasyl Romashko
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/708/1/012069
Subject(s) - reinforcement , structural engineering , bending , coupling (piping) , nonlinear system , materials science , reinforced solid , reinforced concrete , normal force , limiting , power function , mechanics , composite material , mathematics , physics , engineering , mathematical analysis , mechanical engineering , quantum mechanics
This article proposes a model of multilevel formation of normal cracks. It is based on the most important patterns of adhesion of reinforcement with concrete. The occurrence of the first normal cracks of the first level is calculated by the limiting deformations of stretched concrete, which are fixed by the extreme criterion of its strength. The distances between the cracks are determined by the equilibrium of the maximum forces in the stretched concrete and the forces of active adhesion in the area between the cracks. It is proposed to calculate the force of active coupling by the nonlinear function of the average stresses of this coupling, justified by the power of expression. It is substantiated why for bending reinforced concrete elements the distances between normal cracks of new and previous levels will always differ from each other. In the developed model, the width of the most dangerous normal crack opening is calculated from the positions of successive accumulation of reinforcement and concrete mutual displacements.