Method for calculating endurance based on analytical deformations of concrete and reinforcement

Abstract

The strength of reinforced concrete structures under repeated cyclic loads is determined by the strength of concrete or reinforcement, and depends on the conditions of their joint work, as well as the parameters and loading regime. Depending on many factors fatigue failure of the reinforced concrete bending element can occur from: exhaustion of the normal section resource due to fatigue rupture of the longitudinal main reinforcement, or fatigue failure of concrete in the compressed zone; exhaustion of the resource of inclined sections due to fatigue rupture of transverse reinforcement or fatigue failure of concrete over the vertex of the inclined cracks. The results of the study of the fatigue strength of bent reinforced concrete structures indicate that the most common failure occurs from the exhaustion of the fatigue resource of normal sections. To evaluate the fatigue resource of a normal section of a bending reinforced concrete element, a calculation method is proposed based on analytical diagrams of the concrete and reinforcement deformation. The proposed method of calculation makes possible to evaluate the resource of normal sections of bending elements under cyclic loading.