THE FIELD OF CRACKS DIRECTIONS IN REINFORCED CONCRETE BENDING ELEMENTS STRENGTHENED BY THE EXTERNAL COMPOSITE REINFORCEMENT

Abstract

The design projection of the inclined section is an important factor in the estimation of strength of reinforced concrete structures by inclined sections. The problem of determination of the crack inclination angle is also essential for the elements strengthened by the external composite rein-forcement. The method of the inclination angle determination in any point along the span of strength-ened bending element is proposed. The design inclination angle of a crack corresponds to the minimum of external load causing its opening, which is obtained from the energy balance equation. The calculations of bending elements strengthened by composite materials have been carried out. The ob-tained dependence of cracks inclination angles on the conventional to composite reinforcement ratio and on the coefficient of the bilinear section hypothesis.