Stress-strain Analysis of Reinforced Concrete Beam Strengthened with Carbon Fibre

Abstract

The paper presents results in experimental studies of a reinforced concrete beam strengthened in the upper and lower zones as well as with carbon fibre-based composite material. The authors consider the current practice of using carbon fibre as part of strengthening concrete structures, the current regulatory documents of using carbon fibre in the Russian Federation, regulatory documents containing information on strength and stress-strain properties of carbon fibre. The paper provides information on loading scheme, beam support conditions, the geometry of a reinforced concrete beam, physical properties of concrete and reinforcement of a sample; technical specifications of elements strengthened with carbon fibre. The results are presented by a curve of structural deflection under load in the conditions where the beam is tested without cracks and with cracks before reinforcement, and also with reinforcement. The studies presented in the paper show that the use of carbon fibre as reinforcement of bending structures allows us to increase the bearing capacity, rigidity and crack resistance of bending reinforced concrete elements.