Experimental Study On Shear Behaviours Of CFPR Tendons Reinforced FRCC Flexural Components

Reinforced concrete structure is the most commonly used structure form in the field of civil engineering. However, problems such as corrosion and deterioration of reinforced concrete structure appear frequently as time goes on, of which the most common one is the corrosion of steel. This will not only affect the serviceability of engineering structures, but also generates hidden dangers of accidents. Meanwhile, the problem of high self-weight also exists in reinforced concrete structures. Substituting the longitudinal bars and stirrups carbon with fiber reinforced composite (CFRP) and substituting the concrete with fiber reinforced cementitious composite (FRCC) is an effective method to form a new combination of materials with better physical and mechanical properties, which can reduce the self-weight and improve the durability of the structures effectively.The main purpose of this paper is to study the shear behavior of CFRP reinforced FRCC flexural members. Firstly, the basic mechanical properties of CFRP longitudinal bars, CFRP stirrups and FRCC are obtained through experiments. Then the experiments of 6 CFRP reinforced FRCC simply supported beams with rectangular cross section under concentrated loads is conducted, through which the failure process, shear bearing capacity, failure mode, deformation characteristics and the properties of new materials are studied.Through the analysis of experimental data, the effects of shear span ratio and stirrup ratio on shear capacity of FRCC beams strengthened with CFRP bars is acquired, and the characteristics of FRCC beams strengthened with CFRP bars during the loading process is revealed. In this paper, the shear capacity of the test beam is calculated according to the FRP codes in various countries, and the results are compared with the measured values. Compared with the standard FRP reinforced concrete beams, the shear bearing capacity of CFRP reinforced FRCC beams is much higher, and the measured values are almost 2 times of the calculated values of the national standards. On the basis of the experiment, the shear capacity of CFRP reinforced FRCC beam is discussed based on the modified compression field theory. Finally, the finite element analysis of CFRP reinforced FRCC beam is carried out in ABAQUS, and the simulation results match well with the experimental ones.