Experimental Research And Reliability Analysis Of Reinforced Concrete Beamsstrengthened With AFRP

Concrete as the main material of building structure, is still being widely used in civil engineering. With the increase of the building into the use of time, environment corrosion, coupled with the poor quality of the construction o f structure, change the use function and natural disasters,external factors and so on, resulting in the structure must be reinforced and repair. Fiber-reinforced composites(FRP) as a new material compared to other building materials, with a high workability and corrosion resistance characteristics. At present the domestic and foreign research on FRP gradually, but most of the scholars study of glass fiber and carbon fiber as the research object, the aramid fiber(AFRP) reinforced concrete structure is less. Aramid fiber with respect to carbon fiber and glass fiber is concerned, has a strong impact resistance, tensile strength and plasticity, and soft easy to bend, more conducive to being applied to the seismic retrofit buildings, tunnels and bridges and other building structures.In this paper, eight reinforced concrete beams as test subjects, and paste the grouping of different layers of reinforced concrete beams of AFRP cloth to study its reinforcing effect. The results showed that: compared with the reference beam significantly enhance the ultimate bearing capacity of reinforced concrete beams strengthened, effective control of the development of deflection, bearing capacit y of the beams strengthened by increased with increasing amount of reinforcement, but strengthened RC beams of the ultimate bearing capacity of reinforced degree is not a linear relationship with the amount of reinforcement of AFRP. To the test as the reference object for each group using ANSYS software test beam finite element analysis, simulation results agree well with the experimental data, the structure of non-linear finite element model is feasible, but the test results and calculation results also exist some differences, mainly due to a preliminary analysis of the concrete test material inhomogeneity and bonding considerations exist between the finite element analysis in the aramid fiber cloth and test beams of the two materials is entirely caused by pasting.Based on experimental beams, on the basis of using the JC method considering load effect ratio at the same time the structure reliability under different load combinations, the change rule of the aramid fiber reinforced concrete beams under flexural bearing capacity design formula of load combination is recommended, and the calculation of reliability of RC beams before and after the reinforcement, analysis of aramid fiber to improve the reliability of reinforced concrete beam under the bending degree of contribution. The results showed that the aramid fiber can effectively improve the flexural capacity of reinforced concrete beams, Reinforcement beam flexural undermine the reliability of the average value of reliability to meet the building structure design ductile failure secondary safety requirements for reliability, and reliabilit y index ratio with increasing load effect under different load combinations and their regular gradually reduced small, for the study of aramid fiber reinforced Concrete Members of reliability analysis to provide a reference.