Finite Element Analysis On Mechanical Behavior Of The Reinforced Concrete Strengthened With CFRP

Carbon fiber reinforcement technology as an emerging reinforcement technology, has become wider in the reinforcement industry in recent years, when compared with the traditional reinforcement techniques, Carbon fiber reinforcement technology has many advantages, such as simple construction, anti-corrosion, light weight, high strength and so on, A large number of tests and theoretical research have been put into the reinforcement technology at home and abroad, and accumulated a lot of experimental data and theoretical results, These results will provide an important basis for our follow-up study.This article is based on tests done by our predecessors, Simulate different forms of reinforced concrete beams by using of ANSYS finite element software, Comparison with the experimental results, continuously improve the finite element model, And use a reasonable finite element model to study the mechanical properties of reinforced concrete beams, the main aspects of this study include the following:Through Searching a large number of documents, select the appropriate test model, Then finish the test data and plot the load - displacement curves and load - strain curve of the different forms of reinforced concrete beams, And by analyzing and summarizing the process of testing, test results, provide basis for the ANSYS finite element analysis.Study the finite element model of the carbon fiber reinforced concrete beam, especially for the selection of model elements, material parameters, material constitutive relation and convergence criteria Etc. A reasonable set of these factors is the basis for the correct finite element model.Based on the test parameters, using ANSYS finite element software to simulate the bending performance of the different forms of reinforced concrete beams, And to study the model of deflection, stress, strain and so on, Then draw the load - deflection curves, load - strain curve of the different reinforced concrete beams, afterward, compared the various curves with the experiment Obtained, Come to the conclusion that, in the use of ANSYS calculation of ultimate bearing capacity of beams, the calculated values to be lower than the test value. In addition, through compared with the ultimate bearing capacity of different layers of carbon fiber reinforced, the Ultimate bearing capacity improve significantly with the carbon fiber layers increase.From the finite element analysis of load - deflection curve we can see that with the increase of carbon fiber layers, mid-span deflection is reduced in the same loading conditions, This explains the existence of CFRP can improve the flexural stiffness of concrete beams, In addition, compared with the experimental calculated values, Finite element method calculated the bending stiffness of Concrete Beams greater.The study of the load - strain curve on carbon fiber and reinforced , we can conclude that with the increase of carbon fiber layers, both the strain is reduced in the same loads. In addition, from the load-strain curves obtained by the experiments and finite element calculated we can see that finite element calculate the value of the strain is greater than the value measured by experiment in the same Loads.By studying the crack morphology of different forms of test beams reinforced, we can draw that the existence of carbon fiber can delay the development of the cracks and change the form of cracks.The amount of CFRP we used influence the ultimate bearing capacity of beams, Ultimate bearing capacity of the beam to a certain extent, is increased with the increasing of carbon fiber cloth. However, this reinforcing effect was established based on assumptions that Concrete will not be crushed or carbon fiber and concrete does not occur the debonding failure. In addition, the reinforcement efficiency is reduced with the reinforcement layers increases.High reinforcement ratio and high concrete strength grade could significantly improve the ultimate strength of concrete beams, However, the high reinforcement ratio increased carrying capacity was established based on assumptions that the concrete will not be crushed in the Compression zone, The high-strength concrete can only improve the ultimate bearing capacity of concrete beams based on assumptions that carbon fiber is not pulled off or does not occur the debonding failure.