Computer Simulation Analysis On Flexural Character Of The CFRP Concrete Beams And Prestressed Concrete Beams

Reinforced concrete structures are combination with two very difficult material (reinforcing steel bars and concrete),moreover the concrete often endure loads with crack. The inherent complex nonlinear characters of concrete material and reinforcing steel bars and intricate felt identity between them, which entail many difficulties in finite element method analysis ,many scholar both in domestic and overseas have worked much in this field. But they had not bring forth the theory and method on computer simulation of reinforced concrete systematicly.Theoretic solution of reinforced concrete based on much test data, which adopt presume of "plane section" to analyse the stress-strain relation, but this will not only have some localization for the complex structures, but also have not accept the whole process force-distortion relation curve and the stress curve of the reinforced bars and concrete in time. Based on the research of predecessors, this paper analyse the flexural ultimate strength of reinforced concrete beams and CFRP reinforced concrete beams and longitudinal crack bottom plate and flexural ultimate strength of pre-tensioned concrete hollowbeam with nonlinear finite element method, emphasis research on model establishment, mesh demarcate , parameter selection, element type , converge criterion , boundary disposal and solution method, where there are many materials in analysis, such as concrete, reinforcing steel bars, CFRP, etc. every material has intricate nonlinear character, discuss the simulation analysis method of reinforced concrete beams strengthened with carbon fiber sheet and pre-tensioned concrete hollow beams through select reasonable constitutive equation.The proper mathematical model of the entire process simulating ultimate strength, physical model and mechanical model are given in this paper are adopted in ANSYS and its update. The agreement of FEM result between the experiment result is satisfactory. The result of this paper has reference value of structure strengthening engineers and researchers in reinforced concrete and prestress concrete.