Finite Element Analysis Of Basic Mechanical Properties Of CFRP Bars Reinforced Concrete Structures

With Chinese reform and opening and the rapid development of the national economic construction,the transportation and civil construction also have been rapid development.However,the bridges and concrete structure of past due to various reasons,cannot satisfy the use requirement;therefore these structures have to apply maintenance reinforcement.But the existing various reinforcement methods have their limitations and defects.Therefore,on the basis of inheriting predecessors' research results,it is imminent to study a new more effective and reasonable reinforcement technique.In recent years,carbon fiber composite materials(CFRP)reinforcement technology is a new and high technical reinforcement method,with its high research and extension value and great social and economic benefits,is gradually familiar to the scholars.Thus,based on the CFRP bars reinforcement,the following contents is discussed as follow:First of all,in this paper,the basic theory of finite element and the numerical analysis of finite element software Final-v11 adopted are introduced;and the test model and material mechanics parameters are stated as well.Then the numerical simulations of two-dimensional and three-dimensional finite element model adopted are explained in detailed.Moreover,all kinds of materials in the process of numerical simulation are also declared.And considering the bond-slip effect between CFRP bars and still and concrete,the zero width quadrilateral sliding unit(Line units)is joined.Then,the paper gives a brief introduction of reinforced concrete loading scheme and loading device.Then,it calculates the theoretical value of the ultimate bearing capacity of the unreinforcement specimen and reinforce specimen,using the theory of ultimate bearing capacity of normal section calculation method.And it combines the experiments of the test results with analysis results,focusing on the 2-D and 3-D numerical simulation analysis results compared with experimental measurements,for determining the more accurate and reasonable numerical simulation model,and verifying the validity of the numerical simulation methods and the rationality of the material constitutive relation used in numerical simulation.Finally,this paper designs three finite element models with different parameter to explore the influence factors of CFRP bars reinforcement technology,i.e.the change of parameters including the number,diameter of CFRP bars,and the bonding situation between CFRP bars and concrete.Then it combines the calculation analysis and the related conclusion to draw some conclusions,which has a certain guidance and reference significance for the CFRP reinforcement of concrete structural engineering.