Mechanical Property Analysis Of GFRP Casing Reinforced Concrete Compression Column

GFRP tubed reinforced concrete column is formed by the steel reinforced concrete column with GFRP casing(Glass fiber reinforced materials).GFRP tubed reinforced concrete column,concrete core by GFRP lateral constraint,this constraint makes the core concrete stress condition further complicated the concrete core by uniaxial compression state in three to for ce the complex should be stress state,and the transverse to the role of the constraint can make concrete initial small cracks and voids slowdown,but also to the lateral deformation of the restraint of core concrete.Because of its high corrosion resistan ce and high tensile strength,GFRP is mainly used to replace steel bars and other forms of steel pipe in the engineering structure,which is mainly used in pre-stressed structure and corrosion protection.In order to explain the mechanical properties of re inforced concrete columns with GFRP casing in more detail,the main contents of this paper are as the main contents of this paper:Firstly,a stress-strain model of the core concrete in the FRP casing is presented,which is a kind of FRP casing under uniax ial stress,with the increase of axial strain of core concrete axial stress were obtained development and changes,the calculated results are in good agreement with the experimental results.Based on this model,the influence of concrete strength and pipe wall thickness on the axial stress-strain curve of the core concrete is studied.Secondly,in the previous test,based on the research,using finite element analysis technology,established the GFRP tubed reinforced concrete axial compression column three-dimensional nonlinear finite element numerical analysis model,the calculated results are in good agreement with the experimental results,which verifies the correctness of the model.The GFRP tubed reinforced concrete columns under axial compression by fo rce in the whole process of three-dimensional nonlinear finite element numerical simulation analysis and discuss the casing thickness,concrete strength,length to diameter ratio of the longitudinal distribution reinforcement ratio and other factors,GFRP tubed reinforced concrete columns under axial compression force performance.And it also discusses the failure mechanism by using the model.Finally,according to the mechanical properties of GFRP casing reinforced concrete eccentric compression columns,the three-dimensional nonlinear finite element numerical analysis model of eccentric compression columns was established.The correctness of the model is verified by comparing the calculated results with the experimental results.By using the above model,the three-dimensional nonlinear finite element numerical simulation analysis is carried out on the whole process of the GFRP casing reinforced concrete eccentric compression column.Boundaries of distance of the size of the bias of the preliminary judgment;and,respectively,eccentricity in size from case study the GFRP tubed reinforced concrete column of the load lateral displacement curve,GFRP tube and concrete column cross-section of the stress and strain distribution of;discuss the casing thickness and length to diameter ratio,longitudinal reinforcement ratio and other factors on GFRP tubed reinforced concrete column under eccentric compression mechanical properties influence.