Experimental And Theoretical Research On Axial Stressed Carbon Fiber Reinforced Composite Members

The building structure is developing towards a large span.Except for resorting to reasonable structure,the material must meet the requirement.Because of some features,such as corrosion resistance and high strength,carbon fiber reinforced polymer(CFRP)have been used in building structures.However,due to the lack of enough research on composite materials,the application of CFRP in buildings is still limited.Under the research background of new CFRP cable dome,the pressure bar in the cable dome is taken as the research object in this paper.Combing with theoretical research and test,the bearing capacity of a Pultruded CFRP bars is studied.The main research work in this paper is as follows:1.Study and summarize the theoretical knowledge of CFRP,including the mechanics of composite materials,the finite element methods,the failure criterion,the calculation of the length factor of the pressure bar and so on.Through sufficient theoretical preparation,the foundation for carrying out the research on the axial compression test of CFRP rod is laid.2.Combined with the Hashin failure criterion,the first order buckling mode with L/2000 amplitude is used as the initial defect of the rod.The software ABAQUS is used to established a finite element model to calculate the critical slenderness ratio of the global and local buckling of CFRP bar at hinged ends,fixed ends and ends of the elastic constraint-According to the result,the length of specimen under different boundary conditions is determined and the experiment of CFRP is designed,including the experimental procedure,the strain gauge layout,material statistics,and so on.3.Six different experiments,including the experiment under different boundary conditions,different slenderness ratio and different failure modes are carried out.The experimental process and results are recorded.The experimental results are compared with finite element models,which verifying the rationality of the finite element method proposed in this paper.4.Based on the Perry-Robertson formula,a formula is proposed to calculate ultimate bearing capacity of CFRP bar.Comparing the calculation results with the finite element model and experimental results,the formula is proved reasonable.