Stability Study Of Carbon Fiber Reinforced Composite Axial Compression Rod

China's long-span space structure has entered a rapid development stage.The traditional long-span steel structure is prone to corrosion and self-significant,which puts forward higher requirements for materials.In recent years,carbon fiber reinforced composite(CFRP)has attracted people's attention due to its advantages such as high specific strength,large specific modulus and corrosion resistance,and has been increasingly used in long-span space structures.Therefore,the research on the compression rod in the carbon fiber cable dome structure is of great significance.In this paper,the axial mechanical properties of carbon fiber reinforced composite(CFRP)are studied by means of numerical simulation and theoretical analysis.This paper mainly studies the following aspects:1.Based on the axial compression bar test of carbon fiber reinforced composite material of the research group,combined with the two-dimensional Hashin failure criterion,the CFRP axial compression bar finite element model was established with ABAQUS,a large nonlinear finite element software,and comprehensively compared with the test bearing capacity,loaddisplacement curve and failure mode to verify the effectiveness of the finite element model.Put forward different length of axial compression of CFRP bars three failure modes: local material damage,damage and related overall buckling destruction,used to calculate the test section bar ends clamped at both ends,hinged at both ends and elastic support under the boundary conditions of each failure mode between critical length,and analyzes in detail on the other side of both ends clamped and hinge support arm and on the other side of different spring stiffness of elastic supporting rod failure process and characteristics of degeneration.2.Based on the established finite element model,through a large number of parameter analysis,the influences of factors including length-fineness ratio,diameter,wall thickness,diameter-thickness ratio,initial defects,fiber content and other factors on the ultimate bearing capacity of pull-out type axial compression CFRP bars are investigated.3.On the basis of the perry-robertson formula,the formula for calculating the ultimate bearing capacity of pull-type CFRP short and long bars was proposed by piecewise fitting method,and compared with the results of finite element analysis and test,the feasibility of the formula was verified.