Research On Axial Compression Members Of Glass Fiber Reinforced Composites

Large span and large open room building structures are gradually becoming the mainstream direction of the construction of large-scale venues in today’s cities,and cable dome structure is one of the preferred forms of such buildings because of its excellent characteristics.In this paper,based on the research project of a new type of cable dome structure made of Fiber Reinforced Polymer(FRP),the stability performance of compressive member in the cable dome — — Glass Fiber Reinforced Polymer(GFRP)circular pipe is experimentally and theoretically studied.The specific contents are as follows:In this paper,the constitutive relationship,fabrication process and engineering application of GFRP materials are briefly introduced.Two-dimensional Hashin failure criterion and progressive failure analysis method of composite materials are applied to the analysis of GFRP axially compressed circular tubes.The specific method of finite element modeling analysis is introduced,and three failure modes of GFRP circular tubes with different slenderness ratios are summarized.Pultruded GFRP circular tubes with cross sections of Φ24-2,Φ30-2 and Φ31.4-3.2、slenderness ratio ranging from 6 to 51.2、boundary conditions of fixed support at both ends and cutter-hinge support at both ends were tested under axial compression.The ultimate bearing capacity,failure mode,load-axial displacement curve,load-transverse maximum displacement curve and stress-stress curve at different parts of the rod and other test results were obtained.The finite element model is validated by the test results.The calculated results are in good agreement with the test results.Taking the stability theory of steel structure as a reference,the section edge yield criterion of equivalent initial bending is introduced to calculate the stability bearing capacity of GFRP axially compressed circular tubes,and compared with the test results,the modified Perry formula of the stability bearing capacity of pull-extruded GFRP axially compressed members is deduced.The calculation results are safe.