Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube
9 concrete-filled steel tubular columns with an inner FRP tube(CFT-GT),1 concrete-filled steel tubular column(CFT)and 9 FRP tube confined concrete columns were tested subjected to axial com-pression.The results showed that the ultimate bearing capacity of CFT-GT was higher than that of CFT.With the decrease of the diameter-to-wall thickness ratios of the inner FRP tube(d/t2)or the diameter rati-os of the steel tube to the FRP tube(D/d),the ultimate bearing capacity increased.The circumferential and longitudinal peak strains of CFT-GT increased with the decrease of d/t2.With the D/d increasing,the circumferential peak strains of the inner FRP tube of CFT-GT increased.However,D/d had little influence on the longitudinal peak strains of the inner FRP tube.In addition,it showed that all the ultimate circum-ferential strains of the inner FRP tube of CFT-GT were smaller than that of FRP tube confined concrete col-umns while the ultimate longitudinal strains of the inner FRP tube of CFT-GT was higher than that of FRP tube confined concrete column specimens.Based on the experimental study above,it was pointed out that the relations between circumferential strain and longitudinal strain in all current FRP confined concrete con-stitutive models were not appropriate for CFT-GT composite columns.Hence,a new constitutive model was proposed for CFT-GT composite columns.
concrete-filled steel tubular columns with an inner FRP tubeaxial compressive performanceconstitutive modelultimate bearing capacity
万方数据
维普
