Abstract
The mechanical performance of middle long concrete-filled square steel tube (CFST) column with I-shaped CFRP profile inside was studied in this paper. The numerical model of middle long CFST column with I-shaped CFRP profile inside was established by ABAQUS finite element software on the basis of the reasonable constitutive relationship model of material. The whole process curve of load deformation was analyzed, which can be divided into four stages: elastic stage, elastic-plastic rise stage, elastic-plastic decline stage and rebound stage. The model damaged because of buckling in the mid-span. The effect of steel strength and concrete strength, CFRP profile ratio and thickness of steel tube on mechanical performance of middle long column was studied. The bearing capacity of model increased with the increase of steel strength. With the increase of the concrete strength, the ultimate bearing capacity increased, but the ductility decreased. The ultimate bearing capability increased with the increase the CFRP profile ratio and steel tube thickness.
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