In order to study the performance of high-strength concrete filled square steel tubular beam with inner CFRP circular tube and how CFRP and steel ratio affect it,5 highstrength concrete filled square steel tubular beams with inner CFRP circular tubes and 3 high-strength concrete filled square steel tubular beams were tested.

The force characteristic of high-strength concrete filled square steel tubular short columns with inner CFRP circular tube is researched to solve the problem of practical construction.

In order to study the performance of columns of high-strength concrete-filled square steel tubes with inner carbon fiber reinforced polymer(CFRP) circular tube,the contrast tests of bearing capacities of 4 columns of high-strength concrete-filled square steel tubes with inner CFRP circular tube,and 4 columns of high-strength concrete-filled square steel tubes were made.

Experimental study of the torsion behavior of concrete filled circular CFRP-steel tubes

Based on experiment and stress-strain curves of concrete confined by circular steel tube that suitable for finite element analysis,stress-strain curves of concrete confined by circular CFRP-steel tube that suitable for finite element analysis are proposed.

Experimental results of 12 short columns are analyzed,which are the high-concrete filled square steel tube with inner CFRP circular tube under axial compressive load.

The constitutive relationship of concrete confined by circular CFRP-steel composite tube under concentrical load is researched in order to fulfill whole loading procedure analysis and simplify the calculation of concrete confined by circular CFRP-steel tubular structures.