Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

Table 1

Material parameters of CFST.

Materials	Yield strength; (MPa)	28-day compressive strength; (MPa)	Young’s modulus; (GPa)
steel	275	—	201
concrete	—	31.2	3.35 × 10^−5

Note. The mix proportions of the concrete were 190 : 400 : 786 : 1065 : 8 (water : cement : sand : aggregate : water reducer).