Concrete Filled Steel Tubes (CFST)

The Concrete Filled Steel Tube (CFST) Structural System is a completely new system based
on filling steel tubes with high-strength concrete. A CFST member contains two materials
with different stress-strain curves and distinctly different behavior. The interactions of the two
materials give difficult problems in the determination of combined properties such as moment
of inertia and modulus of elasticity. The main objective of this research is to determine
compression behavior of CFST with ordinary concrete and high strength concrete under axial
load and emphasis on identifying behavior of relevance to offshore applications. The CFST
specimens were tested under axial load to clarify the effect of the test parameters on the
behavior. The tested samples of CFST were observed and discussed in this report.