Abstract
In recent years, a new steel-concrete composite member, known as a concrete-filled double-skin steel tube (CFDST), has gained interest in the construction industry due to its attractive properties such as ease of construction, light weight, high strength, and good seismic resistance. A CFDST member is simply made from two concentrically placed steel skins filled with concrete in between and it utilizes the advantages of both steel and concrete. Under axial compression, due to the different Poisson’s ratios of steel and concrete, the concrete of a CFDST column is normally in a triaxially confined state and consequently the confining pressures can effectively enhance the strength and the ductility of the concrete which is known as the confinement effect.
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