Behavior of concrete filled steel tube, sand filled steel tube and hollow steel tube

Abstract

Composite column consisting Concretefilled steel tubes have become increasingly popular in
structural application around the composite Concretefilled steel tubes are economic column type, the
majority of axial load type is resisted by the concrete,
which is less expensive than steel. Further, economic
can be obtain by using high strength concrete with thin
walled steel tubes using just sufficient steel to supports.
the construction load prior to filling with concrete
composite column consisting of Concrete-filled steel
tubes of traditional concrete filled column, the problem
of concrete cover spoiling can be avoided, furthermore,
inward buckling of the steel is prevented by the steel
core , thus increasing the stability and the strength. if
the column as a system. the improved strength of the
circular steel tubes filled with concrete is to the
influence of bond strength between the steel tubes and
concrete rather than lateral restrain and the strength of
circular steel tubes can be significantly influence by
local buckling. the local buckling has been consider by
restricted the allowable diameter to thickness ratio.
For compression member l/d < 50
The main aim of this study was to increase the
knowledge of structural behavior of composite column
consisting of circular hallow steel section filled with
concrete. The main topic of insert were to study how the
behavior of column was influenced by
 The bond strength between the steel tubes and
the concrete core.
 The increase concrete compressive strength
due to confinement of steel and
 Compare of behavior of CFST concrete, sand
filled steel tube and hollow steel tube.