Concrete Filled Steel Tubes

Concrete filled steel tubes cft for bridge foundations and substructures.

Concrete filled steel tubes.

In current international practice cft columns are used in the primary lateral resistance systems of both braced and unbraced building structures. Concrete filled steel tubes cfts are composite members consisting of an steel tube infilled with concrete. Performance of concrete filled thin walled steel tubes under pure torsion 1. 9 3 1 mechanical characteristic and mechanism.

Concrete filled steel tube cfst structure is a composite structure and consists of a steel tube that is filled up with concrete. There exist applications in japan and europe where cfts are also used as bridge piers. Charles roeder dawn lehman. Introduction concrete filled steel tubes cft uses the advantage of both steel and concrete infill concrete in steel tube delays local buckling steel tube reinforces the concrete to resist tensile forces improves its compression stress and ductility 5.

Typical cft cross sections 6. If the spiral bar in a concrete column is very closely spaced and it is combined with the longitudinal reinforcement and the cover concrete is cancelled the steel tube confined concrete or the concrete filled steel tube is then formed. Zhenhai guo in principles of reinforced concrete 2014. Olympia wa march 23 2010.