Abstract
The chapter introduces an innovative concrete-filled steel tubular (CFT) column for improved seismic design of steel and concrete composite structures. The design concept is aimed at controlling the local buckling of steel tube and confining the concrete in potential plastic hinge zones of a CFT column. Several efficient details of transverse confinement are examined through experimental testing. The new type of CFT column, named as CCFT, is expected to overcome many disadvantages of the conventional CFT column and provide a better choice for structural design of tall buildings in seismic regions. Experimental tests validated the concept of CCFT. The steel tube is expected to carry stresses in longitudinal direction caused by axial loading and moments, as well as transverse stresses caused by shear and internal passive pressure due to concrete deformation, i.e., the confining stress.
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