Abstract
Beam-column connections of steel reinforced concrete (SRC) structures are complicated and difficult to be constructed due to the densely arranged longitudinal reinforcements and stirrups. One good alternative is to use the composite construction where the reinforcing cage in the SRC column is replaced by an outer thin-walled steel tube, known as tubed steel reinforced concrete (TSRC). This paper presents and discusses the results of an experimental study on the seismic behavior of short circular TSRC columns with a shear span-to-depth ratio of 1.3. A total of 6 specimens using the high strength concrete with fcu,150 = 86.6 MPa were tested under simulated earthquake loading conditions, considering the two main parameters of axial load ratio and the number of shear studs on the steel shape. The short TSRC columns that failed in shear failure mode still showed good ductile behavior due to the effective confinement from the steel tube. Increasing the axial load ratio resulted in an increase of the lateral load resistance and energy dissipation capacity but decreased the ductility and deformation ability of the specimens. The shear studs welded on the steel shape had little effect on improving the seismic behavior of shear-critical circular TSRC columns. A modified ACI design method is proposed to predict the nominal shear strength of circular TSRC columns.
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