Abstract
In this paper, a novel square coral concrete-filled duplex stainless steel tube (SCCFDSST) is proposed, and its axial compressive behavior is systematically investigated. Totally forty-five square steel columns welded with 2205 duplex stainless-steel plates are tested. Forty-two specimens are filled with coral concrete, and three columns are hollow steel tubes. The influential critical factors include the strength of coral concrete, the width-to-thickness ratio of steel tube and the constraint factor of SCCFDSST. The results indicate that SCCFDSSTs present satisfying ductility and bearing capacity. Moreover, the composite action provided by coral concrete and duplex stainless-steel tubes (DSST) is significant. For the purpose of guiding structural design, a mechanical model is established to determine the sectional capacity and the relationship between axial load and axial deformation of SCCFDSST. The accuracy of proposed formulas has been fully validated by experimental results, presenting higher precision than that of existing specifications. The results of this research can provide guidance for the application of the novel columns in engineering structures.
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