Abstract
Recently, there has been an increasing interest in utilizing circular Concrete-Filled Double-Skin Steel Tubular (CFDST) columns in modern buildings. As a typical member in large-span building structures, the Concrete-Filled Double-Skin Steel Tubular column with Large Hollow Ratio (LHR-CFDST) is characterized by a tapered shape and a hollow ratio larger than 0.75. In engineering practice, this type of column is commonly subjected to a combination of compression, bending and torsion. This paper presents an experimental study on the tapered LHR-CFDST column under combined compression-bending-torsion loads. Specimens with different tapered angles, hollow ratios, bending-to-torsion ratios and axial compression ratios were tested. The failure mode, load versus displacement relation, strain response and effects of important parameters were discussed. The ultimate strength and mechanism of tapered LHR-CFDST columns under combined loads were analysed. The feasibility of predicting the ultimate strength of tapered LHR-CFDST columns using the existing methods was evaluated based on the experimental data.
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