Techno Press

Steel and Composite Structures   Volume 17, Number 5, November 2014, pages 667-686
Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns
Qing-Xin Ren, Chao Hou, Dennis Lam and Lin-Hai Han

Abstract     [Full Text]
    Tapered concrete filled double skin steel tubular (CFDST) columns have been used in China for structures such as electricity transmission towers. In practice, the bearing capacity related to the connection details on the top of the column is not fully understood. In this paper, the experimental behaviour of tapered CFDST stub columns subjected to axial partial compression is reported, sixteen specimens with top endplate and ten specimens without top endplate were tested. The test parameters included: (1) tapered angle, (2) top endplate thickness, and (3) partial compression area ratio. Test results show that the tapered CFDST stub columns under axial partial compression behaved in a ductile manner. The axial partial compressive behaviour and the failure modes of the tapered CFDST stub columns were significantly influenced by the parameters investigated. Finally, a simple formula for predicting the cross-sectional capacity of the tapered CFDST sections under axial partial compression is proposed.
Key Words
    concrete filled steel tube (CFST); concrete filled double skin steel tube (CFDST); tapered column; axial partial compression; cross-sectional capacity
(1) Qing-Xin Ren:
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, PR China;
(2) Qing-Xin Ren, Chao Hou, Lin-Hai Han:
Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China;
(3) Dennis Lam:
School of Engineering, University of Bradford, Bradford BD7 1DP, UK.

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