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Steel and Composite Structures
  Volume 22, Number 3, October30 2016 , pages 663-675

Experimental study on the compression of concrete filled steel tubular latticed columns with variable cross section
Yan Yang, Jun Zhou, Jiangang Wei, Lei Huang, Qingxiong Wu and Baochun Ch

    The effects of slenderness ratio, eccentricity and column slope on the load-carrying capacities and failure modes of variable and uniform concrete filled steel tubular (CFST) latticed columns under axial and eccentric compression were investigated and compared in this study. The results clearly show that all the CFST latticed columns with variable cross section exhibit an overall failure, which is similar to that of CFST latticed columns with a uniform cross section. The load-carrying capacity decreases with the increase of the slenderness ratio or the eccentricity. For 2-m specimens with a slenderness ratio of 9, the ultimate load-carrying capacity is increased by 3% and 5% for variable CFST latticed columns with a slope of 1:40 and 1:20 as compared with that of uniform CFST latticed columns, respectively. For the eccentrically compressed variable CFST latticed columns, the strain of the columns at the loading side, as well as the difference in the strain, increases from the bottom to the cap, and a more significant increase in strain is observed in the cross section closer to the column cap.
Key Words
    concrete filled steel tubular latticed columns; axial compression; eccentric compression; stress mechanism; failure mode; load-carrying capacity
(1) Yan Yang, Jun Zhou, Jiangang Wei, Qingxiong Wu, Baochun Chen:
College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
(2) Lei Huang:
College of Civil Engineering and Architecture, Wuyi University, Nanping 354300, China.

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