Techno Press
Techno Press

Steel and Composite Structures   Volume 28, Number 5, September10 2018, pages 573-588
Behavior of polygonal concrete-filled steel tubular stub columns under axial loading
Tao Zhang, Fa-xing Ding, Liping Wang, Xue-mei Liu and Guo-shuai Jiang

Abstract     [Full Text]
    The objective of this paper is to investigate the mechanical performances of polygonal concrete-filled circular steel tubular (CFT) stub columns under axial loading through combined experimental and numerical study. A total of 32 specimens were designed to investigate the effect of the concrete strength and steel ratio on the compressive behavior of polygonal CFT stub columns. The ultimate bearing capacity, ductility and confinement effect were analyzed based on the experimental results and the failure modes were discussed in detail. Besides, ABAQUS was adopted to establish the three dimensional FE model. The composite action between the core concrete and steel tube was further discussed and clarified. It was found that the behavior of CFT stub column changes with the change of the cross-section, and the change is continuous. Finally, based on both experimental and numerical results, a unified formula was developed to estimate the ultimate bearing capacity of polygonal CFT stub columns according to the superposition principle with rational simplification. The predicted results showed satisfactory agreement with both experimental and FE results.
Key Words
    polygonal concrete-filled steel tubular (CFT) stub column; ultimate bearing capacity; strain ratio; composite action; compressive behavior
(1) Tao Zhang, Fa-xing Ding, Liping Wang, Guo-shuai Jiang:
School of Civil Engineering, Central South University, Changsha 410075, P.R. China;
(2) Tao Zhang, Liping Wang:
Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province, 410075, P.R. China;
(3) Xue-mei Liu:
School of Civil Engineering and Built Environment, Queensland University of Technology, Brisbane, QLD 4000, Australia.

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