Mechanical behavior of outer square inner circular concrete-filled dual steel tubular stub columns

Fa-xing Ding, Wenjun Wang, Xue-mei Liu, Liping Wang and Yi-Sun

Abstract

The mechanical behavior of the outer square inner circular concrete-filled dual steel tubular (SCCFT) stub columns under axial compression is investigated by means of experimental research, numerical analysis and theoretical investigation. Parameters such as diameter ratio, concrete strength and steel ratio were discussed to identify their influence on the mechanical properties of SCCFT short columns on the basis of the experimental investigation of seven SCCFT short columns. By establishing a finite element model, nonlinear analysis was performed to discuss the longitudinal and transverse stress of the dual steel tubes. The longitudinal stress characteristics of the core and sandwich concrete were also analyzed. Furthermore, the failure sequence was illustrated and the reasonable cross-section composition of SCCFT stub column was proposed. A formula to predict the axial load capacity of SCCFT stub column was advanced and verified by the results from experiment and the finite element.

Key Words

SCCFT stub column; diameter ratio; finite element analysis (FEA); failure sequence; ultimate loading capacity; theoretical formula

Address

Fa-xing Ding and Liping Wang: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P.R. China; Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Wenjun Wang and Yi-Sun: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P.R. China Province, Changsha, 410075, P. R. China Xue-mei Liu: Department of Infrastructure Engineering, The University of Melbourne, Parkville, VIC 3010, Australia

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