Axial behaviour of rectangular concrete-filled cold-formed steel tubular columns with different loading methods

Xiushu Qu, Zhihua Chen and Guojun Sun

Abstract

Axial compression tests have been carried out on 18 rectangular concrete-filled cold-formed steel tubular (CFST) columns with the aim of investigating the axial behaviour of rectangular CFST columns under different loading methods (steel loaded-first and full-section loaded methods). The influence of different loading methods on the ultimate strength of the specimens was compared and the development of Poisson's Ratio as it responds to an increasing load was reported and analysed. Then, the relationship between the constraining factor and the strength index, and the relationship between the constraining factor and ductility index of the specimens, were both discussed. Furthermore, the test results of the full-section loaded specimens were compared with five international code predicted values, and an equation was derived to predict the axial carrying capacity for rectangular CFST columns with a steel loaded-first loading method.

Key Words

axial carrying capacity; constraining factor; ductility index; loading method; poisson's ratio; rectangular concrete-filled cold-formed steel tubular; strength index

Address

(1) Xiushu Qu: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, P.R. China; (2) Xiushu Qu, Zhihua Chen, Guojun Sun: School of Civil Engineering, Tianjin University, Tianjin, 300072, P.R. China.

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