Advanced Steel Construction

Vol. 12, No. 2, pp.94-108 (2016)


STUDY ON AXIAL COMPRESSION BEARING CAPACITY OF REINFORCED CONCRETE FILLED STEEL TUBE MEMBERS

 

Xiao-Xiong Zha*, Xiao-Li Li, Ning Wang and Cheng-Yong Wan
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
            *(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 30 May 2014; Revised: 30 January 2015; Accepted: 25 June 2015

 

DOI:10.18057/IJASC.2016.12.2.2

 

ABSTRACT:

The bearing capacity equation of reinforced concrete filled steel tube (RCFST) members under axialloads is derived by using the combined unified and limit equilibrium theories. The concrete strength increase due tothe constraint effect of the steel tube is taken into account through the use of unified theory; whereas the concretestrength increase due to the constraint effect of the stirrups is considered through the use of the limit equilibriumtheory. Three-dimensional nonlinear finite element analysis and experimental tests were carried out and thecorresponding results are reported in this paper. The comparisons of the numerical, experimental and theoreticalresults show that there are in good agreement between these three different methods. However, the present theoreticalanalysis model is not only simple and convenient to use but also consistent with existing Chinese design codes forCFST columns.

Keywords:Reinforced concrete filled steel tube, Axial compression bearing capacity, Unified theory, Limitequilibrium theory, Finite element

 

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