Advanced Steel Construction

Vol. 10, No. 2, pp. 139-150 (2014)


AXIAL STRENGTH OF CFST COLUMNS CONSIDERING CONCRETE AGE

 

Hai-Yang Wang and Xiao-Xiong Zha *

Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, PR China

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. and This email address is being protected from spambots. You need JavaScript enabled to view it. )

 

Received: 8 September 2012; Revised: 21 November 2012; Accepted: 13 March 2013

DOI:10.18057/IJASC.2014.10.2.2

 

ABSTRACT:

Concrete filled steel tube (CFST) columns are used increasingly in high-rise buildings in China. During the rapid construction of high-rise buildings, concrete age is an important factor which will affect the composite axial strength. In this paper, based on the theory of elasticity, a formula is proposed to predict the composite axial strength of CFST considering the concrete age. For the most common use the parameters in the formula are simplified and calibrated by existing test results. Finally the experiments of the ultimate bearing capacity of CFST columns considering concrete age changes are carried out and the FE method is also adopted to validate the formula results. The results show that the formula can be used satisfactorily in predicting the strength of CFST columns considering concrete age.

 

Keywords:CFST, composite strength, concrete age, axial strength

 

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