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Advances in Materials Science and Engineering
Volume 2016 (2016), Article ID 7261816, 10 pages
http://dx.doi.org/10.1155/2016/7261816
Research Article

Effect of Concrete Age and Creep on the Behavior of Concrete-Filled Steel Tube Columns

1School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
2School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China

Received 4 July 2016; Accepted 19 September 2016

Academic Editor: Doo-Yeol Yoo

Copyright © 2016 HaiYang Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of concrete age and creep on the ultimate axial loading capacity of concrete-filled steel tube (CFST) columns is experimentally and numerically investigated. After validation of numerical models, a parametric study is conducted and the results are used to formulate empirical formulas for predicting the ultimate axial load-bearing capacity of the columns. Formulas are also proposed for predicting both the composite creep and aging coefficients of the CFST columns, which consider the confinement action of steel tubes on concrete. Then, the proposed formulas are validated independently by comparing their predictions with existing test results performed by other researchers. The comparisons show that the empirical formulas have the potential to be used in the practical design of CFST columns.