A New Method for Predicting the UL of Circular CFST Columns

Xinmeng Yu, Baochun Chen

College of Civil Engineering, Fuzhou University, Fuzhou, China.

DOI: 10.4236/ojce.2013.33023                

Abstract

Concrete filled steel tube structures have gained booming development in recent decades, especially in China. Simplified methods have been proposed in design codes, such as the Eurocode 4 (EC4) and the China engineering and construction specification (CECS). In EC4, the confinement effect is reasonably related to slenderness and load eccentricity. The CECS method is much straight forward in that the slenderness ratio and load eccentricity are treated as independent reduction factors. To make use of the advantages of both the CECS and the EC4 methods, the CECS method is modified to consider the confinement effect associated with slenderness and load eccentricity. It is shown that the proposed method can predict well the ultimate load capacity of circular section concrete filled steel tube columns.

Keywords

Concrete Filled Steel Tube Column; Ultimate Load Capacity; Simplified Method; Reduction Factor

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Eurocode 4 (EC4), “Design of Composite Steel and Concrete Structures, Part 1.1: General Rules and Rules for Buildings,” Commission of European Communities, Brussels, 2004.
[2]	American Institute of Steel Construction (AISC), “Manual for Structural Steel Buildings: Load and Resistance Factor Design (LRFD),” Chicago, 2005.
[3]	AIJ, “Recommendations for Design and Construction of Concrete Filled Steel Tubular Structures,” Architectural Institute of Tokyo, Japan, 1997.
[4]	China Association of Engineering and Construction Standardization-CECS 28:90, “Specification for Design and Construction of Concrete Filled Steel Tubular Structures,” China Planning Press, Beijing, 1991.
[5]	The Electric Power Industry Standard of PRC: DL/T 5085-1999, “Code for Design of Steel-Concrete Composite Structure,” Issued by State Economic and Trade Commission of PRC, 1999.
[6]	S. H. Cai, “Modern Steel Tube Confined Concrete Structures (Revised Edition),” China Communications Press, Beijing, 2007.
[7]	J. Y. R. Liew and D. X. Xiong, “Effect of Preload on the Axial Capacity of Concrete-Filled Composite Columns,” Journal of Constructional Steel Research, Vol. 65, No. 3, 2009, pp. 709-722. doi:10.1016/j.jcsr.2008.03.023
[8]	Eurocode 2 (EC2), “Design of Concrete Structures, Part 1-1: General Rules and Rules for Buildings,” Commission of European Communities, Brussels, 2004.
[9]	B. C. Chen, Z. J. Ou, L. Y. Wang and L. H. Han, “Experimental Study on Carrying Capacity of Concrete Filled Steel Tubular Column under Eccentrically Load,” Journal of Fuzhou University-Natural Science Edition, Vol. 30, No. 6, 2002, pp. 838-844.