The Ultimate Strength of the Concrete-Filled Tubular (CFT) Section Columns

Abstract:

This paper describes design strength of concrete-filled tubular (CFT) section columns accounting for local buckling of steel skin. The local buckling has a negative effect on the ultimate compression strength based on the yield stress of steel skin and nominal compressive strength of in-filled concrete. A squash load formula for CFT stub columns is proposed to account for the post-local-buckling strength of steel skin. A compressive strength formula for filled-in concrete accounting for the confining effect of steel skin and strength ratio between filled-in concrete and steel skin is also proposed. The squash loads predicted by the proposed strength formula for the direct strength method were compared with the AISC (2010) and Eurocode4 (2004). The comparison showed that the squash load formula proposed can predict conservatively the squash load of circular and rectangular CFT columns with local buckling

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 899-902
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.899
• Online since: October 2012
• Authors: Young Bong Kwon, In Kyu Jeong, In Kyu Kwon
• Keywords: CFT Section Columns, Diameter-Thickness Ratio, Direct Strength Method, Local Buckling, Squash Loads, Ultimate Strength, Width-Thickness Ratio

References

[1] European Committee for Standardisation (ECS), Eurocode 3: Design of Steel Structures, Part 1-1: General rules and rules for buildings, Brussels, Belgium, 2003.

[2] American Iron Iron and Steel Construction (AISC), AISC 360-05: Specifications for Steel Structural Buildings, Chicago, Il, USA, 2010.

[3] Korean Ministry of Land and Maritime Affairs. Korean Building Codes (KBC), Seoul, Korea, 2005.

[4] Kwon, Y.B., Seo, S. J. and Kang, D. W. (2011) Prediction of the squash loads of concrete-filled tubular section columns with local buckling , Thin-Walled Structures, Vol. 49, No.1, pp.85-93.

DOI: 10.1016/j.tws.2010.08.009