Experimental Study on the Influence of Boundary Condition on the Behavioral Characteristics of CFT Square Columns under Constant Axial Load upon a Fire

Abstract:

The temperature of the steel tube of a CFT column rises rapidly upon a fire causing the deterioration of its strength, while the concrete inside of the tube having large heat capacity provides fire-resistance performance. In order to employ CFT columns as fire-resistant structure, it is necessary to conduct studies on the factors exerting influence on structural capacities and the influence associated with each condition. Concrete’s compressive strength, cross-section size, axial load ratio and boundary condition are the major factors which are influential in fire-resistance performance. In particular, boundary condition between columns and beams is one of the major factors which decide fire-resistance performance because it exerts influence on load carrying capacity. The result of the test conducted in this study showed that fire-resistance time of 106 minutes was secured in the specimens with clamped ends and that of 89 minutes in those with pinned ends when cross-section size was 360mm by 360mm. In the specimens with cross-section size of 280 mm × 280mm, fire-resistance time of 113 minutes was secured under the condition of clamped ends and that of 78 minutes was secured under the condition of pinned ends.

• Periodical: Applied Mechanics and Materials (Volume 82)
• Pages: 521-526
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.82.521
• Online since: July 2011
• Authors: Heung Youl Kim, Kyung Hoon Park, Ki Hyuk Kwon
• Keywords: Boundary Condition, CFT Columns, Fire Behaviour, Fire Resistant, Structure

References

[1] Ministry of Land, Transport & Maritime Affairs (2009), "Development of fire-resistance design technology for CFT structure – Final report of the 3rd year", Korea Institute of Construction & Transportation Technology Evaluation & Planning, pp.114-159.

[2] Liang Q.Q, and Uy B (1998). "Parametric study on the structural behaviour of steel plates in concrete-filled fabricated thin-walled box columns". Advances in Structural Engineering, 2(1), 57-71.

DOI: 10.1177/136943329800200108

[3] L.H. Han, Y.F. Yang, Lei Xu, (2003), An experimental study and calculation on the fire resistance of concrete-filled SHS and RHS columns, J. Constr. Steel Research 59, pp.427-452.

DOI: 10.1016/s0143-974x(02)00041-x

[4] Liang Q.Q., Uy B., and Liew, R. (2006), "Nonlinear analysis of concrete-filled thin - walled steel box columns with local buckling effects". Journal of construction steel research, 62, 581-591

DOI: 10.1016/j.jcsr.2005.09.007

[5] Liang Q.Q., Uy B. (2000). "Theoretical study on the post-local buckling of steel plates in concrete-filled box columns". Computers and Structures, 75(5), 479-490.

DOI: 10.1016/s0045-7949(99)00104-2

[6] Lie T.T., Structural fire protection. Manuals and reports on engineering practice, vol. 78. New York (NY): ASCE; 1992.

[7] Lie, T.T., Irwin, R.J. (1995) Fire resistance of rectangular steel columns filled with bar-reinforced concrete, Journal of Structural Engineering, ASCE, pp.797-805.

DOI: 10.1061/(asce)0733-9445(1995)121:5(797)

[8] Lin-Hai Han, Xiao-Ling Zhao, M.ASCE, You-Fu Yang and Jiu-Bin Feng. (2003) Experimental Study and Calculation of Fire Resistance of Concrete-Filled Hollow Steel Columns, Journal of Structural Engineering, pp.346-355.

DOI: 10.1061/(asce)0733-9445(2003)129:3(346)