Advanced Steel Construction

Vol. 12, No. 1, pp. 32-43 (2016)




Ruolin Wang 1 , Chao Zhang 2,* and Guo-qiang Li 3

1 School of Civil Engineering, Wuhan University, Wuhan, China, 430072

2 College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China

3 Sate Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, China

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

Received: 5 August 2014; Revised: 1 January 2015; Accepted: 19 March 2015




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The usage of concrete filled steel tubular (CFT) columns in large space buildings is increasing. Flashover is unlikely to happen in a large enclosure and the localized fire model is preferable to model the fire environment in a large enclosure fire. This paper proposed a simple approach to evaluate the fire resistance of circular CFT columns in localized fires. Simple model was provided to calculate the column temperatures in a localized fire. The concept of equivalent fire severity or time equivalent was used to correlate the localized fires with the standard fire. The simple model used in the Chinese code was used to calculate the load capacity of the circular CFT columns subjected to the equivalent standard fire exposure. The proposed approach, by correlating real fires with the standard fire, only includes heat transfer analysis and avoids the complex structural analysis, which provides an easy and efficient way for performance-based fire safety design. A case study is also provided to demonstrate the application of the approach.



Concrete filled steel tubular (CFT) columns, Fire resistance, Large enclosure, Localized fires, Simple method, Time equivalent, Performance-based design


[1] Han, L.H., Zhao, X.L., Yang, Y.F. and Feng, J.B., “Experimental Study and Calculation of Fire Resistance of Concrete-filled Hollow Steel Columns”, Journal of Structural Engineering - ASCE, 2003, Vol. 129, pp. 346-56.

[2] Lie, T.T. and Chabot, M., “A Method to Predict the Fire Resistance of Circular Concrete Filled Hollow Steel Columns. Journal of Fire Protection Engineering, 1990, Vol. 2, pp. 111-26.

[3] EC4-1-2. Eurocode 4 – Design of Composite Steel and Concrete Structures – Part 1-2: General Rules – Structural Fire Design. British Standards, 2005.

[4] Kodur, V.K.R., “Performance-based Fire Resistance Design of Concrete-filled Steel Columns”, Journal of Constructional Steel Research, 1999, Vol. 51, pp. 21-36.

[5] Espinos, A., Romero, M.L. and Hospitaler, A., “Simple Calculation Model for Evaluating the Fire Resistance of Unreinforced Concrete Filled Tubular Columns”, Engineering Structures, 2012, Vol. 42, pp. 231-44.

[6] China Association for Engineering Construction Standardization (CECS200), Technical Code for Fire Safety of Steel Structure in Buildings (in Chinese), Beijing, China Planning Press, 2006.

[7] Li, G.Q. and Zhang, C., “The Chinese Performance-based Code for Fire-resistance of Steel Structures”, International Journal of High-Rise Buildings, 2013, Vol. 2, pp. 123-30.

[8] Zhang, C. and Li, G.Q., “Modified One Zone Model for Fire Resistance Design of Steel Structures”, Advanced Steel Construction, 2013, Vol. 9, pp. 284-99.

[9] Drysdale, D., “An Introduction to Fire Dynamics, 2nd edition, John Wiley and Sons, 1999.

[10] Zhang, C., and Li, G.Q., “Fire Dynamic Simulation on Thermal Actions in Localized Fires in Large Enclosure”, Advanced Steel Construction, 2012, Vol. 8, pp. 124-36.

[11] EC1-1-2. Eurocode 1: Actions on Structures – Part 1-2: General Rules – Actions on Structures Exposed to Fire, British Standards, 2002.

[12] Quintiere, J.G. and Grove, B.S., “A Unified Analysis for Fire Plumes”, 27th Symposium (International) on Combustion, The Combustion Institute, 1998, pp. 2757-66.

[13] Zhang, C., and Li, G.Q., Simple Formulae for Calculating the Gas Temperature in Large Enclosure Fire Environment”, Fire Safety Science, 2012, pp. 2175-82. (In Chinese)

[14] Li, G.Q. and Zhang, C., “Simple Approach for Calculating Maximum Temperature of Insulated Steel Memebrs in Natural-fires”, Journal of Constructional Steel Research, 2012, Vol. 71, pp. 404-10.

[15] Zhang, C., Li, G.Q. and Usmani, A., “Simulating the Behavior of Restrained Steel Beams to Flame Impingement from Localized-fires”, Journal of Constructional Steel Research, 2013, Vol. 83, pp. 156-65.

[16] Zhang, C., Gross, J.L. and McAllister, T.P., “Lateral Torsional Buckling of Steel W-beams Subjected to Localized Fires”, Journal of Constructional Steel Research, 2013, Vol. 88, pp.330-8.

[17] Zhang, C., Gross, J.L., McAllister, T.P. and Li, G.Q., “Behavior of Unrestrained and Restrained Bare Steel Columns Subjected to Localized Fire”, Journal of Structural Engineering –ASCE, 2014. Doi: 10.1061/(asce)st.1943-541X.0001225

[18] Li, G.Q. and Zhang, C., “Thermal Response to Fire of Uniformly Insulated Steel Members: Background and Verification of the Formulation Recommended by Chinese Code CECS200”, Advanced Steel Construction, 2010, Vol. 6, pp. 788-802.

[19] Zhang, C., Li, G.Q. and Wang, Y.C., “Sensitivity Study on Using Different Formulae for Calculating the Temperature of Insulated Steel Members in Natural Fires”, Fire Technology, 2012, Vol. 48, pp. 343-66.

[20] Zhang, C. and Usmani, A., “Heat Transfer Principles in Thermal Calculation of Structures in Fire”, Fire Safety Journal, 2015, Vol.78, pp. 85-95.

[21] Buchanan, A.H., “Structural Design for Fire Safety”, John Wiley and Sons Ltd., 2002.

[22] Rush, D., Bisby, L. and Jowsey, A., “Evaluating Design Guidance for Intumescent Fire Protection of Concrete Filled Steel Hollow Sections”, Proceedings of the 8th International Conference on Structures in Fire (SiF’14), Shanghai, China, June 2014, pp.1071-8.