Advanced Steel Construction

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

Simple Approach for Performance-based Fire Safety Design of Circular CFT Columns in Lage Enclosure


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





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.


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


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