Abstract
This paper establishes a finite element (FE) model for the fire resistance analysis of concrete-filled steel tubular (CFST) columns with circular cross section. The model is validated by experimental results from a database consisted of 123 fire tests on circular CFST columns. The critical temperature is clarified for the circular CFST column exposed to standard fire. The performance of circular CFST columns is discussed and extensive parametric study is performed by the FE model. The equation for the critical temperature of circular CFST columns to axial compression is proposed and compared with both FE and test results. The results show that the established FE model well captures the behaviour of CFST column exposed to standard fire, and the proposed critical temperature calculation method provides more accurate fire resistance predictions than methods in current codes of practice.
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