This article presents a modified finite difference method specific for predicting temperatures in concrete-filled steel tubular composite columns. The modifications were based on existing researches on heat transfer analyses of composite columns by finite difference method. The temperature predictions by the modified method were implemented via MATLAB. Validity was established by comparing the predicted temperatures with test results and those obtained from finite element analyses via ABAQUS. The comparisons showed reasonable predictions by the modified finite difference method. Sensitivity studies were also carried out on the effects of emissivity of fire, thermal contact resistance, thermal property model, and cavity ratio based on the modified method. Through the implementation with MATLAB, it is attractive to calculate fire resistance of the concrete-filled steel tubular columns by combining the modified method with the simple calculation models according to Eurocode 4.
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