Calculations on the flexural and axialstiffnesses of steel reinforced concrete members after exposure to fire

TAN Qinghua; ZHOU Kan; HAN Linhai

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (6) : 597-603.

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Calculations on the flexural and axialstiffnesses of steel reinforced concrete members after exposure to fire

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Abstract

The sectional stiffnesses of members after exposure to fire are needed for internal force analyses, so they are a key parameter for post-fire evaluations and seismic analyses. The initial and service flexural and axial stiffnesses were calculated using a finite element analysis (FEA) model for steel reinforced concrete (SRC) columns after exposure to fire to analyze the effects of commonly used parameters. The results of the parametric study show that the heating time, the sectional perimeter and the sectional steel ratio are the main factors affecting the selected stiffness. Simplified formulas for the initial and service flexural and axial stiffnesses after a fire were then developed for mechanical analyses of SRC structures after exposure to fire.

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steel reinforced concrete / post-fire / flexural stiffness / axial stiffness

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TAN Qinghua, ZHOU Kan, HAN Linhai. Calculations on the flexural and axialstiffnesses of steel reinforced concrete members after exposure to fire[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(6): 597-603

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