Lateral impact performance of concrete-filled steel tubular (CFST) members after fire

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (4) : 179-187.

JI Sunhang,SHI Yanli,WANG Wenda

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Abstract

The finite element analysis (FEA) model of post-fire concrete-filled steel tube (CFST) members under lateral impact was built to analyze the lateral impact performance of the member after fire, and the accuracy of the model was verified.The time history curves of mid-span deflection, impact force and sectional moment on the post-fire CFST members were compared respectively.The distribution of the moment and shear force of the member was analyzed.The energy absorption capacity (μ) and the post-fire dynamic increase factor of flexural capacity (RT) were used to analyze the impact resistance of the member quantitatively.The formula for predicting the maximum mid-span deflection of the member was proposed.The results show that the fire time has a significant effect on the mid-span deflection, impact duration, impact force and sectional moment of the member.With the increase of fire time, the mid-span deflection greatly increases, the impact duration becomes longer, and the ratio of the ultimate dynamic moment of the steel tube to the concrete increases.The influence of inertia force on the distribution of the moment and shear force is obvious at the peak stage, and the distribution at this stage changes significantly.The failure mode of the member is the overall bending deformation, and the kinetic energy of the drop hammer is mainly dissipated by the overall deformation.The plateau value of impact force, the ultimate sectional dynamic moment, the μ and the RT of the member gradually decrease with the increase of the fire time, indicating that the impact resistance and bending capacity of the member decrease.The maximum deflections calculated by the formula are in good agreement with the simulated values.

Key words

concrete-filled steel tube (CFST) / post-fire / lateral impact / finite element analysis(FEA) / impact resistance

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JI Sunhang,SHI Yanli,WANG Wenda. Lateral impact performance of concrete-filled steel tubular (CFST) members after fire[J]. Journal of Vibration and Shock, 2021, 40(4): 179-187

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