Numerical analysis on fire behaviour of concrete-filled steel tubular columns after lateral impact

Fire often occurs accompanied by explosion or impact, which may cause more severe damage to the structures due to the combined action of different disasters. This study presents a numerical investigation on fire behaviour of concrete-filled steel tubular (CFST) columns after lateral impact damage, a...

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Veröffentlicht in:Engineering structures Jg. 327; S. 119632
Hauptverfasser: Ji, Sun-Hang, Wang, Wen-Da, Shi, Yan-Li, Wang, Jing-Xuan
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 15.03.2025
Schlagworte:
CFST columns
Combined effect
Finite element analysis
Fire resistance
Lateral impact
Simplified methods
Fire resistance
Finite element analysis
CFST columns
Combined effect
Lateral impact
Simplified methods
ISSN:0141-0296
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Zusammenfassung:Fire often occurs accompanied by explosion or impact, which may cause more severe damage to the structures due to the combined action of different disasters. This study presents a numerical investigation on fire behaviour of concrete-filled steel tubular (CFST) columns after lateral impact damage, and the finite element analysis (FEA) model considering the combined action of lateral impact and fire is developed and calibrated. The full-range analysis into fire performance of CFST columns after lateral impact is conducted, namely the impact responses, distribution of internal force and temperature, fire resistance, and stress development. Various parameters affecting the fire resistance of impact-damaged columns are also investigated. The simplified methods are finally proposed for predicting the fire resistance and failure deflection and evaluating the damage of impact-damaged CFST columns. The results indicate that the impact damage significantly reduces the fire resistance of CFST columns and affects the development of failure deflection, which may lead to a more significant sudden destruction of columns in fire. As the impact velocity and weight increase, the fire resistance of CFST columns significantly reduces, while the gap between the residual and failure deflections gradually shortens. A dual adverse effect of the axial load on the fire resistance of impact-damaged CFST columns occurs when the axial load ratio exceeds 0.3. •The FEA model of CFST columns under combined action of impact and fire is developed.•The lateral impact damage significantly reduces the fire resistance of CFST columns.•The deformation sign before column failure in fire shortens as the impact damage worsens.•The failure deflection ratio of columns rises with the increase of the residual angle.
ISSN:0141-0296
DOI:10.1016/j.engstruct.2025.119632