Addis Ababa Institute of Technology

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Browsing Addis Ababa Institute of Technology by Subject "3-D finite element model"

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    Fire Resistance of Concrete Filled Steel Tube Column under Axial Load
    (Addis Ababa University, 2021-05) Bereket, Adamu; Bedilu, Habte (PhD)
    Concrete-filled steel tube (CFST) structural sections are an effective, sustainable and attractive option in multi-story buildings and are becoming increasingly common in modern construction practice around the world. Whilst the analysis and design of these elements at ambient temperatures is well understood but their response to higher temperatures is still under study. This paper concerns to analyze the effect of different parameters on the fire resistance of the CFST column under axial load. The research is conducted using non-linear finite element analysis software (ABAQUS 2020). Latin Hypercube Sampling (LHS) technique is applied to see the effect of five parameters: Diameter to steel tube thickness ratio (D/t), compressive strength of concrete (fc), load ratio (n), the yield stress of steel (fy), and slenderness ratio (λ) on the axial deformation and fire resistance of CFST column. The effect of cross-sectional shape and support conditions is also investigated. From this analysis, it was found that the load ratio, slenderness ratio, and diameter to thickness ratio have a moderate effect on the result of fire resistance and axial deformation. Among these, the slenderness ratio is the most influential parameter on fire resistance and axial deformation determination. Whereas, from the case of support condition, Fixed-Fixed supported CFST columns have higher fire resistance than pinned-fixed supported CFST columns.