Cooling behavior and residual strength of post-fire concrete filled steel tubular columns

摘要: Abstract An interaction approach to evaluate the residual strength of concrete filled steel tubular (CFST) columns after fire conditions is developed. The based on reduction tube and as a function maximum temperature, which obtained from whole exposure process. Sixty-one CFST column tests specimens subjected uniform heating or ISO-834 standard were employed benchmark proposed approach. predictions showed good agreement compared with experimental data. In order obtain post-fire load versus deformation relationships, 3D finite element model was developed investigate behavior under different conditions. Based natural curve Cardington Fire Dynamics Simulator (FDS) software, parametric studies performed effects parameters From theoretical computational analysis, it can be concluded that generally affected by duration time, cross-sectional diameter slenderness ratio.